Eve  Klocko

Eve Klocko

1594655850

JavaScript spread operator: To infinity and beyond!

Three dots can make a huge difference in a sentence. In JavaScript, this is not the exception. In JavaScript, the spread operator is identified by using three dots. This syntax is very powerful because it allows you to perform plenty of different tasks in a very simple and easy way.

Let’s go over some examples of how to use this syntax on JavaScript.

Passing arrays as arguments

The spread operator lets you grab an array, and decompose it in such a way that now you can have each one of the values out of it and can be passed as arguments to a function.

Let’s start by assuming you have the following code. A function that takes in three arguments and logs them separated by commas and an array with three elements.

const fun = (a, b, c) => console.log(`${a}, ${b}, ${c}`);
const arr = [0, 1, 2];

You could do this in a simple but not ideal way. This is, to take each one of the elements out of the array by their indexes and passing them as arguments.

const fun = (a, b, c) => console.log(`${a}, ${b}, ${c}`);
const arr = [0, 1, 2];

fun(arr[0], arr[1], arr[2]);

#javascript-development #typescript #javascript #arrays #software-development

What is GEEK

Buddha Community

JavaScript spread operator: To infinity and beyond!

Santosh J

1622036598

JavaScript compound assignment operators

JavaScript is unarguablly one of the most common things you’ll learn when you start programming for the web. Here’s a small post on JavaScript compound assignment operators and how we use them.

The compound assignment operators consist of a binary operator and the simple assignment operator.

The binary operators, work with two operands. For example a+b where + is the operator and the a, b are operands. Simple assignment operator is used to assign values to a variable(s).

It’s quite common to modify values stored in variables. To make this process a little quicker, we use compound assignment operators.

They are:

  • +=
  • -+
  • *=
  • /=

You can also check my video tutorial compound assignment operators.

Let’s consider an example. Suppose price = 5 and we want to add ten more to it.

var price = 5;
price = price + 10;

We added ten to price. Look at the repetitive price variable. We could easily use a compound += to reduce this. We do this instead.

price += 5;

Awesome. Isn’t it? What’s the value of price now? Practice and comment below. If you don’t know how to practice check these lessons.

Lets bring down the price by 5 again and display it.
We use console.log command to display what is stored in the variable. It is very help for debugging.
Debugging let’s you find errors or bugs in your code. More on this later.

price -= 5;
console.log(price);

Lets multiply price and show it.

price *=5;
console.log(price);

and finally we will divide it.

price /=5;
console.log(price);

If you have any doubts, comment below.

#javascript #javascript compound assignment operators #javascript binary operators #javascript simple assignment operator #doers javascript

Eldora  Bradtke

Eldora Bradtke

1594059180

Rest Parameter and Spread Operator

The Rest Parameter

A Rest Parameter is used as the last argument of a function declaration. It is enabling the user to specify any number of parameters.

function sumUp(...nums) {
	  return nums.reduce((acc, cur) => acc = Number(acc + cur), 0);
	}

	console.log(sumUp(1, 2, 3));
	// -> 6

A function can also have common parameters as long as the Rest Parameter is the last one.

	function myHero(name, level, ...abilities) {
	  return `My hero ${name} on level ${level} has the following abilities: ${abilities.join(", ") || 'none'}.`;
	}

	console.log(myHero('Arthas', 55, 'Attack', 'Blizzard'));
	// -> My hero Arthas on level 55 has the following abilities: Attack,Blizzard.

	console.log(myHero('Thrall', 1));
	// -> My hero Thrall on level 1 has the following abilities: none.

Rest Parameter vs. Arguments

Arguments is an Array-like Object; we cannot directly apply Array-functions to it. We have to make use of the Spread Operator to unfold the Arguments Object in an Array first. For instance: In the last example, we could apply the join method directly to our abilities parameter.

function sumUp() {
	  return [...arguments].reduce((acc, cur) => acc = Number(acc + cur), 0);
	}

	console.log(sumUp(1, 2, 3));
	// -> 6

#spread-operator #es6 #rest-parameter #learn-javascript #javascript-basics #javascript

Rahul Jangid

1622207074

What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

#javascript #javascript code #javascript hello world #what is javascript #who invented javascript

Eve  Klocko

Eve Klocko

1594655850

JavaScript spread operator: To infinity and beyond!

Three dots can make a huge difference in a sentence. In JavaScript, this is not the exception. In JavaScript, the spread operator is identified by using three dots. This syntax is very powerful because it allows you to perform plenty of different tasks in a very simple and easy way.

Let’s go over some examples of how to use this syntax on JavaScript.

Passing arrays as arguments

The spread operator lets you grab an array, and decompose it in such a way that now you can have each one of the values out of it and can be passed as arguments to a function.

Let’s start by assuming you have the following code. A function that takes in three arguments and logs them separated by commas and an array with three elements.

const fun = (a, b, c) => console.log(`${a}, ${b}, ${c}`);
const arr = [0, 1, 2];

You could do this in a simple but not ideal way. This is, to take each one of the elements out of the array by their indexes and passing them as arguments.

const fun = (a, b, c) => console.log(`${a}, ${b}, ${c}`);
const arr = [0, 1, 2];

fun(arr[0], arr[1], arr[2]);

#javascript-development #typescript #javascript #arrays #software-development

Sierra  Roob

Sierra Roob

1591237444

Explain: Three dots or spread operator

Explain: Three dots or spread operator
Javascript Three dot is spread operator or syntax
Unbelievable Feature release by ES6. it’s called spread operator or rest operator
Let’s deep dive into all features. ES6 provides many operators and feature but some beginners are failed to remember this feature. From many experience developer also not using this feature during development

#javascript #spread operator #three dot #operator