Take a number and turn it into an array of numbers

Question

I was wondering if there was an easier / cleaner way to expand one integer 6 and make it into an array of numbers [1, 2, 3, 4, 5, 6].

This is what I've got and I hate it.

var pages = function(number_int){
    var numbers_array = [];
    for (var i = 1; i <= number_int; i++) {
        numbers_array.push(i);
    }
    return numbers_array;
};

I'd love to use underscore if I can.

This is really a question for [codereview.se], but it's so trivial I don't think it should be migrated. — , Oct 24 '13 at 19:49
Yeah you're right, but if I posted it to code review, no one would have saw it. — ThomasReggi, Oct 24 '13 at 19:51
http://stackoverflow.com/questions/3746725/create-a-javascript-array-containing-1-n — georg, Oct 24 '13 at 21:26

Farmer Joe · Answer 1 · 2013-10-24T19:53:56.683

5

Look at the range function in underscore.js

edited Oct 24 '13 at 19:53

answered Oct 24 '13 at 19:49

Farmer Joe

6,020
1
30
40

score 2 · Accepted Answer · answered Aug 06 '15 at 21:07

The range function in Underscore.js is pretty handy.

Here is the definition:

_.range([start], stop, [step])

start: optional, default 0
stop : mandatory
step : optional, default 1

Note : range generates values in the range start(inclusive) and stop(exclusive)

So, if number_int = 6 in your case, to generate [1, 2, 3, 4, 5, 6] you must use the range function by specifying stop as number_int + 1

Final Answer:

var pages = function(number_int){
    var numbers_array = [];
    numbers_array = _.range(1,number_int + 1);
    return numbers_array;
};

JSFiddle: https://jsfiddle.net/dineshchitlangia/xj8q5bea/4/

Take a number and turn it into an array of numbers

2 Answers2