Editing `Underscore.each` vs `jQuery.each` vs. `for` loop vs. nimble-foreach

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Test 1

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

Test 2

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

Test 3

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Async (check if this is an asynchronous test)

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

Editing Underscore.each vs jQuery.each vs. for loop vs. nimble-foreach

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Test case details

Preparation code

Code snippets to compare

Test 1

Test 2

Test 3

Editing `Underscore.each` vs `jQuery.each` vs. `for` loop vs. nimble-foreach