How to disable or add an object to the beginning of arguments in JavaScript

Question

I just found out the convention for popping up the first element of the arguments array (which I also actually recognized Object ). Now I need to do the opposite. I need to use the unshift operation to add a value to the beginning of an arguments array (or an Object acting as an array). Is it possible? I tried:

 Array.prototype.unshift.apply('hello', arguments); 

This did not affect the arguments .

Answer 1

• use .call() instead of .apply() to call unshift()

• set arguments as the value of this unshift()

• set 'hello' as an argument to unshift()

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 Array.prototype.unshift.call(arguments, 'hello'); 

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As @lonesomeday noted, you can use .apply() instead of .call() , but you need to pass an argument like an array as the second argument. So in your case you need to wrap 'hello' in an array.