JavaScript Coding Questions

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

Sort: most accepted Difficulty: easy

1. implement curry()JavaScript easy32540 accepted
6. implement basic debounce()JavaScript Lodash easy17541 accepted
19. find corresponding node in two identical DOM tree JavaScript easy10735 accepted
11. what is Composition? create a pipe()JavaScript easy9921 accepted
17. Create a simple store for DOM element JavaScript easy8387 accepted
18. Improve a function JavaScript easy7620 accepted
28. implement clearAllTimeout()JavaScript easy7227 accepted
176. undefined to null JavaScript easy6754 accepted
167. Intersection of unsorted arrays JavaScript Algorithm easy5655 accepted
25. Reorder array with new indexes JavaScript Algorithm easy5284 accepted
15. implement a simple DOM wrapper to support method chaining like jQuery JavaScript easy5265 accepted
162. find the single integer JavaScript Algorithm easy4824 accepted
35. implement `Promise.race()`JavaScript easy4694 accepted
155. create a count function JavaScript easy4359 accepted
159. implement promisify()JavaScript easy4250 accepted
148. create a counter object JavaScript easy3938 accepted
154. Two-way binding JavaScript DOM easy3247 accepted
39. implement range()JavaScript easy3244 accepted
91. invert a binary tree JavaScript Algorithm easy2961 accepted
37. implement Binary Search (unique)JavaScript easy2735 accepted
89. Next Right Sibling JavaScript DOM easy2687 accepted
157. semver compare JavaScript easy2654 accepted
31. implement async helper - `race()`JavaScript easy2608 accepted
60. create your own `new` operator JavaScript easy2564 accepted
47. reverse a linked list JavaScript Algorithm easy2444 accepted
40. implement Bubble Sort JavaScript Algorithm easy2388 accepted
145. most frequently occurring character JavaScript easy2256 accepted
118. Virtual DOM II - createElement JavaScript easy2104 accepted
133. roman numerals to integer JavaScript easy2078 accepted
163. integer to roman numerals JavaScript Algorithm easy1979 accepted
81. merge sorted arrays JavaScript Algorithm easy1937 accepted
121. A number sequence JavaScript easy1862 accepted
107. Find the largest difference JavaScript Algorithm easy1853 accepted
105. find the first duplicate character in a string JavaScript string easy1844 accepted
38. implement `jest.spyOn()`JavaScript easy1835 accepted
48. search first index with Binary Search(possible duplicate array)JavaScript Algorithm easy1742 accepted
102. validate string of parentheses JavaScript Algorithm string easy1716 accepted
94. implement your own `Object.create`JavaScript easy1691 accepted
106. Find two numbers that sum up to 0 JavaScript Algorithm easy1685 accepted
120. create `isPrime()`JavaScript Algorithm easy1668 accepted
87. longest substring with unique characters JavaScript Algorithm easy1660 accepted
138. Intersection of two sorted arrays JavaScript Algorithm easy1654 accepted
54. flatten Thunk JavaScript easy1602 accepted
140. Virtual DOM III - Functional Component JavaScript easy1571 accepted
97. compress a string JavaScript string easy1547 accepted
49. search last index with Binary Search(possible duplicate array)JavaScript Algorithm easy1418 accepted
116. implement Object.is()JavaScript easy1407 accepted
109. implement `Math.pow()`JavaScript Algorithm easy1400 accepted
42. implement Insertion Sort JavaScript Algorithm easy1382 accepted
93. Generate Fibonacci Number with recursion JavaScript easy1251 accepted
147. Pick up stones JavaScript easy1237 accepted
100. detect circle in linked list JavaScript Algorithm easy1217 accepted
44. implement Selection Sort JavaScript Algorithm easy1189 accepted
50. search element right before target with Binary Search(possible duplicate array)JavaScript Algorithm easy1171 accepted
51. search element right after target with Binary Search(possible duplicate array)JavaScript Algorithm easy1001 accepted
96. count "1" in binary form JavaScript easy936 accepted
62. implement BigInt addition JavaScript Algorithm easy908 accepted
142. lit-html 1 - tagged templates JavaScript lit-html easy706 accepted
72. implement Observable interval()JavaScript easy504 accepted
75. implement BigInt subtraction JavaScript Algorithm easy498 accepted
74. implement Observable Transformation Operators JavaScript easy451 accepted
73. implement Observable fromEvent()JavaScript easy436 accepted
141. implement btoa()JavaScript easy286 accepted