JavaScript Coding Questions

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

Difficulty: medium

2. implement curry() with placeholder support JavaScript medium
4. implement basic throttle()JavaScript Lodash medium
5. implement throttle() with leading & trailing option JavaScript Lodash medium
7. implement debounce() with leading & trailing option JavaScript Lodash medium
8. can you shuffle() an array?JavaScript medium
9. decode message JavaScript medium
10. first bad version JavaScript Algorithm medium
12. implement Immutability helper JavaScript medium
13. Implement a Queue by using Stack JavaScript Algorithm medium
14. Implement a general memoization function - `memo()`JavaScript medium
16. create an Event Emitter JavaScript medium
20. Detect data type in JavaScript JavaScript medium
22. implement JSON.parse()JavaScript medium
24. create a Priority Queue in JavaScript JavaScript Algorithm medium
26. implement Object.assign()JavaScript medium
27. implement completeAssign() JavaScript medium
29. implement async helper - `sequence()`JavaScript medium
30. implement async helper - `parallel()`JavaScript medium
32. implement `Promise.all()`JavaScript medium
33. implement `Promise.allSettled()`JavaScript medium
34. implement `Promise.any()`JavaScript medium
36. create a fake timer(setTimeout)JavaScript medium
41. implement Merge Sort JavaScript Algorithm medium
43. implement Quick Sort JavaScript Algorithm medium
45. find the K-th largest element in an unsorted array JavaScript Algorithm medium
46. implement `_.once()`JavaScript Lodash medium
52. create a middleware system JavaScript medium
53. write your own `extends` in es5 JavaScript medium
55. highlight keywords in HTML string JavaScript Algorithm medium
56. call APIs with pagination JavaScript medium
57. create an Observable JavaScript medium
58. get DOM tree height JavaScript Algorithm DOM medium
59. create a browser history JavaScript medium
61. create your own `Function.prototype.call`JavaScript medium
63. create `_.cloneDeep()`JavaScript Algorithm Lodash medium
64. auto-retry Promise on rejection JavaScript medium
65. add comma to number JavaScript medium
66. remove duplicates from an array JavaScript Algorithm medium
67. create your own Promise JavaScript medium
68. get DOM tags JavaScript Algorithm DOM medium
69. implement deep equal `_.isEqual()`JavaScript Lodash medium
70. implement Observable.from()JavaScript medium
71. implement Observable Subject JavaScript medium
75. implement BigInt subtraction JavaScript Algorithm medium
76. implement BigInt addition with sign JavaScript medium
77. implement BigInt subtraction with sign JavaScript medium
78. convert HEX color to RGBA JavaScript medium
79. convert snake_case to camelCase JavaScript medium
82. find available meeting slots JavaScript Algorithm medium
83. create an interval JavaScript medium
84. create a fake timer (setInterval)JavaScript medium
85. implement `_.get()`JavaScript Lodash medium
86. Generate Fibonacci Number JavaScript Algorithm medium
88. support negative Array index in JavaScript JavaScript medium
90. write your own `instanceof`JavaScript medium
92. throttle Promises JavaScript medium
95. implement String.prototype.trim()JavaScript medium
97. compress a string JavaScript string medium
98. validate an IP address JavaScript medium
99. extract all anchor element from HTML string JavaScript medium
101. merge identical API calls JavaScript medium
103. implement Math.sqrt()JavaScript Algorithm medium
104. Traverse DOM level by level JavaScript Algorithm DOM medium
108. Implement a Stack by using Queue JavaScript Algorithm medium
110. serialize and deserialize binary tree JavaScript Algorithm medium
111. Count palindromic substrings JavaScript Algorithm string medium
112. remove duplicate characters in a string JavaScript Algorithm string medium
113. Virtual DOM I JavaScript Algorithm DOM medium
114. implement BigInt multiplication JavaScript medium
115. implement BigInt division JavaScript medium
117. event delegation JavaScript medium
119. create a tokenizer JavaScript medium
122. implement memoizeOne()JavaScript medium
123. implement Promise.prototype.finally()JavaScript medium
124. calculate arithmetic expression JavaScript Algorithm medium
125. implement classNames()JavaScript medium
126. BigDecimal addition JavaScript Algorithm medium
127. BigDecimal subtraction JavaScript Algorithm medium
128. BigDecimal multiplication JavaScript Algorithm medium
129. BigDecimal Division JavaScript Algorithm medium
130. create LazyMan()JavaScript medium
131. implement _.chunk()JavaScript Lodash medium
132. the angle between hour hand and minute hand of a clock JavaScript medium
134. create your own Cookie JavaScript medium
135. localStorage with expiration JavaScript medium
136. find median of two sorted array JavaScript Algorithm medium
139. implement _.partial()JavaScript Lodash medium
143. Virtual DOM IV - JSX 1 JavaScript medium
144. serialize and deserialize data types not supported in JSON JavaScript medium
146. implement Array.prototype.reduce()JavaScript medium
149. interpolation JavaScript medium
150. Virtual DOM V - JSX 2 JavaScript medium
151. implement Array.prototype.map()JavaScript medium
152. Find Top k Elements JavaScript Algorithm medium
153. uglify CSS class names JavaScript medium
156. implement `_.set()`JavaScript Lodash medium
158. Previous Left Sibling JavaScript DOM medium
160. implement atob()JavaScript medium
161. toBe() or not.toBe()JavaScript medium
164. implement Immer produce()JavaScript medium
165. remove characters Algorithm medium
166. validate number string JavaScript Algorithm string medium
168. move zeros JavaScript Algorithm medium
169. LRU - Chrome storage automatic eviction JavaScript Algorithm medium
170. Generate CSS Selector for target element JavaScript medium
171. create callback on message channel JavaScript medium
172. implement `Math.clz32()`JavaScript medium
173. uncompress string JavaScript string algorithm medium
175. CSS Grid Layout auto-placement algorithm - dense JavaScript CSS medium
176. undefined to null JavaScript medium
177. Implement Object.groupBy()JavaScript medium