Editing `Underscore.each` vs `jQuery.each` vs. `for` loop vs. forEach

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

Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ)

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Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

$.each(a, function() {
  e = pi;
});

Test 2

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Async (check if this is an asynchronous test)

Code

for (var i = 0, len = a.length; i < len; i++) {
  e = pi;
};

Test 3

Title

Async (check if this is an asynchronous test)

Code

_.each(a, function(item) {
  e = pi;
});

Test 4

Title

Async (check if this is an asynchronous test)

Code

var i = a.length;
for (; i > 0; i--) {
  e = pi;
};

Test 5

Title

Async (check if this is an asynchronous test)

Code

a.forEach(function() {
  e = pi;
})

Editing Underscore.each vs jQuery.each vs. for loop vs. forEach

Your details (optional)

Test case details

Preparation code

Code snippets to compare

Test 1

Test 2

Test 3

Test 4

Test 5

Editing `Underscore.each` vs `jQuery.each` vs. `for` loop vs. forEach