JavaScript determines whether a string contains a specified substring

From , 5 Years ago, written in JavaScript, viewed 241 times.

if (!Array.prototype.indexOf) { 
    Array.prototype.indexOf = function(obj, start) {
         for (var i = (start || 0), j = this.length; i < j; i++) {
             if (this[i] === obj) { return i; }
         }
         return -1;
    }
}
 // http://www.sharejs.com
if (!String.prototype.contains) {
    String.prototype.contains = function (arg) {
        return !!~this.indexOf(arg);
    };
}
 
 
//javascript/8789

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JavaScript determines whether a string contains a specified substring

Reply to "JavaScript determines whether a string contains a specified substring"