create-an-array-containing-1-to-n.md

Create An Array Containing 1 To N

Some languages, such as Ruby, have a built in range constraint that makes it easy to construct an array of values from 1 to N. JavaScript is not one of those languages. Nevertheless, if you don't mind the aesthetics, you can get away with something like this:

> Array.apply(null, {length: 10}).map(Number.call, Number);
=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

That gives us 0 through 9. To get 1 through 10, we can tweak it slightly:

> Array.apply(null, {length: 10}).map(Number.call, function(n) {
    return Number(n) + 1;
  });
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

To generalize this, we can replace 10 with N and then just expect that N will be defined somewhere:

> var N = 10;
=> undefined
> Array.apply(null, {length: N}).map(Number.call, function(n) {
    return Number(n) + 1;
  });
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

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