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This is a playground to test JavaScript. It runs a completely standard copy of Node.js on a virtual server created just for you. Every one of npm’s 300,000+ packages are pre-installed, so try it out:
var async = require('async');
try {
async.waterfall([function1, function2], myAsyncCallback);
}
catch(err) {
errorHandler(err);
}
function function1(callback) {
console.log('in fn1')
callback(null,'fn1');
}
function function2(fn1, callback) {
console.log('in fn2')
callback(null, fn1 + 'fn2');
}
function myAsyncCallback(err, result) {
if (err) {
console.error('There was an error: ' + err);
return;
}
//an error occurs. this gets caught by the outer try block
//var foo = outer; //oops, outer is not defined. This throws an error
//same scenario but inside an async function
//can't/won't be caught by the outer try block
setTimeout(function(){
try{ //need try here
var foo = inner; //oops, inner is not defined. This throws an error
}
catch(err) {
errorHandler(err);
}
}, 1000);
console.log('Result was: ' + result);
}
function errorHandler(err){
//Make error handler a function that can be called from either catch
console.log('caught error: ' + err);
}
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