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ashwinkumar2438/finally.js

Last active February 26, 2022 12:02
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finally.js
class PromiseCopy{
finally( callback ){
// resolveOrReject : forward current #state.
// value : forward current #result.
/** curried function to pass Promise.resolve or
Promise.reject forward based on current Promise #state. **/
const commonCallback = ( resolveOrReject ) => ( value ) => {
const response = callback?.() ;
return Promise.resolve( response ).then( _ => resolveOrReject( value ) );
}
return this.then( commonCallback( Promise.resolve ) , commonCallback( Promise.reject ) );
}
}
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