Run results for: Array join vs concatenation vs interpolation

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:149.0) Gecko/20100101 Firefox/149.0

Browser: Firefox 149

Operating system: Linux

Device Platform: Desktop

Date tested: one month ago

Script Preparation code:

var arr = [];
for (var i = 0; i < 1000000; i++) {
  arr.push(i);
}

Tests:

Array join
var obj = {}; for (var i = 0; i < arr.length; i++) { var key = ['a', i, 'b'].join('_'); obj[key] = obj[key] || i; }
String Concatenation
var obj = {}; for (var i = 0; i < arr.length; i++) { var key = 'a_' + i + '_b'; obj[key] = obj[key] || i; }
String Interpolation
var obj = {}; for (var i = 0; i < arr.length; i++) { var key = `a_${i}_b`; obj[key] = obj[key] || i; }