How to use forEach() Method In Javascript
In order to filter out the array, we will loop through the array and call this function “myFilter“. The value is skipped if it returns true, if the function returns false, then we will store that value in the filteredArr by using “filteredArr.push()” in the filtered array. We use forEach through the array of elements.
Example: In this example, we will filter the negative values from the array using the forEach() method.
Javascript
const arr = [5, 6, 7, 8, 9, 2, 6, 3, -4, 0, -9, -6]; // Filtered array for which function // returned false let filteredArr = []; // Comparator function const myFilter = (element) => { if (element >= 0) { return true ; } else { return false ; } } // Iterate through each element arr.forEach(element => { // Push in the filteredArr if // it returns false if (myFilter(element) === false ) { filteredArr.push(element); } }) console.log( "After filtering:" , filteredArr); |
After filtering: [ -4, -9, -6 ]
How to filter values from an array for which the comparator function does not return true in JavaScript ?
The task is to filter the array based on the returned value when passed to the given function. The purpose is to loop through the array and execute one function that will return true or false. Then filter out all the values for which the function (comparator function) does not return true.
These are the following methods for filtering the values from an array:
- Using forEach() method
- Using filter() Method
- Using for() loop
Approach:
- Start by defining an array named ‘array’ and assign the values to it.
- Define a comparator function name
compare
that will be used to filter the elements. - Apply different methods to get the filtered values.
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