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juukie/promise.finally.polyfill.js

Forked from spiralx/promise.finally.polyfill.js
Created February 27, 2019 09:49
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Polyfill to add a finally() method to the Promise object
Raw
promise.finally.polyfill.js
Promise.prototype.finally = function (callback) {
return this.then(
value => this.constructor.resolve(callback()).then(() => value),
reason => this.constructor.resolve(callback()).then(() => { throw reason })
)
}
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