Given  let doAsynchronousStuff = () => {   return new Promise(resolve => {     setTimeout(() => {       resolve("abcdefg"[Math.floor(Math.random() * 7)])     }, Math.PI * 1 + Math.random())   })   .then(data => console.log(data))...
I'm currently creating a Recursive tree using React and have hit another road block. I am trying to basically pass the path from within my JSON structure. So for each child I want to pass a object prop that looks something like this...  Level 1 c...
I'm reading a slide deck that states "JavaScript is untyped." This contradicted what I thought to be true so I started digging to try and learn more.  Every answer to Is JavaScript an untyped language? says that JavaScript is not untyped...
I understand that to compare two strings for equality, the interpreter has to iterate through both strings and compare each character.   That would make the time complexity 0(n) where n is the length of the shortest string.  However, comparing two nu...
For certain situations, composition is advocated over inheritance. I see this happening more and more in the Ruby and Javascript community.  Composition sounds a lot like multiple inheritance. I have even read that internally in some Ruby implementat...
In a recent JavaScript interview I was asked about overloading vs overriding. I know this is a concept in Java. But is there something similar in JavaScript, and if so what would be code examples?  My understanding is that overloading isn't commo...
I'm just reading JavaScript: The Definitive Guide by David Flanagan.  I'm really enjoing and I'm happy my first Javascript book is this one. :)  However, I can't make much sense of this paragraph (3.7 Immutable Primitive Values and Mu...
There was this problem that asked to return all unique triplets of elements of an array which add up to zero (swapping two elements' places in the triplet does not count as unique).  I came up with the following code:    function threeSum(nums) {...
I am writing a JavaScript application to generate random points on the surface of a sphere. I found this formula on Wolfram to get phi and theta (http://mathworld.wolfram.com/SpherePointPicking.html#eqn2). Phi is the one I am having issues with phi =...
I have the following:  function quickSort(array, low, high) {     var len = array.length,         l = low || 0,         r = high || len - 1,         m = Math.round((l + r) / 2),         t;      do {         while (array[l] < array[m]) {...

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