Javascript Arguments

javascript_arguments.md

Javascript Arguments

Javascript arguments are stored in an array like structure where indicies can be accesses using bracket notation, however none of the objects properties are available except length.

function args(){
  return arguments;
}
console.log(args(1,2,3) instanceof Array); // -> false

Converting arguments to and array

Using iteration

function argumentsToArray(){  
  var args = []

  for(var i = 0; i < arguments.length; i++){
    args[i] = arguments[i]
  };
  return args
};

var newArray = argumentsToArray(1, 2, 3, [1,2,3], {"city" : "Kilua", "state" : "Hawaii" });
console.log(newArray instanceof Array); // -> true

Using apply

function argumentsToArray(){
  return Array.apply(Array, arguments);
};

var newArray = argumentsToArray(1, 2, 3, [1,2,3], {"city" : "Kilua", "state" : "Hawaii" });
console.log(newArray instanceof Array); // -> true