Generating Different Combinations of an Array of Strings [JavaScript]

Question

How can I generate in JavaScript all the different combinations between the elements of an array of strings with the following conditions:

The input array of strings always has different elements (no repetition);
A different combination is always between 2 different elements (strings);
The order does not matter (the combination "A" & "B" is the same as "B" & "A").

For instance, with this input array of strings:

var array = ["A", "B", "C"];

The different combinations would only be:

"A" & "B" ("B" & "A" is the same combination);
"A" & "C" ("C" & "A" is the same combination);
"B" & "C" ("C" & "B" is the same combination).

I pretend to use it to do something like this:

var count = 0;
for each (different combinations in input array of strings){
   console.log (item1 of combination);
   console.log (item2 of combination);
   count = count + 1;
}
console.log(count);

Thank you *

Dij · Accepted Answer · 2017-06-16 16:06:19Z

2

Something like this would work.

var arr = ["A", "B", "C"];
var count = 0;
for (var i=0; i<arr.length; i++){
   for (var j=i+1; j<arr.length; j++){
      console.log(arr[i] + arr[j]);
      count = count + 1;
   }
}
console.log(count);

answered Jun 16, 2017 at 16:06

Dij

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1 Comment

Julia Over a year ago

Thank you * Definitely easier than I thought

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