30-seconds-of-code | Short JavaScript code snippets for all your development | Runtime Evironment library

by 30-seconds JavaScript Version: 1.2.3 License: CC-BY-4.0

X-Ray Key Features Code Snippets(1)Community Discussions(1)Vulnerabilities Install Support

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

Reuse

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

Reuse

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 Examples and Code Snippets

30 seconds of code

JavaScript

Lines of Code : 5

License : Permissive (CC0-1.0)

Copy


                                    # 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

What is the role of parentheses in this javascript expression?

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 05:16

The 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))
);

Source https://stackoverflow.com/questions/69400736

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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