Editing String Reversal

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Preparation code

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Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

var rev = str.split('').reverse().join('');

Test 2

Title

Async (check if this is an asynchronous test)

Code

var i = str.length,
  rev = '';

while(i--) {
  rev += str.charAt(i);
}

Test 3

Title

Async (check if this is an asynchronous test)

Code

var i = str.length,
  rev = [];

while(i--) {
  rev.push(str.charAt(i));
}
rev = rev.join('');