ecmascript-6

问题 I found myself needing to do camel case to sentence case string conversion with sane acronym support, a google search for ideas led me to the following SO post: Convert camelCaseText to Sentence Case Text Which is actually asking about title case not sentence case so I came up with the following solution which maybe others will find helpful or can offer improvements to, it is using ES6 which is acceptable for me and can easily be polyfilled if there's some horrible IE requirement. 回答1: The

问题 I've been searching an answer for that but didn't found it. I have an array like: const data2 = [{ "abc":{ companyCity:"Cupertino", conpanyName:"Apple" } }, { "def":{ companyCity:"Mountain View", conpanyName:"Google" } } ] And I'd like to convert to and array like omiting the parent keys: const data3 = [ { companyCity:"Cupertino", companyName:"Apple", }, { companyCity:"Mountain View", companyName:"Google" } ] Perhaps, libraries like lodash have a method to achieve that, but didn't find it.

问题 I've got an object array which I have to group and sort: [ { id: 123, group: 'abc', metadata: { name: 'tom' }, date: ISODate("2019-07-08T20:33:40.475Z") }, { id: 456, group: 'def', metadata: { name: 'bob' }, date: ISODate("2019-07-08T20:33:40.475Z") }, { id: 789, group: 'def', metadata: { name: 'bob' }, date: ISODate("2019-07-10T20:33:40.475Z") }, { id: 234, group: 'ghi', metadata: { name: 'frank' }, date: ISODate("2019-07-10T20:33:40.475Z") }, { id: 567, group: 'abc', metadata: { name: 'tom'

问题 This question already has answers here : What are the rules for JavaScript's automatic semicolon insertion (ASI)? (6 answers) Closed 1 year ago . I've just noticed a strange error when using Javascript destructuring assignment, which took me some guesswork to resolve. I'm posting here so I can show what I learned. (I accept that the question about Javascript semicolon insertion is answered by What are the rules for JavaScript's automatic semicolon insertion (ASI)?, but my problem was about

问题 This question already has answers here : What are the rules for JavaScript's automatic semicolon insertion (ASI)? (6 answers) Closed 1 year ago . I've just noticed a strange error when using Javascript destructuring assignment, which took me some guesswork to resolve. I'm posting here so I can show what I learned. (I accept that the question about Javascript semicolon insertion is answered by What are the rules for JavaScript's automatic semicolon insertion (ASI)?, but my problem was about

问题 given time_cancel = 2019-01-06T23:29:35.000Z, would like to format it to month dd, yyyy (in this example, it is January 06, 2019) In the following code, I have to write 12 if else block to convert mm to month i.e. in this case, is to convert 01 to January. is there a better /faster way to convert time_cancel to format month dd, yyyy in Javascript or Typescript/es6/react. Thanks in advance! let date = time_cancel.split("T")[0]; var dateArray = date.split("-"); var month; // 12 if else code if

问题 given time_cancel = 2019-01-06T23:29:35.000Z, would like to format it to month dd, yyyy (in this example, it is January 06, 2019) In the following code, I have to write 12 if else block to convert mm to month i.e. in this case, is to convert 01 to January. is there a better /faster way to convert time_cancel to format month dd, yyyy in Javascript or Typescript/es6/react. Thanks in advance! let date = time_cancel.split("T")[0]; var dateArray = date.split("-"); var month; // 12 if else code if

问题 If I have a set of objects, like const s = new Set(); s.add({a: 1, b: 2}); s.add({a: 2, b: 2}); and I will do s.has({a: 1, b: 2}); Will I have a positive result? How does Set handle reference types? Is there a way to tell it to use custom checker/predicate? 回答1: It's expected that any native JavaScript API compare objects by their references and not their contents (including shallow comparison): ({a: 1, b: 2}) !== ({a: 1, b: 2}) Set isn't an exclusion, it does === comparison for every value

问题 Hi I am working with an API that retrieves the URL of an image. I am then trying to pass that URL into an tag as follows: <img class="img-fluid" src={this.state.representatives[i].pic}/> Locally I am met with But when I try to use the app on AWS Amplify, I am met with: I have tried hardcoding the URL into the app but it returns the same error. I am really confused where to go from here. For example the image URL pulled from the API for Mark Warner is http://bioguide.congress.gov/bioguide

问题 Hi I am working with an API that retrieves the URL of an image. I am then trying to pass that URL into an tag as follows: <img class="img-fluid" src={this.state.representatives[i].pic}/> Locally I am met with But when I try to use the app on AWS Amplify, I am met with: I have tried hardcoding the URL into the app but it returns the same error. I am really confused where to go from here. For example the image URL pulled from the API for Mark Warner is http://bioguide.congress.gov/bioguide