I am experimenting with a more functional style in my JavaScript; therefore, I have replaced for loops with utility functions such as map and reduce.  However, I have not found a functional replacement for while loops since tail call optimization i...
Is there a javascript equivalent of Python's zip function?  That is, given multiple arrays of equal lengths create an array of pairs.  For instance, if I have three arrays that look like this:  var array1 = [1, 2, 3]; var array2 = ['a',...
I need to split a JavaScript array into n sized chunks.  E.g.: Given this array  ["a1", "a2", "a3", "a4", "a5", "a6", "a7", "a8", "a9", "a10", "a11", "a12&#...
In Javascript, how can one determine the number of formal parameters defined for a function?  Note, this is not the arguments parameter when the function is called, but the number of named arguments the function was defined with.  function zero() {...
In short, this works:  [1, 2, 3].reduce(function (a, b) { return Math.max(a, b); }); => 3   But this doesn't:  [1, 2, 3].reduce(Math.max); => NaN   Pure puzzlement.  This is in Firefox 3.5.9, which I presume is using the mozilla standard im...
Here is what official docs said  updateIn(keyPath: Array<any>, updater: (value: any) => any): List<T> updateIn(keyPath: Array<any>, notSetValue: any, updater: (value: any) => any): List<T> updateIn(keyPath: Iterable<a...
I really like the idea of jQuery's deferred/promise pattern or paradigm but sometimes I have trouble wrapping my aging brain around the finer points or specific implementation details.  In fact recently I've found that the deferred/promise pa...
What's the benefit of function composition implementation in libs like underscore, lo-dash and others, similar to this one:  var compose = function() {     var funcs = arguments;      return function() {         var args = arguments;         for...
I learned today that forEach() returns undefined. What a waste!  If it returned the original array, it would be far more flexible without breaking any existing code. Is there any reason forEach returns undefined.  Is there anyway to chain forEach wit...

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