JavaScript Coding Questions

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

Sort: most accepted Difficulty: easy

1. implement curry()JavaScript easy26887 accepted
6. implement basic debounce()JavaScript Lodash easy14627 accepted
19. find corresponding node in two identical DOM tree JavaScript easy9729 accepted
11. what is Composition? create a pipe()JavaScript easy8280 accepted
17. Create a simple store for DOM element JavaScript easy7429 accepted
18. Improve a function JavaScript easy6577 accepted
28. implement clearAllTimeout()JavaScript easy6394 accepted
167. Intersection of unsorted arrays JavaScript Algorithm easy5458 accepted
162. find the single integer JavaScript Algorithm easy4606 accepted
15. implement a simple DOM wrapper to support method chaining like jQuery JavaScript easy4562 accepted
25. Reorder array with new indexes JavaScript Algorithm easy4463 accepted
165. remove characters Algorithm easy4229 accepted
155. create a count function JavaScript easy4075 accepted
159. implement promisify()JavaScript easy3912 accepted
35. implement `Promise.race()`JavaScript easy3890 accepted
148. create a counter object JavaScript easy3636 accepted
154. Two-way binding JavaScript DOM easy3103 accepted
39. implement range()JavaScript easy2782 accepted
91. invert a binary tree JavaScript Algorithm easy2714 accepted
89. Next Right Sibling JavaScript DOM easy2523 accepted
157. semver compare JavaScript easy2510 accepted
37. implement Binary Search (unique)JavaScript easy2315 accepted
60. create your own `new` operator JavaScript easy2237 accepted
31. implement async helper - `race()`JavaScript easy2176 accepted
47. reverse a linked list JavaScript Algorithm easy2119 accepted
145. most frequently occurring character JavaScript easy2101 accepted
40. implement Bubble Sort JavaScript Algorithm easy1957 accepted
133. roman numerals to integer JavaScript easy1902 accepted
118. Virtual DOM II - createElement JavaScript easy1894 accepted
163. integer to roman numerals JavaScript Algorithm easy1884 accepted
107. Find the largest difference JavaScript Algorithm easy1690 accepted
81. merge sorted arrays JavaScript Algorithm easy1682 accepted
121. A number sequence JavaScript easy1676 accepted
105. find the first duplicate character in a string JavaScript string easy1663 accepted
38. implement `jest.spyOn()`JavaScript easy1543 accepted
106. Find two numbers that sum up to 0 JavaScript Algorithm easy1530 accepted
138. Intersection of two sorted arrays JavaScript Algorithm easy1520 accepted
120. create `isPrime()`JavaScript Algorithm easy1512 accepted
94. implement your own `Object.create`JavaScript easy1510 accepted
102. validate string of parentheses JavaScript Algorithm string easy1510 accepted
48. search first index with Binary Search(possible duplicate array)JavaScript Algorithm easy1466 accepted
87. longest substring with unique characters JavaScript Algorithm easy1420 accepted
140. Virtual DOM III - Functional Component JavaScript easy1393 accepted
97. compress a string JavaScript string easy1346 accepted
54. flatten Thunk JavaScript easy1342 accepted
109. implement `Math.pow()`JavaScript Algorithm easy1248 accepted
116. implement Object.is()JavaScript easy1240 accepted
49. search last index with Binary Search(possible duplicate array)JavaScript Algorithm easy1206 accepted
42. implement Insertion Sort JavaScript Algorithm easy1137 accepted
93. Generate Fibonacci Number with recursion JavaScript easy1110 accepted
147. Pick up stones JavaScript easy1107 accepted
100. detect circle in linked list JavaScript Algorithm easy1098 accepted
44. implement Selection Sort JavaScript Algorithm easy992 accepted
50. search element right before target with Binary Search(possible duplicate array)JavaScript Algorithm easy978 accepted
51. search element right after target with Binary Search(possible duplicate array)JavaScript Algorithm easy861 accepted
96. count "1" in binary form JavaScript easy804 accepted
62. implement BigInt addition JavaScript Algorithm easy774 accepted
142. lit-html 1 - tagged templates JavaScript lit-html easy658 accepted
72. implement Observable interval()JavaScript easy448 accepted
74. implement Observable Transformation Operators JavaScript easy414 accepted
73. implement Observable fromEvent()JavaScript easy394 accepted
141. implement btoa()JavaScript easy260 accepted