JavaScript Coding Questions

As a Front-End developer, JavaScript is the core skill of everything

Sort: most accepted Difficulty: easy

1. implement curry()JavaScript easy31534 accepted
6. implement basic debounce()JavaScript Lodash easy17037 accepted
19. find corresponding node in two identical DOM tree JavaScript easy10598 accepted
11. what is Composition? create a pipe()JavaScript easy9626 accepted
17. Create a simple store for DOM element JavaScript easy8240 accepted
18. Improve a function JavaScript easy7434 accepted
28. implement clearAllTimeout()JavaScript easy7084 accepted
176. undefined to null JavaScript easy6633 accepted
167. Intersection of unsorted arrays JavaScript Algorithm easy5610 accepted
25. Reorder array with new indexes JavaScript Algorithm easy5149 accepted
15. implement a simple DOM wrapper to support method chaining like jQuery JavaScript easy5124 accepted
162. find the single integer JavaScript Algorithm easy4780 accepted
35. implement `Promise.race()`JavaScript easy4538 accepted
155. create a count function JavaScript easy4302 accepted
159. implement promisify()JavaScript easy4188 accepted
148. create a counter object JavaScript easy3878 accepted
154. Two-way binding JavaScript DOM easy3223 accepted
39. implement range()JavaScript easy3150 accepted
91. invert a binary tree JavaScript Algorithm easy2914 accepted
37. implement Binary Search (unique)JavaScript easy2664 accepted
89. Next Right Sibling JavaScript DOM easy2655 accepted
157. semver compare JavaScript easy2617 accepted
31. implement async helper - `race()`JavaScript easy2536 accepted
60. create your own `new` operator JavaScript easy2509 accepted
47. reverse a linked list JavaScript Algorithm easy2384 accepted
40. implement Bubble Sort JavaScript Algorithm easy2311 accepted
145. most frequently occurring character JavaScript easy2220 accepted
118. Virtual DOM II - createElement JavaScript easy2061 accepted
133. roman numerals to integer JavaScript easy2045 accepted
163. integer to roman numerals JavaScript Algorithm easy1954 accepted
81. merge sorted arrays JavaScript Algorithm easy1876 accepted
121. A number sequence JavaScript easy1825 accepted
107. Find the largest difference JavaScript Algorithm easy1822 accepted
105. find the first duplicate character in a string JavaScript string easy1811 accepted
38. implement `jest.spyOn()`JavaScript easy1788 accepted
48. search first index with Binary Search(possible duplicate array)JavaScript Algorithm easy1691 accepted
102. validate string of parentheses JavaScript Algorithm string easy1676 accepted
106. Find two numbers that sum up to 0 JavaScript Algorithm easy1650 accepted
94. implement your own `Object.create`JavaScript easy1646 accepted
120. create `isPrime()`JavaScript Algorithm easy1643 accepted
138. Intersection of two sorted arrays JavaScript Algorithm easy1622 accepted
87. longest substring with unique characters JavaScript Algorithm easy1610 accepted
54. flatten Thunk JavaScript easy1563 accepted
140. Virtual DOM III - Functional Component JavaScript easy1536 accepted
97. compress a string JavaScript string easy1493 accepted
49. search last index with Binary Search(possible duplicate array)JavaScript Algorithm easy1381 accepted
109. implement `Math.pow()`JavaScript Algorithm easy1373 accepted
116. implement Object.is()JavaScript easy1369 accepted
42. implement Insertion Sort JavaScript Algorithm easy1351 accepted
93. Generate Fibonacci Number with recursion JavaScript easy1223 accepted
147. Pick up stones JavaScript easy1222 accepted
100. detect circle in linked list JavaScript Algorithm easy1189 accepted
44. implement Selection Sort JavaScript Algorithm easy1154 accepted
50. search element right before target with Binary Search(possible duplicate array)JavaScript Algorithm easy1143 accepted
51. search element right after target with Binary Search(possible duplicate array)JavaScript Algorithm easy976 accepted
96. count "1" in binary form JavaScript easy908 accepted
62. implement BigInt addition JavaScript Algorithm easy883 accepted
142. lit-html 1 - tagged templates JavaScript lit-html easy697 accepted
72. implement Observable interval()JavaScript easy496 accepted
74. implement Observable Transformation Operators JavaScript easy443 accepted
73. implement Observable fromEvent()JavaScript easy428 accepted
141. implement btoa()JavaScript easy278 accepted