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

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.
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                        summary
                        30-seconds-of-code has a medium active ecosystem.
                        summary
                        It has 108980 star(s) with 11246 fork(s). There are 2634 watchers for this library.
                        summary
                        It had no major release in the last 12 months.
                        summary
                        There are 0 open issues and 277 have been closed. On average issues are closed in 9 days. There are no pull requests.
                        summary
                        It has a neutral sentiment in the developer community.
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                        The latest version of 30-seconds-of-code is 1.2.3
                        30-seconds-of-code Support
                          Best in #Runtime Evironment
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                            30-seconds-of-code Support
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                                  kandi-Quality Quality

                                    summary
                                    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

                                              kandi-Security Security

                                                summary
                                                30-seconds-of-code has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
                                                summary
                                                30-seconds-of-code code analysis shows 0 unresolved vulnerabilities.
                                                summary
                                                There are 0 security hotspots that need review.
                                                30-seconds-of-code Security
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                                                          kandi-License License

                                                            summary
                                                            30-seconds-of-code is licensed under the CC-BY-4.0 License. This license is Permissive.
                                                            summary
                                                            Permissive licenses have the least restrictions, and you can use them in most projects.
                                                            30-seconds-of-code License
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                                                                        summary
                                                                        30-seconds-of-code releases are available to install and integrate.
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                                                                        Deployable package is available in npm.
                                                                        summary
                                                                        30-seconds-of-code saves you 3043 person hours of effort in developing the same functionality from scratch.
                                                                        summary
                                                                        It has 6559 lines of code, 0 functions and 400 files.
                                                                        summary
                                                                        It has low code complexity. Code complexity directly impacts maintainability of the code.
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                                                                                  30-seconds-of-code Examples and Code Snippets

                                                                                  30 seconds of code
                                                                                  JavaScriptdot imgLines of Code : 5dot imgLicense : Permissive (CC0-1.0)
                                                                                  copy iconCopy
                                                                                  
                                                                                                                      # 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?
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                                                                                  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 05:16

                                                                                  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

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