how I can print all case element in array by js

Question

I have array [1,2,3,4]

I want to print all combinations like:

[1]
[2]
[3]
[4]
[1,2]
[1,2,3]
[1,2,3,4]
[2,3]
[2,3,4]
[3,4]
[1,3]
[1,3,4]
[1,4]
[2,4]

How I can do that?

print? print where? console? screen? printer? have you tried anything or did you mistake SO for icanhazcode.com — Jaromanda X, Oct 30 '15 at 07:24
http://stackoverflow.com/questions/12048621/get-all-combinations-for-a-string — Olavi Sau, Oct 30 '15 at 07:26

score 1 · Accepted Answer · answered Oct 30 '15 at 07:29

This is simple to do recursively:

function printCombinations(arr, prefix) {
  if (arr.length == 0) {
    if (prefix.length > 0) {
      console.log(prefix);
    }
    return;
  }
  prefix = prefix || [];
  printCombinations(arr.slice(1), prefix.concat(arr[0]));
  printCombinations(arr.slice(1), prefix);
}

printCombinations([1, 2, 3, 4]);

how I can print all case element in array by js

1 Answers1