Created
January 16, 2021 13:30
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| class SyncPromise { | |
| constructor( callback ) { | |
| try{ | |
| this.returnValue = callback(); | |
| } | |
| catch(err) { | |
| throw err; | |
| } | |
| } | |
| then(callback) { | |
| callback(this.returnValue); | |
| } | |
| } | |
| undefined | |
| new SyncPromise((resolve, reject) => { return 'hello'}).then(value => console.log(value.toUpperCase())) |
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