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September 2, 2015 20:33
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Just an a demonstration of error catching with promises.
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function loggedFrom(from) { | |
return function(arg) { | |
console.log(from, arg); | |
} | |
} | |
var loggedFromCatch = loggedFrom('catch: '); | |
var loggedFromCallback = loggedFrom('second Callback: '); | |
function doSomething() { | |
return new Promise(function(resolve, reject) { | |
resolve('hello'); | |
}); | |
} | |
function doSomethingAndFail() { | |
return new Promise(function(resolve, reject) { | |
throw 'oh noes! orignal promise error' | |
resolve('hello'); | |
}); | |
} | |
// second callback not called | |
doSomething().then(function(val) { | |
throw 'error from 1st callback'; | |
}, function(err) { | |
loggedFromCallback(err); | |
}); | |
doSomething().then(function(val) { | |
throw 'error from 1st callback'; | |
}).catch(function(err) { | |
loggedFromCatch(err); | |
return err; | |
}); | |
doSomethingAndFail().then(function(val) { | |
// do stuff | |
}, function(err) { | |
loggedFromCallback(err); | |
}); | |
doSomethingAndFail().then(function(val) { | |
// do stuff | |
}).catch(function(err) { | |
loggedFromCatch(err); | |
return err; | |
}); |
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