How Does JavaScript Handle Arguments Without Predefined Parameters?

Unveiling JavaScript's Hidden Power

Contrary to its perceived simplicity, JavaScript holds a plethora of concealed capabilities that proficient programmers should master. Here's a notable one:

Arguments Array-like Object

Unlike many other languages, JavaScript functions don't require explicitly defined parameters. Instead, they possess an "arguments" array-like object that behaves similarly to an array. This allows for flexible handling of arguments in functions:

<code class="javascript">function sum() {
    var retval = 0;
    for (var i = 0, len = arguments.length; i < len; ++i) {
        retval += arguments[i];
    }
    return retval;
}

console.log(sum(1, 2, 3)); // Output: 6</code>

This feature grants JavaScript functions a significant degree of versatility, enabling them to handle varying numbers of arguments seamlessly.

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