Best of Modern JavaScript — Typed Array Methods

Since 2015, JavaScript has improved immensely.

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In this article, we’ll look at JavaScript typed arrays methods.

Static Methods

The from static method lets us convert an array-like or iterable object into a typed array.

The first argument is the iterable object we want to convert to a typed array.

The 2nd is a callback that has the value of the entry and the index as the parameter of the array to let us return something we want.

The 3rd argument is the value of this we want to have in the callback in the 2nd argument.

The 2nd and 3rd arguments are optional.

For example, we can write:

const typedArr = Uint16Array.from([0, 1, 2]);

We pass in the array value and returns a Uint16Array with the entries from the array.

The callback for mapping the entries let us create a new array that doesn’t overflow rather than have them overflow.

For example, instead of writing:

const arr = Int8Array.of(200, 201, 202).map(x => 2 * x)

And get the Int8Array with values [-112, -110, -108] .

We can write:

const arr = Int32Array.from(Int8Array.of(120, 121, 122), x => x * 2)

and get [240, 242, 244] in an Int32Array .

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Fill and Filter in Array in JavaScript

By the word Array methods, I mean the inbuilt array functions, which might be helpful for us in so many ways. So why not just explore and make use of them, to boost our productivity.

Let’s see them together one by one with some amazing examples.

Array.fill():

The _fill()_ method changes all elements in an array to a static value, from a start index (default _0_) to an end index (default _array.length_). It returns the modified array.

In simple words, it’s gonna fill the elements of the array with whatever sets of params, you pass in it. Mostly we pass three params, each param stands with some meaning. The first param value: what value you want to fill, second value: start range of index(inclusive), and third value: end range of index(exclusive). Imagine you are going to apply this method on some date, so that how its gonna look like eg: array.fill(‘Some date’, start date, end date).

NOTE: Start range is inclusive and end range is exclusive.

Let’s understand this in the below example-

//declare array
var testArray = [2,4,6,8,10,12,14];

console.log(testArray.fill("A"));

When you run this code, you gonna see all the elements of testArray will be replaced by 'A' like [“A”,"A","A","A","A","A","A"].

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Learn JavaScript Arrays

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Learn Arrays And Array Methods in JavaScript

In JavaScript, an array is a data structure that contains list of elements which store multiple values in a single variable. The strength of JavaScript arrays lies in the array methods. Array methods are functions built-in to JavaScript that we can apply to our arrays — Each method has a unique function that performs a change or calculation to our array and saves us from writing common functions from scratch.
In this video we are going to learn arrays and array methods like sort(), reverse(), join(), split(), pop(), push(), shift(), unshift(), toString(), delete array, etc…

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