JSFiddle - React, Tailwind, and code Playground

JavaScript

var a  = [26, 27, 28, 29];
var ab = [41, 42, 43, 44];
var result = [];


for (i=0; i<a.length; i++) {

  for (j=0; j<ab.length; j++) {
    var b;
    b = ab[j]-a[i];
    result.push(b);
    console.log(result);
  }
}