BFE
.dev
buy us
a coffee
EN
Practice
Explore
EN
JavaScript Coding Questions
As a Front-End developer, JavaScript is the core skill of everything
Sort
Difficulty
Solved status
Company
Sort: most tried
tag: Algorithm
tag: JavaScript
113. Virtual DOM I
JavaScript
Algorithm
DOM
medium
18772 tried
10. first bad version
JavaScript
Algorithm
medium
15481 tried
58. get DOM tree height
JavaScript
Algorithm
DOM
medium
15369 tried
25. Reorder array with new indexes
JavaScript
Algorithm
easy
11587 tried
167. Intersection of unsorted arrays
JavaScript
Algorithm
easy
11357 tried
13. Implement a Queue by using Stack
JavaScript
Algorithm
medium
10766 tried
63. create `_.cloneDeep()`
JavaScript
Algorithm
Lodash
medium
10743 tried
162. find the single integer
JavaScript
Algorithm
easy
9544 tried
68. get DOM tags
JavaScript
Algorithm
DOM
medium
8506 tried
104. Traverse DOM level by level
JavaScript
Algorithm
DOM
medium
8427 tried
110. serialize and deserialize binary tree
JavaScript
Algorithm
medium
8391 tried
103. implement Math.sqrt()
JavaScript
Algorithm
medium
7566 tried
168. move zeros
JavaScript
Algorithm
medium
7242 tried
91. invert a binary tree
JavaScript
Algorithm
easy
5697 tried
47. reverse a linked list
JavaScript
Algorithm
easy
5212 tried
137. binary tree vertical traversal
JavaScript
Algorithm
hard?
5074 tried
163. integer to roman numerals
JavaScript
Algorithm
easy
4638 tried
24. create a Priority Queue in JavaScript
JavaScript
Algorithm
medium
4403 tried
66. remove duplicates from an array
JavaScript
Algorithm
medium
4270 tried
120. create `isPrime()`
JavaScript
Algorithm
easy
4061 tried
86. Generate Fibonacci Number
JavaScript
Algorithm
medium
3995 tried
112. remove duplicate characters in a string
JavaScript
Algorithm
string
medium
3990 tried
152. Find Top k Elements
JavaScript
Algorithm
medium
3984 tried
138. Intersection of two sorted arrays
JavaScript
Algorithm
easy
3901 tried
81. merge sorted arrays
JavaScript
Algorithm
easy
3764 tried
41. implement Merge Sort
JavaScript
Algorithm
medium
3734 tried
48. search first index with Binary Search(possible duplicate array)
JavaScript
Algorithm
easy
3687 tried
166. validate number string
JavaScript
Algorithm
string
medium
3524 tried
87. longest substring with unique characters
JavaScript
Algorithm
easy
3524 tried
43. implement Quick Sort
JavaScript
Algorithm
medium
3502 tried
55. highlight keywords in HTML string
JavaScript
Algorithm
medium
3458 tried
102. validate string of parentheses
JavaScript
Algorithm
string
easy
3263 tried
106. Find two numbers that sum up to 0
JavaScript
Algorithm
easy
3244 tried
109. implement `Math.pow()`
JavaScript
Algorithm
easy
3220 tried
40. implement Bubble Sort
JavaScript
Algorithm
easy
3124 tried
136. find median of two sorted array
JavaScript
Algorithm
medium
3042 tried
107. Find the largest difference
JavaScript
Algorithm
easy
2975 tried
169. LRU - Chrome storage automatic eviction
JavaScript
Algorithm
medium
2827 tried
49. search last index with Binary Search(possible duplicate array)
JavaScript
Algorithm
easy
2801 tried
82. find available meeting slots
JavaScript
Algorithm
medium
2672 tried
100. detect circle in linked list
JavaScript
Algorithm
easy
2596 tried
45. find the K-th largest element in an unsorted array
JavaScript
Algorithm
medium
2451 tried
50. search element right before target with Binary Search(possible duplicate array)
JavaScript
Algorithm
easy
2220 tried
111. Count palindromic substrings
JavaScript
Algorithm
string
medium
2122 tried
108. Implement a Stack by using Queue
JavaScript
Algorithm
medium
2103 tried
62. implement BigInt addition
JavaScript
Algorithm
easy
1996 tried
51. search element right after target with Binary Search(possible duplicate array)
JavaScript
Algorithm
easy
1949 tried
42. implement Insertion Sort
JavaScript
Algorithm
easy
1764 tried
44. implement Selection Sort
JavaScript
Algorithm
easy
1614 tried
75. implement BigInt subtraction
JavaScript
Algorithm
medium
1266 tried
124. calculate arithmetic expression
JavaScript
Algorithm
medium
726 tried
126. BigDecimal addition
JavaScript
Algorithm
medium
270 tried
128. BigDecimal multiplication
JavaScript
Algorithm
medium
196 tried
129. BigDecimal Division
JavaScript
Algorithm
medium
138 tried
127. BigDecimal subtraction
JavaScript
Algorithm
few challengers
87 tried