How to use filter function

The arr.filter() function in How to use filter function is used to create a new array from a given array that contains only those elements in the given array that meet the conditions set by the parameter function. Let's take a closer look at how to use filter().

The basic syntax of filter() is as follows:

var newArray = arr.filter(arg_function[, this_arg])

The parameter of the filter() function is another function that defines each element of the array. Check the conditions. This arg_function itself has three parameters:

array: This is the array in which the .filter() function is called.

index: This is the index of the current element processed by the function.

element: This is the current element that the function is processing.

Another parameter this_arg is used to indicate that the function uses this value when executing the parameter function.

Let’s look at a specific example

The function filter() creates a new array that only contains elements that meet the conditions checked by the isPositive() function.

Example 1:

The output result is: 112,52,944

Example 2:

The output result is: 98,944

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