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mudssrali/cond-construct
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Inspired byElixir'scond this is a simpler alternative tolodash's_.cond
Install with npm or yarn via
yarn add cond-constructor
npm i cond-constructtypeCond=(pairs:Array<[boolean,unknown|(()=>unknown)]>,options?:{strict:boolean})=>unknown
importcondfrom'cond-construct'constvalue=cond([[false,'false'],[true,'true'],[true,'true but too late']])// value === 'true'
You can disable strict checking by passing options as the second argument:
importcondfrom'cond-construct'constvalue=cond([[false,'false'],[1,'truthy'],[true,'true but also too late']],{strict:false})// value === 'truthy'
Also works nicely with React components as you can have the values lazily evaluated by wrapping it in a function:
importcondfrom'cond-construct'constComponent=({ hasErrors, isNew, isLoading})=>(<>{cond([[isLoading,()=><Loading/>],[isNew,()=><Create/>],[hasErrors,()=><ShowErrors/>]])}</>)
- [] Handle multiple method executions
- [] Add more option for falsy value
As all predicates have to be evaluated before the right branch can be chosen, it can have a negative performance impact if you rely on heavy computations here. It's best have simple booleans and resort to_.cond for complex use cases.