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offero/wrapcallbackinpromise.js

Created November 24, 2016 17:20
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  1. offero created this gist Nov 24, 2016.
    21 changes: 21 additions & 0 deletions wrapcallbackinpromise.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,21 @@
    function doThingThatReturnsPromise(arg1) {
    return new Promise(function(resolve, reject) {
    fnThatDoesTheThingButAcceptsACallback(arg1, function callback(err, result) {
    if(err) {
    // the callback was called with an error
    return reject(err);
    }
    // the callback was called with a result
    resolve(result);
    });
    });
    }

    // cool es6 function version
    function doThingThatReturnsPromiseES6(arg1) {
    return new Promise((resolve, reject) => {
    fnThatDoesTheThingButAcceptsACallback(arg1, (err, result) => {
    err && reject(err) || resolve(result);
    });
    });
    }