Return to Answer

For numbers you can use ES6 Array.from(), which works in everything these days except IE:

Shorter version:

Array.from({length: 20}, (x,i) => i);

Longer version:

Array.from(new Array(20), (x,i) => i)

which creates an array from 0 to 19 inclusive. This can be further shortened to one of these forms:

Array.from(Array(20).keys())
// or
[...Array(20).keys()]

Lower and upper bounds can be specified too, for example:

Array.from(new Array(20), (x,i) => i + *lowerBound*)

An article describing this in more detail: http://www.2ality.com/2014/05/es6-array-methods.html

For numbers you can use ES6 Array.from(), which works in everything these days except IE:

Shorter version:

Array.from({length: 20}, (x,i) => i);

Longer version:

Array.from(new Array(20), (x,i) => i);​​​​​​

which creates an array from 0 to 19 inclusive. This can be further shortened to one of these forms:

Array.from(Array(20).keys());
// or
[...Array(20).keys()];

Lower and upper bounds can be specified too, for example:

Array.from(new Array(20), (x,i) => i + *lowerBound*);

An article describing this in more detail: http://www.2ality.com/2014/05/es6-array-methods.html

For numbers you can use ES6 Array.from(), which works in everything these days except IE:

Array.from(new Array(20), (x,i) => i)

which creates an array from 0 to 19 inclusive. This can be further shortened to one of these forms:

Array.from(Array(20).keys())
// or
[...Array(20).keys()]

Lower and upper bounds can be specified too, for example:

Array.from(new Array(20), (x,i) => i + *lowerBound*)

An article describing this in more detail: http://www.2ality.com/2014/05/es6-array-methods.html

For numbers you can use ES6 Array.from(), which works in everything these days except IE:

Shorter version:

Array.from({length: 20}, (x,i) => i);

Longer version:

Array.from(new Array(20), (x,i) => i)

which creates an array from 0 to 19 inclusive. This can be further shortened to one of these forms:

Array.from(Array(20).keys())
// or
[...Array(20).keys()]

Lower and upper bounds can be specified too, for example:

Array.from(new Array(20), (x,i) => i + *lowerBound*)

An article describing this in more detail: http://www.2ality.com/2014/05/es6-array-methods.html

For numbers you can soon use the ES6 array feature. Which currently only works in Firefox.

Array.from(new Array(20), (x,i) => i)

Would create an array from 0 to 19. Lower and upper bounds can be added for example by

Array.from(new Array(20), (x,i) => i + *lowerBound*)

An article describing it more precise: http://www.2ality.com/2014/05/es6-array-methods.html

For numbers you can use ES6 Array.from(), which works in everything these days except IE:

Array.from(new Array(20), (x,i) => i)

which creates an array from 0 to 19 inclusive. This can be further shortened to one of these forms:

Array.from(Array(20).keys())
// or
[...Array(20).keys()]

Lower and upper bounds can be specified too, for example:

Array.from(new Array(20), (x,i) => i + *lowerBound*)

An article describing this in more detail: http://www.2ality.com/2014/05/es6-array-methods.html