Questions tagged [ecmascript-6]
ECMAScript 6 reached feature complete status in 2014. The features vary widely from completely new objects and patterns to syntax changes to new methods on existing objects.
3
votes
2answers
65 views
RegEx version control
this is my first time on this stack exchange :)
I created a little script to check for the latest version of specified API version available, but I am wondering if I am using the best way possible ...
3
votes
3answers
34 views
Simple javascript code to create an image caption
I'm trying to become better at javascript and have written a simple script that just creates some html from getting some details from some elements (e.g. the image alt text) and inserts it onto the ...
6
votes
4answers
912 views
Find all letter Combinations of a Phone Number
The task
is taken from LeetCode
Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. A
mapping of digit to letters (just ...
0
votes
0answers
43 views
Merge Two Sorted Lists in JavaScript
The task is taken from LeetCode
Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two
lists.
...
4
votes
0answers
61 views
Merge Intervals in JavaScript
This task is taken from Leetcode -
Given a collection of intervals, merge all overlapping intervals.
Example 1:
...
2
votes
3answers
58 views
Jewels and Stones
The task
is taken from leetcode
You're given strings J representing the types of stones that are
jewels, and S representing the stones you have. Each character in S
is a type of stone you ...
1
vote
1answer
41 views
Number of Islands
The task
is taken from leetcode
Given a 2d grid map of '1's (land) and '0's (water), count the number
of islands. An island is surrounded by water and is formed by
connecting adjacent lands ...
2
votes
1answer
50 views
Length of the longest consecutive run of 1s in its binary representation
The task
Given an integer n, return the length of the longest consecutive run
of 1s in its binary representation.
For example, given 156, you should return 3
My function solution 1
Style 1
...
4
votes
2answers
65 views
Static site generator using JavaScript Promises
I have created a small static site generator (for learning purposes) in Javascript ES6, using Promises, but I am not certain of how to use them well. The code below works fine, but I wonder if i can't ...
3
votes
1answer
53 views
Longest Consecutive Sequence
This task is taken from Leetcode -
Given an unsorted array of integers, find the length of the longest
consecutive elements sequence.
Your algorithm should run in \$O(n)\$ complexity.
...
0
votes
1answer
26 views
Daily Temperatures
The task
is taken from leetcode
Given a list of daily temperatures T, return a list such that, for
each day in the input, tells you how many days you would have to wait
until a warmer ...
4
votes
1answer
57 views
Encode and Decode TinyURL
The task
is taken from leetcode
TinyURL is a URL shortening service where you enter a URL such as
https://leetcode.com/problems/design-tinyurl and it returns a short
URL such as http://tinyurl....
1
vote
2answers
84 views
Find out whether number is of Power of Two
The task
is taken from leetcode
Given an integer, write a function to determine if it is a power of
two.
Example 1:
Input: 1
Output: true
Explanation: 20 = 1
Example 2:
...
1
vote
1answer
36 views
Reverse Vowels of a String
The task
is taken from leetcode
Write a function that takes a string as input and reverse only the
vowels of a string.
Example 1:
Input: "hello"
Output: "holle"
Example 2:
...
3
votes
2answers
67 views
Add one to the last array element
The task
is taken from leetcode
Given a non-empty array of digits representing a non-negative integer,
plus one to the integer.
The digits are stored such that the most significant digit is ...
3
votes
1answer
53 views
Addition of Strings
The task
is taken from leetcode
Given two non-negative integers num1 and num2 represented as string,
return the sum of num1 and num2.
Note:
The length of both num1 and num2 is < ...
20
votes
4answers
3k views
Count all vowels in string
For a homework assignemnt, I was asked to complete this CodeStepByStep problem. It's coded correctly and gave me a right answer. I'm just wondering if there's an easier way to solve this problem ...
1
vote
2answers
78 views
First Unique Character in a String
The task
is taken from leetcode
Given a string, find the first non-repeating character in it and
return it's index. If it doesn't exist, return -1.
Examples:
s = "leetcode"
return ...
2
votes
2answers
51 views
Find All Numbers Disappeared in an Array
The task
is taken from leetcode
Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array),
some elements appear twice and others appear once.
Find all the elements of [1, n] ...
4
votes
1answer
134 views
Island Perimeter
The task
is taken from leetcode
You are given a map in form of a two-dimensional integer grid where 1
represents land and 0 represents water.
Grid cells are connected horizontally/vertically ...
2
votes
1answer
41 views
Find Median of Two Sorted Arrays in JS
The task
is taken from leetcode
There are two sorted arrays nums1 and nums2 of size m and n
respectively.
Find the median of the two sorted arrays. The overall run time
complexity should ...
4
votes
2answers
78 views
Create a min stack
The task
is taken from leetcode
Design a stack that supports push, pop, top, and retrieving the
minimum element in constant time.
push(x) -- Push element x onto stack.
pop() -- Removes ...
4
votes
0answers
54 views
Given a string containing just parentheses, determine if the input string is valid
The task
is taken from leetcode
Given a string containing just the characters '(', ')', '{', '}', '['
and ']', determine if the input string is valid.
An input string is valid if:
...
2
votes
1answer
57 views
Unique Email Addresses
The task
was taken from leetcode
Every email consists of a local name and a domain name, separated by
the @ sign.
For example, in alice@leetcode.com, alice is the local name, and
leetcode....
5
votes
1answer
77 views
Container with most water
The task
is taken from leetcode
Given n non-negative integers a1, a2, ..., an , where each represents
a point at coordinate (i, ai). n vertical lines are drawn such that
the two endpoints of ...
4
votes
3answers
129 views
Reverse Integer
The task
is taken from leetcode
Given a 32-bit signed integer, reverse digits of an integer.
Example 1:
Input: 123
Output: 321
Example 2:
...
1
vote
2answers
96 views
Longest Substring Without Repeating Characters in JS
The task
is taken from leetcode
Given a string, find the length of the longest substring without
repeating characters.
Example 1:
Input: "abcabcbb"
Output: 3
Explanation: ...
1
vote
3answers
76 views
Add Two Numbers
The task
is taken from leetcode
You are given two non-empty linked lists representing two non-negative
integers. The digits are stored in reverse order and each of their
nodes contain a single ...
1
vote
1answer
52 views
Find common characters (LeetCode)
The task
is taken from leetcode
Given an array A of strings made only from lowercase letters, return a
list of all characters that show up in all strings within the list
(including duplicates). ...
3
votes
2answers
44 views
Robot Return to Origin
The task
is taken from leetcode
There is a robot starting at position (0, 0), the origin, on a 2D
plane. Given a sequence of its moves, judge if this robot ends up at
(0, 0) after it completes ...
3
votes
1answer
74 views
TamperMonkey Script to replace the YouTube favicon with the channel logo
I felt that having a plain red favicon for every youtube tab is a little boring. So, I wrote a TamperMonkey Script with the new ES6 promises that replaces the favicon with the channel's logo. Link to ...
1
vote
2answers
43 views
Flipping an Image
The task
is taken from leetcode
Given a binary matrix A, we want to flip the image horizontally, then
invert it, and return the resulting image.
To flip ...
1
vote
2answers
45 views
Combining arbitrary number of lists inside json
I have some JSON where each key stores an array, and I need to combine all those arrays into a single array. My current solution doesn't seem the most friendly to review, but without ...
0
votes
0answers
33 views
Split string into as few substrings as possible such that each substring is a palindrome
The task
Given a string, split it into as few strings as possible such that
each string is a palindrome.
For example, given the input string racecarannakayak, return
["racecar", "anna", "...
3
votes
3answers
78 views
Rotate a linked list to the right by k places
The task
Given a linked list and a positive integer k, rotate the list to the
right by k places.
For example, given the linked list 7 -> 7 -> 3 -> 5 and k = 2, it
should become 3 -> 5 -> 7 ...
1
vote
1answer
67 views
Sort Array By Parity
The task is taken from leetcode
Given an array A of non-negative integers, return an array consisting
of all the even elements of A, followed by all the odd elements of A.
You may return any ...
2
votes
2answers
49 views
N-Repeated Element in Size 2N Array
The task
is taken from leetcode
In a array A of size 2N, there are N+1 unique elements, and exactly
one of these elements is repeated N times.
Return the element repeated N times.
...
0
votes
1answer
24 views
Items also occurs in a set
The task
You're given strings J representing the types of stones that are
jewels, and S representing the stones you have. Each character in S
is a type of stone you have. You want to know how ...
4
votes
3answers
430 views
Determine whether an integer is a palindrome
The task
Determine whether an integer is a palindrome. An integer is a
palindrome when it reads the same backward as forward.
Example 1:
Input: 121 Output: true
Example 2:
...
2
votes
0answers
67 views
Determine whether there exists a one-to-one character mapping from one string to another
The task
Determine whether there exists a one-to-one character mapping from one
string s1 to another s2.
For example, given s1 = abc and s2 = bcd, return true since we can map
a to b, b to ...
2
votes
3answers
76 views
Find non-duplicated integer in a list where every integer occurs three times except for one integer
The task
Given an array of integers where every integer occurs three times
except for one integer, which only occurs once, find and return the
non-duplicated integer.
For example, given [6,...
3
votes
1answer
83 views
Division without using division, multiplication, or modulus operators
The task
Implement division of two positive integers without using the
division, multiplication, or modulus operators. Return the quotient as
an integer, ignoring the remainder.
My solution
<...
2
votes
1answer
52 views
Using IndexedDB as an in-browser cache
In my site:
Users have many Activities
Each Activity has encoded_polyline data
I display these encoded_polylines on a map
I want to use IndexedDB (via Dexie) as an in-browser cache so that they don'...
1
vote
2answers
49 views
Sum of two numbers in array
The task
You are given two non-empty arrays representing two non-negative
integers. The digits are stored in reverse order and each of their
items contain a single digit. Add the two numbers ...
1
vote
1answer
71 views
Find busiest period in building
The task
You are given a list of data entries that represent entries and exits
of groups of people into a building. An entry looks like this:
{"timestamp": 1526579928, count: 3, "type": "...
0
votes
1answer
44 views
Find indices of two numbers such that they add up to a target
The task
...is taken from leetcode
Given an array of integers, return indices of the two numbers such
that they add up to a specific target.
You may assume that each input would have ...
1
vote
0answers
62 views
Find all pairs of unique indices in a list such that the concatenation of the two words is a palindrome
The task
Given a list of words, find all pairs of unique indices such that the
concatenation of the two words is a palindrome.
For example, given the list ["code", "edoc", "da", "d"], return ...
1
vote
1answer
136 views
User upload & Drag image and update text
I am allowing user to upload images & drag uploaded image once user click on mask images, also gave an option to Edit the text....
I am fetching mask images and text from json file....
I am ...
3
votes
1answer
93 views
AWS Lambda function to update newly added DynamoDB records
Approach
All data is submitted into my DynamoDB from another Lambda > API Integration function whereas the lastUpdated row gets inserted as ...
3
votes
1answer
81 views
React code to build shopping cart
I have built a basic shopping cart simulator. All it does is add and remove items between two different basket (i.e. aisle vs basket).
While working on the problem I started to think about the ...
