Javascript, convert an array of double into an array of pair of doubles

Question

Suppose that you have an array of doubles in Javascript:

double_arr = [1, 2, 3, 4, 5, 6, 7, 8]

What is the most efficient way to convert it into an array of arrays with 2 doubles like above:

double_arr = [[1,2], [3,4], [5,6], [7,8]]

Answer 1

You can iterate skipping one index in each iteration, like this:

const double_arr = [1, 2, 3, 4, 5, 6, 7, 8];

const result = [];

for (let i = 0; i < double_arr.length; i += 2)
  result.push([ double_arr[i], double_arr[i+1] ]);
  
console.log(result);