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When is it needed?

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arr.findIndex(callback( element, index, array ) ,thisArg)

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let numbersStr = "1,2,3,4,5";let numArray = numbersStr.split(",");console.log(numArray); // ["1","2","3","4","5"]

Learn how to make requests using XMLHttpRequests

summary of key XMLHttpRequest commands covered in this article
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What Is XMLHttpRequest (XHR)?

Steps to Make a Request Using XMLHttpRequest

1. Create a XMLHttpRequest object

let request = new XMLHttpRequest();

2. Configure the object with request details

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Checking if a primitive value present in an array

var num = [1,2,3,4,5];


num.indexOf(3); // 2num.indexOf(6); //-1num.indexOf('3'); // -1
var array = [NaN];array.indexOf(NaN); // -1

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