3 JavaScript Array Methods Every Developer Should Know

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3 JavaScript Array Methods Every Developer Should Know

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Dylan  Iqbal

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25 JavaScript Array Methods Every Developer Should Know

Master JavaScript arrays with these 25 methods and become a more productive JavaScript developer.

Arrays are wonderful and a very particular type in JavaScript. There are many useful built-in properties and methods that will help you resolve any task which involves arrays. Today we are going to discuss 25 array methods every developer should know.

  • every()
  • reduce()
  • flat()
  • filter()
  • findIndex()
  • find()
  • isArray()
  • from()
  • some()
  • indexOf() and lastIndexOf()
  • shift()
  • unshift()
  • pop()
  • push()
  • reverse()
  • join()
  • includes()
  • fill()
  • concat()
  • sort()
  • splice()
  • slice()
  • map()
  • forEach()

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Terry  Tremblay

Terry Tremblay

1602154740

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"].

#javascript-tips #array-methods #javascript-development #javascript #arrays