Question

This might be a duplicate but I had little success in finding the right answer. I’m trying to achieve something like this :

var joinArrays = function(myCollectionOfArguments) {
    return array.concat(array1, array2, ..... , arrayN);
};

In which case myCollectionOfArguments will be array1, array2, ..... , arrayN. How could I achieve something like that ? I do know that if I had a callback function I cold pass as many arguments as I would like using .apply(), but in this certain case I’m a bit confused on the approach.

EDIT : So, to be more descriptive : Instead of passing just one argument, I would to be able to pass as many as I want without having to specify it when I define the function’s arguments, in my case myCollectionOfArguments, would be just one argument when defining the function, but when I want to use the function I want to be able to pass more than one argument ;

Answer 1

If I get your intention right, try:

var joinArrays = function(a) {
  return a.concat.apply(a, Array.prototype.slice.call(arguments, 1));
};

var foo = joinArrays([1, 2], [3, 4], [5, 6]);

console.log(foo); // => [1, 2, 3, 4, 5, 6]