How Can I Efficiently Extend a JavaScript Array Like Python\'s `extend` Method?

Extending JavaScript Arrays

In certain scenarios, developers may need to extend an existing JavaScript array with an additional array, a task analogous to Python's extend method. However, unlike Python, JavaScript does not provide a direct way to extend arrays without creating a new array.

Emulating Python's Extend Method

To emulate Python's extend method, one approach involves the .push method. The .push method can accept multiple arguments, allowing developers to use the spread operator (...) or the .apply method to pass all elements of the second array as arguments to .push. These techniques effectively extend the first array without copying it.

Browser Support

It's important to note that browsers with support for ECMAScript 6 (ES6) can utilize the spread operator, while older browsers require .apply. For clarity, developers can also explicitly use Array.prototype.push.apply().

Loop-Based Technique

In cases where the second array is excessively large (over 100,000 elements), using the .push method can trigger a stack overflow error. As an alternative, a standard loop-based technique can be employed to iterate through the elements of the second array, adding them to the end of the first array one at a time.

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