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only pass a reference to the function #5

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Merged
merged 1 commit into from
Dec 20, 2018
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only pass a reference to the function #5

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only pass a reference to the function 
this is conceptually wrong since the SetTimeout is going to exectue the callback immediately and the function never gets passed in the callback queue.

solution, leverage closure and set the database[id] in a global variable. 

var dataReceived;
var data; // is undefined at first

function ajaxSimulate(id, callback) {
    var database = ['Aaron', 'Barbara', 'Chris'];
    data = database[id]	
    setTimeout(callback, 0); 
}

function storeData() {
    dataReceived = data;
	console.log(dataReceived);
}

ajaxSimulate(1, storeData);
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@leonardofed authored Dec 18, 2018
commit 96d7846b892c2e4ec37040c494b4ac21fa65b4e6
6 changes: 4 additions & 2 deletions 2018-01-22-javascript-hard-parts/fem-JavaScriptTheHardParts-AsynchronicitySolutions.js
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Original file line number Diff line number Diff line change
Expand Up @@ -150,10 +150,12 @@ console.log('End of Challenge 5');
//CHALLENGE 6//
console.log('Start of Challenge 6');
var dataReceived;
var data; // is undefined at first

function ajaxSimulate(id, callback) {
var database = ['Aaron', 'Barbara', 'Chris'];
setTimeout(callback(database[id]), 0);
var data = database[id]
setTimeout(callback, 0);
}

function storeData(data) {
Expand Down Expand Up @@ -242,4 +244,4 @@ function dataHandler(data) {
$("#ch4").slice(0, -1); //takes off the extra comma
}

console.log('End of Challenge 9');
console.log('End of Challenge 9');