Take the following code example:  var myObject = {}; var i = 100;  while (i--) {     myObject["foo"+i] = new Foo(i); }  console.log(myObject["foo42"].bar());   I have a few questions.  What kind of data structure do the major engines...
I was reading about runtime complexities of array operations and learned that...   the ECMAScript specification does not mandate a specific runtime complexity, so it depends on the specific implementation / JavaScript engine / runtime behavior [1] [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...
I just saw javascript code about sorting which uses setTimeout as shown   var list = [2,  5, 10, 4, 8, 32];  var result = []; list.forEach( n => setTimeout(() => result.push(n), n));   It is interesting because in js setTimeout is asynchronous...
I am trying to return an array of indexes of values that add up to a given target. I am trying to solve it the fastest way I can!  Examples:  sumOfTwo([1, 2, 4, 4], 8)   // => [2, 3] sumOfTwo([1, 2, 3, 9], 8)   // => []   So first I tried a sim...

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