Is the runtime complexity defined by the JS standard on common Array functions like push, pop, shift, slice or splice? Esp. I'm interested in removing and inserting entries at random positions. If the complexity is not defined, what can I expec...
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?...
In some of the projects I'm working on as part of my day job, I need to access data in very large JS objects (on the order of thousands of key-value pairs). I'm trying to improve the efficiency of my code, so I came up with a few questions:...
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 //...
I have a problem which requires a string to be transformed into another one by appending copies of its' initial value to itself. The problem allows to remove single characters at some places.  Explanation  let x = "abba"; // First string...
I am considering using JavaScript object as a dictionary.      var dict = {}     dict['a'] = 1;     dict['b'] = 2;      var my_first = dict['a'];   I am not clear about the time-complexity of such implementation. Is it like ha...
I have an array like this   students = [{name: 'Abbey', age: 25}, {name: 'Brian', age: 45},             {name: 'Colin', age: 25}, {name: 'Dan', age: 78}]   and I want the output to be;  uniqueAges = [45, 78]   To be cl...
I have the memoization fibonacci code and I am having trouble figuring out what the time complexity is of it:  function fibMemo(index, cache) {   cache = cache || [];   if (cache[index]) return cache[index];   else {     if (index < 3) return 1;...
I recently happened to think about object property access times in JavaScript and came across this question which seemed to reasonably suggest that it should be constant time. This also made me wonder if there is a limit on object property key length...
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) {...

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