Does JavaScript have a method like “range()” to generate a range within the supplied bounds?

Question

In PHP, you can do...

range(1, 3); // Array(1, 2, 3)
range(\"A\", \"C\"); // Array(\"A\", \"B\", \"C\")

That is, there is a function that l

Answer 1

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