Editing `Underscore.map` vs `jQuery.map` vs. `for` loop vs. `Lo-Dash.map'

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Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script>

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Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

$.map(a, function(index, val) {
  return val;
});

Test 2

Title

Async (check if this is an asynchronous test)

Code

for (var i = 0, len = a.length; i < len; i++) {
  newArray[i] = 
    a[i]
  ;
}

Test 3

Title

Async (check if this is an asynchronous test)

Code

underscore.map(a, function(item) {
  return
    item
  ;
});

Test 4

Title

Async (check if this is an asynchronous test)

Code

lodash.map(a, function(item) {
  return
    item
  ;
});

Test 5

Title

Async (check if this is an asynchronous test)

Code

lodash.each(a, function(item) {
  return
    item
  ;
});

Test 6

Title

Async (check if this is an asynchronous test)

Code

underscore.each(a, function(item) {
  return
    item
  ;
});

Editing Underscore.map vs jQuery.map vs. for loop vs. `Lo-Dash.map'

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Test case details

Preparation code

Code snippets to compare

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Editing `Underscore.map` vs `jQuery.map` vs. `for` loop vs. `Lo-Dash.map'