30-seconds-of-code | Short JavaScript code snippets for all your development | Runtime Evironment library
kandi X-RAY | 30-seconds-of-code Summary
30-seconds-of-code is a JavaScript library typically used in Server, Runtime Evironment, Nodejs applications. 30-seconds-of-code has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can install using 'npm i 30-seconds-of-code' or download it from GitHub, npm.
Short JavaScript code snippets for all your development needs.
Support
Quality
Security
License
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Support
Quality
Security
License
Reuse
Support
30-seconds-of-code has a medium active ecosystem.
It has 108980 star(s) with 11246 fork(s). There are 2634 watchers for this library.
It had no major release in the last 12 months.
There are 0 open issues and 277 have been closed. On average issues are closed in 9 days. There are no pull requests.
It has a neutral sentiment in the developer community.
The latest version of 30-seconds-of-code is 1.2.3
30-seconds-of-code Support
Best in #Runtime Evironment
Average in #Runtime Evironment
30-seconds-of-code Support
Best in #Runtime Evironment
Average in #Runtime Evironment
Quality
30-seconds-of-code has 0 bugs and 0 code smells.
30-seconds-of-code Quality
Best in #Runtime Evironment
Average in #Runtime Evironment
30-seconds-of-code Quality
Best in #Runtime Evironment
Average in #Runtime Evironment
Security
30-seconds-of-code has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
30-seconds-of-code code analysis shows 0 unresolved vulnerabilities.
There are 0 security hotspots that need review.
30-seconds-of-code Security
Best in #Runtime Evironment
Average in #Runtime Evironment
30-seconds-of-code Security
Best in #Runtime Evironment
Average in #Runtime Evironment
License
30-seconds-of-code is licensed under the CC-BY-4.0 License. This license is Permissive.
Permissive licenses have the least restrictions, and you can use them in most projects.
30-seconds-of-code License
Best in #Runtime Evironment
Average in #Runtime Evironment
30-seconds-of-code License
Best in #Runtime Evironment
Average in #Runtime Evironment
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30-seconds-of-code releases are available to install and integrate.
Deployable package is available in npm.
30-seconds-of-code saves you 3043 person hours of effort in developing the same functionality from scratch.
It has 6559 lines of code, 0 functions and 400 files.
It has low code complexity. Code complexity directly impacts maintainability of the code.
30-seconds-of-code Reuse
Best in #Runtime Evironment
Average in #Runtime Evironment
30-seconds-of-code Reuse
Best in #Runtime Evironment
Average in #Runtime Evironment
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30-seconds-of-code Key Features
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30-seconds-of-code Examples and Code Snippets
# 使用 npm 安装 npm install 30-seconds-of-code # 使用 yarn 安装 yarn add 30-seconds-of-code
Community Discussions
Trending Discussions on 30-seconds-of-code
What is the role of parentheses in this javascript expression?
Trending Discussions on 30-seconds-of-code
QUESTION
What is the role of parentheses in this javascript expression?
Asked 2021-Oct-01 at 05:36
I came across this short snippet (HERE)
const pick = (obj, arr) =>
arr.reduce((acc, curr) => (curr in obj && (acc[curr] = obj[curr]), acc), {});
And I don't understand the role of parentheses in this part
(curr in obj && (acc[curr] = obj[curr]), acc)
() => (... && (... = ...), ...)
// First, parentheses after the arrow function means we are returning what is inside
() => (...)
// This looks like a short if statement
curr in obj && ...
// Why are we grouping the assignment into parentheses here?
(acc[curr] = obj[curr])
// What does (..., ...) is supposed to to
() => (... && (...), acc)
ANSWER
Answered 2021-Oct-01 at 05:16The parentheses are required because otherwise, this expression:
curr in obj && acc[curr] = obj[curr]
would be invalid syntax, because the left-hand side of the =
would evaluate to curr in obj && acc[curr]
(an expression), not a reference that can be assigned to.
But this is horrible code - it's quite confusing. A much better version would be
const pick = (obj, arr) => {
const output = {};
for (const curr of arr) {
if (curr in obj) {
output[curr] = obj[curr]
}
}
return output;
};
That's so much easier to understand at a glance, isn't it?
Another option is to filter the entries of the object:
const pick = (obj, arr) => Object.fromEntries(
Object.entries(obj)
.filter(([key]) => arr.includes(key))
);
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install 30-seconds-of-code
You can install using 'npm i 30-seconds-of-code' or download it from GitHub, npm.
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