jsphkhan
/ findarraysum.js
Last active
June 23, 2018 16:55
Given an array of numbers, find the 2 elements/numbers from the array that add up to a given sum
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| /* | |
| eg. [1,2,3,9] Sum = 8, Output = -1 //not found | |
| [1,2,4,4] Sum = 8, Output = 2,3 //found (return the index of matched elements) | |
| Assumption - input array is sorted | |
| This solution here is the fastest way, which is O(n) - linear time | |
| */ | |
| function findElementsThatAddToASum(arr, sum) { |
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| /* | |
| Given an input object | |
| var obj = { | |
| a: { | |
| b: 1, | |
| c: 1, | |
| d: { | |
| e: 1, | |
| f: 1 | |
| } |
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| //Binary Search | |
| //Runtime - O(log n) | |
| //Faster than Linear search | |
| function binarySearch(arr, num) { | |
| //sort the array | |
| //arr.sort() modifies the original array | |
| arr.sort(function(a, b) { | |
| return a - b; | |
| }); |
jsphkhan
/ fibonacci.js
Last active
June 27, 2018 17:47
Print the fibonacci series till the nth sequence. Use memoization. (JavaScript solution)
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| //Normal fibonacci - No Memoization | |
| //Fib series - 1 1 2 3 5 8 13 21 34 ... | |
| //O(2^n) = exponential time complexity | |
| function fib(n) { | |
| if(n <= 2) { | |
| return 1; | |
| } | |
| return fib(n-2) + fib(n-1); | |
| } |
jsphkhan
/ eventdelegation.js
Created
June 12, 2018 18:01
Event Delegation with Plain Vanilla JavaScript
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| /* Imagine we have a <div id="myDiv"></div> element. Suppose a new element <div class='new-element'></div> is appended | |
| to the parent. Write a JS function that can do event delegation to an element that will be added in future. */ | |
| var parentRef = document.getElementById('myDiv'); //document.querySelector('#myDiv') | |
| function delegate(type, elRef, callback) { | |
| parentRef.addEventListener(type, function(evt) { | |
| document.querySelectorAll(elRef).forEach(function(el) { | |
| if(el === evt.target) { | |
| callback.call(null, evt); | |
| } |
jsphkhan
/ polymer-iron-list-dynamic-add.html
Created
August 18, 2015 13:42
Polymer 1.0 example that shows how to add items to iron-list dynamically using Array mutation techniques
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| <!doctype html> | |
| <html> | |
| <head> | |
| <title>iron-list dynamic list item</title> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1, user-scalable=yes"> | |
| <meta name="mobile-web-app-capable" content="yes"> | |
| <meta name="apple-mobile-web-app-capable" content="yes"> |
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| <link rel="import" href="../yodlee-component/yodlee-scaffold.html"> | |
| <link rel="import" href="../yodlee-component/yodlee-navigation.html"> | |
| <link rel="import" href="../hackathon-elements/yodlee-account-summary.html"> | |
| <link rel="import" href="../hackathon-elements/yodlee-recent-transactions.html"> | |
| <link rel="import" href="../hackathon-elements/yodlee-profile-card-bundled.html"> | |
| <link rel="import" href="../yodlee-component/yodlee-notifications.html"> | |
| <polymer-element name="my-element"> | |
| <template> |
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| <link rel="import" href="../yodlee-component/yodlee-scaffold.html"> | |
| <link rel="import" href="../hackathon-elements/yodlee-account-summary.html"> | |
| <link rel="import" href="../yodlee-component/yodlee-navigation.html"> | |
| <link rel="import" href="../hackathon-elements/yodlee-recent-transactions.html"> | |
| <link rel="import" href="../hackathon-elements/yodlee-profile-card-bundled.html"> | |
| <link rel="import" href="../yodlee-component/yodlee-notifications.html"> | |
| <polymer-element name="my-element"> | |
| <template> |
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| <link rel="import" href="../yodlee-component/yodlee-scaffold.html"> | |
| <link rel="import" href="../yodlee-component/yodlee-navigation.html"> | |
| <link rel="import" href="../hackathon-elements/yodlee-recent-transactions.html"> | |
| <link rel="import" href="../hackathon-elements/yodlee-account-summary.html"> | |
| <link rel="import" href="../hackathon-elements/yodlee-profile-card-bundled.html"> | |
| <link rel="import" href="../yodlee-component/yodlee-notifications.html"> | |
| <polymer-element name="my-element"> | |
| <template> |
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| <link rel="import" href="../yodlee-component/yodlee-scaffold.html"> | |
| <link rel="import" href="../yodlee-component/yodlee-navigation.html"> | |
| <link rel="import" href="../hackathon-elements/yodlee-account-summary.html"> | |
| <link rel="import" href="../hackathon-elements/yodlee-recent-transactions.html"> | |
| <link rel="import" href="../yodlee-component/yodlee-notifications.html"> | |
| <link rel="import" href="../hackathon-elements/yodlee-profile-card-bundled.html"> | |
| <polymer-element name="my-element"> | |
| <template> |