[JS] – How to filter values in an array ?

Use Filter function :

From Eloquent Javascript Book: “Note how the filter function, rather than deleting elements from the existing array, builds up a new array with only the elements that pass the test. This function is pure. It does not modify the array it is given.”

Example:

// Create the original array.
var arr = [5, "element", 10, "the", true];

// Create an array that contains the string
// values that are in the original array.
var result = arr.filter(
    function (value) {
        return (typeof value === 'string');
    }
);

document.write(result);
// Output: element, the