String Concat vs Array Join

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String Concatenation (+= Operator)
var result = '';
for (var i = 0; i < 1000; i++) {
  result += 'a';
}
ready
Array Join (join() Method):
var arr = [];
for (var i = 0; i < 1000; i++) {
  arr.push('a');
}
var result = arr.join('');
ready

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