How Can I Fix the Lack of `Array.prototype.indexOf()` in Older Internet Explorer Versions?

Fixing Array.indexOf() for Internet Explorer

While working with JavaScript, you might encounter the absence of Array.prototype.indexOf() in Internet Explorer versions up to IE8. To address this, you can extend its functionality with the following code:

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;
}

To implement this, you should use the following approach:

if (!Array.prototype.indexOf) {

    // Implement function here

}

The above method is recommended by MDC for compatibility reasons.

It's generally not recommended to use browser detection code like:

if (browser == IE Style Browser) {

     // Implement function here

}

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