If I remove one element from an array using splice() like so:  arr.splice(i, 1);   Will this be O(n) in the worst case because it shifts all the elements after i? Or is it constant time, with some linked list magic underneath?...
What's the big O for JavaScript's array access when used as a hash?  For example,  var x= []; for(var i=0; i<100000; i++){    x[i.toString()+'a'] = 123; // using string to illustrate x[alpha] } alert(x['9999a']); // linear...
I have two object literals like so:  var firstObject = {     x: 0,     y: 1,     z: 2,      a: 10,     b: 20,     e: 30 }  var secondObject = {     x: 0,     y: 1,     z: 2,      a: 10,     c: 20,     d: 30 }   I want to get the intersection of the k...
Example:  var string = "abcde"; var array = string.split(""); // array = ["a", "b", "c", "d", "e"]   What is the amortized running time of this split function? Also, how do I view source code of...
What is the runtime for this recursive flatten function? My guess is that it's linear; can someone explain why?  const arr = [   [14, [45, 60], 6, [47, [1, 2, [14, [45, 60], 6, [47, [1, 2]], 9]]], 9], ];  function flatten(items) {   const flat =...
Assuming there are no crazy optimizations (I'm looking at you Chrome).  I'm talking about raw, nasty, ain't-broke-don't-fix-it, ie v6 javascript, cost.   The lower limit being:  document.getElementById()    Versus:  document.getEleme...
I was studying big O notation for a technical interview and then I realized that javascript's indexOf method may have a time complexity of O(N) as it traverses through each element of an array and returns the index where its found.   We also know...
My function should return the missing element in a given array range. So i first sorted the array and checked if the difference between i and i+1 is not equal to 1, i'm returning the missing element.  // Given an array A such that: // A[0] = 2 //...
Mozilla's website clearly describes hasOwnProperty() and the in operator.  However, it does not give any implementation details in regards to their efficiencies.  I would suspect they'd be O(1) (constant time) but would love to see any refere...
I am using an array with titles. Each titles index corresponds to an id in a database which contains html for that given title.  Lets say I have a string which contains one of the titles.  title = "why-birds-fly"; titles[] // an array which c...

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