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:
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script>
function isPositive(value) {
return value > 0;
}
function func() {
var filtered = [112, 52, 0, -1, 944].filter(isPositive);
document.write(filtered);
}
func();
</script>
</body>
</html>The output result is: 112,52,944
Example 2:
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script>
function isEven(value) {
return value%2 == 0;
}
function func() {
var filtered = [11, 98, 31, 23, 944].filter(isEven);
document.write(filtered);
}
func();
</script>
</body>
</html>The output result is: 98,944
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