In JavaScript, we can combine indexOf() and splice() to remove a certain element from an Array.

        var array = [1, 2, 3, 4, 5];
        console.log(array)
        // I want remove num 4, find the index first, -1 if it is not present.
        var index = array.indexOf(4);
        if (index > -1) { // found
            array.splice(index, 1);
        // array = [1, 2, 3, 5];
        console.log(array);
        var lang = ['java', 'node js', 'javascript', 'pyhton'];
        console.log(lang)
        // I want remove node js
        var index = lang.indexOf(`node js`);
        if (index > -1) {
            lang.splice(index, 1);
        //lang = ['java', 'javascript', 'pyhton'];
        console.log(lang);