Check whether a string contains a substring in #JavaScript.

substring.md

List of current possibilities:

1. indexOf - (see bottom)

    var string = "foo", 
        substring = "oo"; 
    alert(string.indexOf(substring) > -1);

2. (ES6) includes - go to answer, or this answer

    var string = "foo", 
        substring = "oo"; 
    string.includes(substring);

3. search - go to answer

    var string = "foo", 
        expr = "/oo/"; 
    string.search(expr);

4. lodash includes - go to answer

    var string = "foo", 
        substring = "oo"; 
    _.includes(string, substring);

5. RegExp - go to answer

    var string = "foo", 
        expr = /oo/; 
    // no quotes here expr.test(string);

6. Match - go to answer

    var string = "foo", 
        expr = "/oo/"; 
    string.match(expr);

Performance tests (http://jsben.ch/#/RVYk7) are showing that indexOf might be the best choice, if it comes to a point where speed matters.

Source & credits