JavaScript Coding Questions

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

Sort: most accepted Difficulty: easy tag: JavaScript

1. implement curry()JavaScript easy32266 accepted
6. implement basic debounce()JavaScript Lodash easy17408 accepted
19. find corresponding node in two identical DOM tree JavaScript easy10696 accepted
11. what is Composition? create a pipe()JavaScript easy9849 accepted
17. Create a simple store for DOM element JavaScript easy8351 accepted
18. Improve a function JavaScript easy7560 accepted
28. implement clearAllTimeout()JavaScript easy7177 accepted
176. undefined to null JavaScript easy6716 accepted
167. Intersection of unsorted arrays JavaScript Algorithm easy5639 accepted
25. Reorder array with new indexes JavaScript Algorithm easy5240 accepted
15. implement a simple DOM wrapper to support method chaining like jQuery JavaScript easy5222 accepted
162. find the single integer JavaScript Algorithm easy4808 accepted
35. implement `Promise.race()`JavaScript easy4645 accepted
155. create a count function JavaScript easy4342 accepted
159. implement promisify()JavaScript easy4235 accepted
148. create a counter object JavaScript easy3918 accepted
154. Two-way binding JavaScript DOM easy3241 accepted
39. implement range()JavaScript easy3216 accepted
91. invert a binary tree JavaScript Algorithm easy2940 accepted
37. implement Binary Search (unique)JavaScript easy2716 accepted
89. Next Right Sibling JavaScript DOM easy2675 accepted
157. semver compare JavaScript easy2645 accepted
31. implement async helper - `race()`JavaScript easy2592 accepted
60. create your own `new` operator JavaScript easy2546 accepted
47. reverse a linked list JavaScript Algorithm easy2420 accepted
40. implement Bubble Sort JavaScript Algorithm easy2374 accepted
145. most frequently occurring character JavaScript easy2245 accepted
118. Virtual DOM II - createElement JavaScript easy2086 accepted
133. roman numerals to integer JavaScript easy2063 accepted
163. integer to roman numerals JavaScript Algorithm easy1970 accepted
81. merge sorted arrays JavaScript Algorithm easy1924 accepted
121. A number sequence JavaScript easy1847 accepted
107. Find the largest difference JavaScript Algorithm easy1837 accepted
105. find the first duplicate character in a string JavaScript string easy1833 accepted
38. implement `jest.spyOn()`JavaScript easy1822 accepted
48. search first index with Binary Search(possible duplicate array)JavaScript Algorithm easy1724 accepted
102. validate string of parentheses JavaScript Algorithm string easy1704 accepted
94. implement your own `Object.create`JavaScript easy1674 accepted
106. Find two numbers that sum up to 0 JavaScript Algorithm easy1670 accepted
120. create `isPrime()`JavaScript Algorithm easy1652 accepted
87. longest substring with unique characters JavaScript Algorithm easy1645 accepted
138. Intersection of two sorted arrays JavaScript Algorithm easy1645 accepted
54. flatten Thunk JavaScript easy1589 accepted
140. Virtual DOM III - Functional Component JavaScript easy1558 accepted
97. compress a string JavaScript string easy1529 accepted
49. search last index with Binary Search(possible duplicate array)JavaScript Algorithm easy1408 accepted
116. implement Object.is()JavaScript easy1391 accepted
109. implement `Math.pow()`JavaScript Algorithm easy1384 accepted
42. implement Insertion Sort JavaScript Algorithm easy1377 accepted
93. Generate Fibonacci Number with recursion JavaScript easy1238 accepted
147. Pick up stones JavaScript easy1231 accepted
100. detect circle in linked list JavaScript Algorithm easy1204 accepted
44. implement Selection Sort JavaScript Algorithm easy1182 accepted
50. search element right before target with Binary Search(possible duplicate array)JavaScript Algorithm easy1161 accepted
51. search element right after target with Binary Search(possible duplicate array)JavaScript Algorithm easy994 accepted
96. count "1" in binary form JavaScript easy925 accepted
62. implement BigInt addition JavaScript Algorithm easy898 accepted
142. lit-html 1 - tagged templates JavaScript lit-html easy703 accepted
72. implement Observable interval()JavaScript easy504 accepted
75. implement BigInt subtraction JavaScript Algorithm easy496 accepted
74. implement Observable Transformation Operators JavaScript easy451 accepted
73. implement Observable fromEvent()JavaScript easy436 accepted
141. implement btoa()JavaScript easy283 accepted