How Can I Ensure Array.prototype.indexOf() Compatibility Across Browsers, Especially Internet Explorer?

Maintaining Array.prototype.indexOf() Compatibility in Internet Explorer

In JavaScript, the Array.prototype.indexOf() function is not natively supported in Internet Explorer browsers. To resolve this, developers may opt to extend the functionality manually.

One approach involves implementing 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;
}

However, it is recommended to check if the indexOf() function already exists and implement the extension only if necessary:

if (!Array.prototype.indexOf) {

    // Implement function here

}

This approach is preferred to browser detection code, as browser compatibility can change over time. MDC recommends this method as it ensures compatibility without relying on unreliable browser detection.

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