Create a Hash with an Array

Question

Hi,

I've an Array ['red', 'green', 'blue']

I want to create a new Hash from this Array, the result should be

{'red':true, 'green':true, 'blue':true}

What is the best way to achieve that goal

I use prototypejs 1.7_rc2

Thanks

Answer 1

Just iterate over the array:

var obj  = {};
for(var i = 0, l = colors.length; i < l; i++) {
    obj[colors[i]] = true;
}

I am not sure what you mean with Hash (in this context) but basically everything is an Object in JavaScript.

Update: If you refer to the Hash object in Prototype, then you can do it like shown and in addition:

var hash = new Hash(obj);

You can also create a new Hash object from the beginning:

var hash = new Hash();

for(var i = 0, l = colors.length; i < l; i++) {
    hash.set(colors[i], true);
}

I suggest to have a look at the documentation.

Answer 2

Thanks all

here is my solution using prototypejs and inspired by Felix's answer

var hash = new Hash();
colors.each(function(color) {
  hash.set(color, true);
});