How to remove null and falsy in JavaScript array

We will learn to How to remove null and falsy in JavaScript array with code examples. “In JavaScript, a truthy value is a value that is considered true when encountered in a Boolean context. All values are truthy unless they are defined as falsy. That is, all values are truthy except false, 0, -0, 0n, "", null, undefined, and NaN.”

1. Boolean Constructor to remove null and false in JavaScript string array

The Javascript array. filter() is a standard built-in function of the array it returns a new array with all elements which passed the condition implemented by a callback function. The array. filter() runs a callback function for each array element. if the callback function returns true the array element includes in the return result array.

const strArr = ['dev', null, 'enum', null, 'c',false];
var myFilterArray = strArr.filter(Boolean);
console.log(myFilterArray)

Output

[ 'dev', 'enum', 'c' ]

2. !! expression How to remove null and false in JavaScript string array

In this example, we have removed Falsy using the !! expression by using the Array.filter() method.We have defined a function name checkfalse() that takes an array as input and prints the result.

const strArr = [1, 2, null, null, 'c',false];

function checkfalse(arr) {
  return arr.filter(function(item) { return !!item; });
}

console.log(checkfalse(strArr))

Output

[ 1, 2, 'c' ]

const strArr = [1, 2, null, null, 'c',false,'Dev'];

var result = strArr.filter((item) => {return Boolean(item) === true })

console.log(result)

[ 1, 2, 'c' ]