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New ES2018 Features Every JavaScript Developer Should Know
The ninth edition of the ECMAScript standard, officially known as ECMAScript 2018 (or ES2018 for short), was released in June 2018. Starting with ES2016, new versions of ECMAScript specifications are released yearly rather than every several years and add fewer features than major editions used to. The newest edition of the standard continues the yearly release cycle by adding four new RegExp features, rest/spread properties, asynchronous iteration, and Promise.prototype.finally. Additionally, ES2018 drops the syntax restriction of escape sequences from tagged templates.
These new changes are explained in the subsections that follow.
The Rest/Spread Properties
One of the most interesting features added to ES2015 was the spread operator. This operator makes copying and merging arrays a lot simpler. Rather than calling the concat() or slice() method, you could use the … operator:
const arr1 = [10, 20, 30];
// make a copy of arr1
const copy = [...arr1];
console.log(copy); // → [10, 20, 30]
const arr2 = [40, 50];
// merge arr2 with arr1
const merge = [...arr1, ...arr2];
console.log(merge); // → [10, 20, 30, 40, 50]
The spread operator also comes in handy in situations where an array must be passed in as separate arguments to a function. For example:
const arr = [10, 20, 30]
// equivalent to
// console.log(Math.max(10, 20, 30));
console.log(Math.max(...arr)); // → 30
ES2018 further expands this syntax by adding spread properties to object literals. With the spread properties you can copy own enumerable properties of an object onto a new object. Consider the following example:
const obj1 = {
a: 10,
b: 20
};
const obj2 = {
...obj1,
c: 30
};
console.log(obj2); // → {a: 10, b: 20, c: 30}
In this code, the … operator is used to retrieve the properties of obj1 and assign them to obj2. Prior to ES2018, attempting to do so would throw an error. If there are multiple properties with the same name, the property that comes last will be used:
const obj1 = {
a: 10,
b: 20
};
const obj2 = {
...obj1,
a: 30
};
console.log(obj2); // → {a: 30, b: 20}
Spread properties also provide a new way to merge two or more objects, which can be used as an alternative to the Object.assign() method:
const obj1 = {a: 10};
const obj2 = {b: 20};
const obj3 = {c: 30};
// ES2018
console.log({...obj1, ...obj2, ...obj3}); // → {a: 10, b: 20, c: 30}
// ES2015
console.log(Object.assign({}, obj1, obj2, obj3)); // → {a: 10, b: 20, c: 30}
Note, however, that spread properties do not always produce the same result as Object.assign(). Consider the following code:
Object.defineProperty(Object.prototype, 'a', {
set(value) {
console.log('set called!');
}
});
const obj = {a: 10};
console.log({...obj});
// → {a: 10}
console.log(Object.assign({}, obj));
// → set called!
// → {}
In this code, the Object.assign() method executes the inherited setter property. Conversely, the spread properties simply ignore the setter.
It’s important to remember that spread properties only copy enumerable properties. In the following example, the type property won’t show up in the copied object because its enumerable attribute is set to false:
const car = {
color: 'blue'
};
Object.defineProperty(car, 'type', {
value: 'coupe',
enumerable: false
});
console.log({...car}); // → {color: "blue"}
Inherited properties are ignored even if they are enumerable:
const car = {
color: 'blue'
};
const car2 = Object.create(car, {
type: {
value: 'coupe',
enumerable: true,
}
});
console.log(car2.color); // → blue
console.log(car2.hasOwnProperty('color')); // → false
console.log(car2.type); // → coupe
console.log(car2.hasOwnProperty('type')); // → true
console.log({...car2}); // → {type: "coupe"}
In this code, car2 inherits the color property from car. Because spread properties only copy the own properties of an object, color is not included in the return value.
Keep in mind that spread properties can only make a shallow copy of an object. If a property holds an object, only the reference to the object will be copied:
const obj = {x: {y: 10}};
const copy1 = {...obj};
const copy2 = {...obj};
console.log(copy1.x === copy2.x); // → true
The x property in copy1 refers to the same object in memory that x in copy2 refers to, so the strict equality operator returns true.
Another useful feature added to ES2015 was rest parameters, which enabled JavaScript programmers to use … to represent values as an array. For example:
const arr = [10, 20, 30];
const [x, ...rest] = arr;
console.log(x); // → 10
console.log(rest); // → [20, 30]
Here, the first item in arr is assigned to x, and remaining elements are assigned to the rest variable. This pattern, called array destructuring, became so popular that the Ecma Technical Committee decided to bring a similar functionality to objects:
const obj = {
a: 10,
b: 20,
c: 30
};
const {a, ...rest} = obj;
console.log(a); // → 10
console.log(rest); // → {b: 20, c: 30}
This code uses the rest properties in a destructuring assignment to copy the remaining own enumerable properties into a new object. Note that rest properties must always appear at the end of the object, otherwise an error is thrown:
const obj = {
a: 10,
b: 20,
c: 30
};
const {...rest, a} = obj; // → SyntaxError: Rest element must be last element
Also keep in mind that using multiple rest syntaxes in an object causes an error, unless they are nested:
const obj = {
a: 10,
b: {
x: 20,
y: 30,
z: 40
}
};
const {b: {x, ...rest1}, ...rest2} = obj; // no error
const {...rest, ...rest2} = obj; // → SyntaxError: Rest element must be last element
Support for Rest/Spread Properties
Chrome Firefox Safari Edge 60 55 11.1 No Chrome Android Firefox Android iOS Safari Edge Mobile Samsung Internet Android Webview 60 55 11.3 No 8.2 60 Node.js:
- 8.0.0 (requires the --harmony runtime flag)
- 8.3.0 (full support)
Asynchronous Iteration
Iterating over a collection of data is an important part of programming. Prior to ES2015, JavaScript provided statements such as for, for…in, and while, and methods such as map(), filter(), and forEach() for this purpose. To enable programmers to process the elements in a collection one at a time, ES2015 introduced the iterator interface.
An object is iterable if it has a Symbol.iterator property. In ES2015, strings and collections objects such as Set, Map, and Array come with a Symbol.iterator property and thus are iterable. The following code gives an example of how to access the elements of an iterable one at a time:
const arr = [10, 20, 30];
const iterator = arr[Symbol.iterator]();
console.log(iterator.next()); // → {value: 10, done: false}
console.log(iterator.next()); // → {value: 20, done: false}
console.log(iterator.next()); // → {value: 30, done: false}
console.log(iterator.next()); // → {value: undefined, done: true}
Symbol.iterator is a well-known symbol specifying a function that returns an iterator. The primary way to interact with an iterator is the next() method. This method returns an object with two properties: value and done. The value property contains the value of the next element in the collection. The done property contains either true or false denoting whether or not the end of the collection has reached.
By default, a plain object is not iterable, but it can become iterable if you define a Symbol.iterator property on it, as in this example:
const collection = {
a: 10,
b: 20,
c: 30,
[Symbol.iterator]() {
const values = Object.keys(this);
let i = 0;
return {
next: () => {
return {
value: this[values[i++]],
done: i > values.length
}
}
};
}
};
const iterator = collection[Symbol.iterator]();
console.log(iterator.next()); // → {value: 10, done: false}
console.log(iterator.next()); // → {value: 20, done: false}
console.log(iterator.next()); // → {value: 30, done: false}
console.log(iterator.next()); // → {value: undefined, done: true}
This object is iterable because it defines a Symbol.iterator property. The iterator uses the Object.keys() method to get an array of the object’s property names and then assigns it to the values constant. It also defines a counter variable and gives it an initial value of 0. When the iterator is executed it returns an object that contains a next() method. Each time the next() method is called, it returns a {value, done} pair, with value holding the next element in the collection and done holding a Boolean indicating if the iterator has reached the need of the collection.
While this code works perfectly, it’s unnecessarily complicated. Fortunately, using a generator function can considerably simplify the process:
const collection = {
a: 10,
b: 20,
c: 30,
[Symbol.iterator]: function * () {
for (let key in this) {
yield this[key];
}
}
};
const iterator = collection[Symbol.iterator]();
console.log(iterator.next()); // → {value: 10, done: false}
console.log(iterator.next()); // → {value: 20, done: false}
console.log(iterator.next()); // → {value: 30, done: false}
console.log(iterator.next()); // → {value: undefined, done: true}
Inside this generator, a for…in loop is used to enumerate over the collection and yield the value of each property. The result is exactly the same as the previous example, but it’s greatly shorter.
A downside of iterators is that they are not suitable for representing asynchronous data sources. ES2018’s solution to remedy that is asynchronous iterators and asynchronous iterables. An asynchronous iterator differs from a conventional iterator in that, instead of returning a plain object in the form of {value, done}, it returns a promise that fulfills to {value, done}. An asynchronous iterable defines a Symbol.asyncIterator method (instead of Symbol.iterator) that returns an asynchronous iterator.
An example should make this clearer:
const collection = {
a: 10,
b: 20,
c: 30,
[Symbol.asyncIterator]() {
const values = Object.keys(this);
let i = 0;
return {
next: () => {
return Promise.resolve({
value: this[values[i++]],
done: i > values.length
});
}
};
}
};
const iterator = collection[Symbol.asyncIterator]();
console.log(iterator.next().then(result => {
console.log(result); // → {value: 10, done: false}
}));
console.log(iterator.next().then(result => {
console.log(result); // → {value: 20, done: false}
}));
console.log(iterator.next().then(result => {
console.log(result); // → {value: 30, done: false}
}));
console.log(iterator.next().then(result => {
console.log(result); // → {value: undefined, done: true}
}));
Note that it’s not possible to use an iterator of promises to achieve the same result. Although a normal, synchronous iterator can asynchronously determine the values, it still needs to determine the state of “done” synchronously.
Again, you can simplify the process by using a generator function, as shown below:
const collection = {
a: 10,
b: 20,
c: 30,
[Symbol.asyncIterator]: async function * () {
for (let key in this) {
yield this[key];
}
}
};
const iterator = collection[Symbol.asyncIterator]();
console.log(iterator.next().then(result => {
console.log(result); // → {value: 10, done: false}
}));
console.log(iterator.next().then(result => {
console.log(result); // → {value: 20, done: false}
}));
console.log(iterator.next().then(result => {
console.log(result); // → {value: 30, done: false}
}));
console.log(iterator.next().then(result => {
console.log(result); // → {value: undefined, done: true}
}));
Normally, a generator function returns a generator object with a next() method. When next() is called it returns a {value, done} pair whose value property holds the yielded value. An async generator does the same thing except that it returns a promise that fulfills to {value, done}.
An easy way to iterate over an iterable object is to use the for…of statement, but for…of doesn’t work with async iterables as value and done are not determined synchronously. For this reason, ES2018 provides the for…await…of statement. Let’s look at an example:
const collection = {
a: 10,
b: 20,
c: 30,
[Symbol.asyncIterator]: async function * () {
for (let key in this) {
yield this[key];
}
}
};
(async function () {
for await (const x of collection) {
console.log(x);
}
})();
// logs:
// → 10
// → 20
// → 30
In this code, the for…await…of statement implicitly calls the Symbol.asyncIterator method on the collection object to get an async iterator. Each time through the loop, the next() method of the iterator is called, which returns a promise. Once the promise is resolved, the value property of the resulting object is read to the x variable. The loop continues until the done property of the returned object has a value of true.
Keep in mind that the for…await…of statement is only valid within async generators and async functions. Violating this rule results in a SyntaxError.
The next() method may return a promise that rejects. To gracefully handle a rejected promise, you can wrap the for…await…of statement in a try…catch statement, like this:
const collection = {
[Symbol.asyncIterator]() {
return {
next: () => {
return Promise.reject(new Error('Something went wrong.'))
}
};
}
};
(async function() {
try {
for await (const value of collection) {}
} catch (error) {
console.log('Caught: ' + error.message);
}
})();
// logs:
// → Caught: Something went wrong.
Support for Asynchronous Iterators
Chrome Firefox Safari Edge 63 57 12 No Chrome Android Firefox Android iOS Safari Edge Mobile Samsung Internet Android Webview 63 57 12 No 8.2 63 Node.js:
- 8.0.0 (requires the --harmony runtime flag)
- 8.3.0 (full support)
Promise.prototype.finally
Another exciting addition to ES2018 is the finally() method. Several JavaScript libraries had previously implemented a similar method, which proved useful in many situations. This encouraged the Ecma Technical Committee to officially add finally() to the specification. With this method, programmers will be able to execute a block of code regardless of the promise’s fate. Let’s look at a simple example:
fetch('https://www.google.com')
.then((response) => {
console.log(response.status);
})
.catch((error) => {
console.log(error);
})
.finally(() => {
document.querySelector('#spinner').style.display = 'none';
});
The finally() method comes in handy when you need to do some clean up after the operation has finished regardless of whether or not it succeeded. In this code, the finally() method simply hides the loading spinner after the data is fetched and processed. Instead of duplicating the final logic in the then() and catch() methods, the code registers a function to be executed once the promise is either fulfilled or rejected.
You could achieve the same result by using promise.then(func, func) rather than promise.finally(func), but you would have to repeat the same code in both fulfillment handler and rejection handler, or declare a variable for it:
fetch('https://www.google.com')
.then((response) => {
console.log(response.status);
})
.catch((error) => {
console.log(error);
})
.then(final, final);
function final() {
document.querySelector('#spinner').style.display = 'none';
}
As with then() and catch(), the finally() method always returns a promise, so you can chain more methods. Normally, you want to use finally() as the last chain, but in certain situations, such as when making a HTTP request, it’s a good practice to chain another catch() to deal with errors that may occur in finally().
Support for Promise.prototype.finally
Chrome Firefox Safari Edge 63 58 11.1 18 Chrome Android Firefox Android iOS Safari Edge Mobile Samsung Internet Android Webview 63 58 11.1 No 8.2 63 Node.js:
10.0.0 (full support)
New RegExp Features
ES2018 adds four new features to the RegExp object, which further improves JavaScript’s string processing capabilities. These features are as follows:
- 8.0.0 (requires the --harmony runtime flag)
- 8.3.0 (full support)
s (dotAll) Flag
The dot (.) is a special character in a regular expression pattern that matches any character except line break characters such as line feed (\n) or carriage return (\r). A workaround to match all characters including line breaks is to use a character class with two opposite shorthands such as [\d\D]. This character class tells the regular expression engine to find a character that’s either a digit (\d) or a non-digit (\D). As a result, it matches any character:
console.log(/one[\d\D]two/.test('one\ntwo')); // → true
ES2018 introduces a mode in which the dot can be used to achieve the same result. This mode can be activated on per-regex basis by using the s flag:
console.log(/one.two/.test('one\ntwo')); // → false
console.log(/one.two/s.test('one\ntwo')); // → true
The benefit of using a flag to opt in to the new behavior is backwards compatibility. So existing regular expression patterns that use the dot character are not affected.
Named Capture Groups
In some regular expression patterns, using a number to reference a capture group can be confusing. For example, take the regular expression /(\d{4})-(\d{2})-(\d{2})/ which matches a date. Because date notation in American English is different from British English, it’s hard to know which group refers to the day and which group refers to the month:
const re = /(\d{4})-(\d{2})-(\d{2})/;
const match= re.exec('2019-01-10');
console.log(match[0]); // → 2019-01-10
console.log(match[1]); // → 2019
console.log(match[2]); // → 01
console.log(match[3]); // → 10
ES2018 introduces named capture groups which uses the (?…) syntax. So, the pattern to match a date can be written in a less ambiguous manner:
const re = /(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})/;
const match = re.exec('2019-01-10');
console.log(match.groups); // → {year: "2019", month: "01", day: "10"}
console.log(match.groups.year); // → 2019
console.log(match.groups.month); // → 01
console.log(match.groups.day); // → 10
You can recall a named capture group later in the pattern by using the \k syntax. For example, to find consecutive duplicate words in a sentence, you can use /\b(?\w+)\s+\k\b/:
const re = /\b(?<dup>\w+)\s+\k<dup>\b/;
const match = re.exec('Get that that cat off the table!');
console.log(match.index); // → 4
console.log(match[0]); // → that that
To insert a named capture group into the replacement string of the replace() method, you will need to use the $ construct. For example:
const str = 'red & blue';
console.log(str.replace(/(red) & (blue)/, '$2 & $1'));
// → blue & red
console.log(str.replace(/(?<red>red) & (?<blue>blue)/, '$<blue> & $<red>'));
// → blue & red
Lookbehind Assertions
ES2018 brings lookbehind assertions to JavaScript, which have been available in other regex implementations for years. Previously, JavaScript only supported lookahead assertions. A lookbehind assertion is denoted by (?<=…), and enables you to match a pattern based on the substring that precedes the pattern. For example, if you want to match the price of a product in dollar, pound, or euro without capturing the currency symbol, you can use /(?<=$|£|€)\d+(.\d*)?/:
const re = /(?<=\$|£|€)\d+(\.\d*)?/;
console.log(re.exec('199'));
// → null
console.log(re.exec('$199'));
// → ["199", undefined, index: 1, input: "$199", groups: undefined]
console.log(re.exec('€50'));
// → ["50", undefined, index: 1, input: "€50", groups: undefined]
There is also a negative version of lookbehind, which is denoted by (?<!..). A negative lookbehind allows you to match a pattern only if it is not preceded by the pattern within the lookbehind. For example, the pattern /(?<!un)available/ matches the word available if it does not have a “un” prefix:
const re = /(?<!un)available/;
console.log(re.exec('We regret this service is currently unavailable'));
// → null
console.log(re.exec('The service is available'));
// → ["available", index: 15, input: "The service is available", groups: undefined]
Unicode Property Escapes
ES2018 provides a new type of escape sequence known as Unicode property escape, which provides support for full Unicode in regular expressions. Suppose you want to match the Unicode character ㉛ in a string. Although ㉛ is considered a number, you can’t match it with the \d shorthand character class because it only supports ASCII [0-9] characters. Unicode property escapes, on the other hand, can be used to match any decimal number in Unicode:
const str = '㉛';
console.log(/\d/u.test(str)); // → false
console.log(/\p{Number}/u.test(str)); // → true
Similarly, if you want to match any Unicode word alphabetic character, you can use \p{Alphabetic}:
const str = 'ض';
console.log(/\p{Alphabetic}/u.test(str)); // → true
// the \w shorthand cannot match ض
console.log(/\w/u.test(str)); // → false
There is also a negated version of \p{…}, which is denoted by \P{…}:
console.log(/\P{Number}/u.test('㉛')); // → false
console.log(/\P{Number}/u.test('ض')); // → true
console.log(/\P{Alphabetic}/u.test('㉛')); // → true
console.log(/\P{Alphabetic}/u.test('ض')); // → false
In addition to Alphabetic and Number, there are several more properties that can be used in Unicode property escapes. You can find a list of supported Unicode properties in the current specification proposal.
Support for New RegExp Features
Chrome Firefox Safari Edge s (dotAll) Flag 62 No 11.1 No Named Capture Groups 64 No 11.1 No Lookbehind Assertions 62 No No No Unicode Property Escapes 64 No 11.1 No Chrome (Android) Firefox (Android) iOS Safari Edge Mobile Samsung Internet Android Webview s (dotAll) Flag 62 No 11.3 No 8.2 62 Named Capture Groups 64 No 11.3 No No 64 Lookbehind Assertions 62 No No No 8.2 62 Unicode Property Escapes 64 No 11.3 No No 64 **Node.js:**
- 8.0.0 (requires the --harmony runtime flag)
- 8.3.0 (full support)
Template Literal Revision
When a template literal is immediately preceded by an expression, it is called a tagged template literal. A tagged template comes in handy when you want to parse a template literal with a function. Consider the following example:
function fn(string, substitute) {
if(substitute === 'ES6') {
substitute = 'ES2015'
}
return substitute + string[1];
}
const version = 'ES6';
const result = fn`${version} was a major update`;
console.log(result); // → ES2015 was a major update
In this code, a tag expression — which is a regular function — is invoked and passed the template literal. The function simply modifies the dynamic part of the string and returns it.
Prior to ES2018, tagged template literals had syntactic restrictions related to escape sequences. A backslash followed by certain sequence of characters were treated as special characters: a \x interpreted as a hex escape, a \u interpreted as a unicode escape, and a \ followed by a digit interpreted as an octal escape. As a result, strings such as “C:\xxx\uuu” or “\ubuntu” were considered invalid escape sequences by the interpreter and would throw a SyntaxError.
ES2018 removes these restrictions from tagged templates and instead of throwing an error, represents invalid escape sequences as undefined:
function fn(string, substitute) {
console.log(substitute); // → escape sequences:
console.log(string[1]); // → undefined
}
const str = 'escape sequences:';
const result = fn`${str} \ubuntu C:\xxx\uuu`;
Keep in mind that using illegal escape sequences in a regular template literal still causes an error:
const result = `\ubuntu`;
// → SyntaxError: Invalid Unicode escape sequence
Support for Template Literal Revision
Chrome Firefox Safari Edge 62 56 11 No Chrome Android Firefox Android iOS Safari Edge Mobile Samsung Internet Android Webview 62 56 11 No 8.2 62 Node.js:
- 8.0.0 (requires the --harmony runtime flag)
- 8.3.0 (full support)
Wrapping up
We’ve taken a good look at several key features introduced in ES2018 including asynchronous iteration, rest/spread properties, Promise.prototype.finally(), and additions to the RegExp object. Although some of these features are not fully implemented by some browser vendors yet, they can still be used today thanks to JavaScript transpilers such as Babel.
ECMAScript is rapidly evolving and new features are being introduced every so often, so check out the list of finished proposals for the full scope of what’s new. Are there any new features you’re particularly excited about? Share them in the comments!
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Website: https://www.appcluesinfotech.com/
2. Data EximIT
Data EximIT is one of the leading mobile app development company in New York that provides top-notch and elegant mobile app development services with the latest market trends and functionalities at a competitive price. They have highly experienced mobile app designers and developers team who have the best strength of developing all types of a mobile app. They deliver a feature-rich mobile app for their clients that give the best business ROI.
Founded In: 2004
Employees: 50 to 150 Members
Location: USA & India
Website: https://www.dataeximit.com/
3. WebClues Infotech
WebClues Infotech is the most reliable & superior company that builds custom mobile apps to do things differently. They are the best mobile app development company in New York, USA and as well as globally with high proficiency. They have a highly experienced app developers team that has the best strength of work on multiple platforms like android, Cross-platform, and iOS.
They have successfully delivered 950+ mobile app projects effectively and on-time. Build your Robust, Secure, Scalable & High-performance mobile app with WebClues Infotech with creative & dynamic designs at an affordable price.
Founded In: 2014
Employees: 50 to 250 Members
Location: USA, INDIA, UAE, UK & CANADA
Website: https://www.webcluesinfotech.com/
4. AppClues Studio
AppClues Studio is a leading mobile app development company in New York, USA. The company is versatile in developing custom mobile app development solutions to its customers across the globe. With an experience of 8+ years in mobile app development, Utility is hyper-focused on Return on Investment (ROI) and building good relationships with partner companies. The company is worked with a start-up to large enterprises.
Founded In: 2014
Employees: 50 to 150 Members
Location: USA & UK
Website: https://appcluesstudio.com/
5. WebClues Global
WebClues Global is a prominent mobile application development company in New York, USA. They are one of the top-tier mobile app developers who deliver high-end Android mobile app solutions to their clients. The company operated with 100+ qualified developers who working in different domains to give the best solution for their development. WebClues Global offers various services including web and mobile design & development, E-Commerce Development, Ui/Ux Development.
Founded In: 2014
Employees: 50 to 150 Members
Location: USA, INDIA, UAE, UK & CANADA
Website: https://www.webcluesglobal.com/
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Best App Development Companies in New York
Are you looking for a top mobile app development company in New York? Please find a list of the Best App Development Companies in New York that help to build high-quality, Robust, high-performance mobile app with advanced technology and features at an affordable price.
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