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February 19, 2022 20:51
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| const error = null ; | |
| //const error = 'error' ; // change to a truthy value to reject promise. | |
| const promise = new Promise( ( resolve, reject ) => { | |
| //asynchronous operation | |
| setTimeout( () => { | |
| return error ? reject( error ) : resolve( 'final data' ) ; | |
| }, 3000 ); | |
| } ); | |
| // before 3 seconds: | |
| Promise {<pending>} | |
| [[PromiseState]]: "pending" | |
| [[PromiseResult]]: undefined | |
| //resolved after 3 seconds : | |
| Promise {<fulfilled>: 'final data'} | |
| [[PromiseState]]: "fulfilled" | |
| [[PromiseResult]]: "final data" | |
| //rejected after 3 seconds : | |
| Promise {<rejected>: 'error'} | |
| [[PromiseState]]: "rejected" | |
| [[PromiseResult]]: "error" |
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