How do you split an array into array pairs in JavaScript?

Question

I want to split an array into pairs of arrays.

var arr = [2, 3, 4, 5, 6, 4, 3, 5, 5]

would be

var newarr = [
    [2, 3],
           


        

Answer 1

I would use lodash for situations like this.

Here is a solution using _.reduce:

var newArr = _(arr).reduce(function(result, value, index) {
  if (index % 2 === 0)
    result.push(arr.slice(index, index + 2));

  return result;
}, []);

var arr = [2,3,4,5,6,4,3,5,5];

var newArr = _(arr).reduce(function(result, value, index) {
  if (index % 2 === 0)
    result.push(arr.slice(index, index + 2));
  
  return result;
}, []);

document.write(JSON.stringify(newArr)); // [[2,3],[4,5],[6,4],[3,5],[5]]