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Basic Javascript callback functions
/*
* Understanding basic Javascript callback functions
* By: Brandon Tillman
* Website: BrandonTillman.com
*/
(function(){
'use strict';
var callback_examples = {
// Calls back with a number that is 1-100
get_randomNumber: function(callback) {
var randomNumber = Math.floor((Math.random() * 100) + 1);
// Returns randomNumber to the anonymous function
callback(randomNumber);
},
// Calls back with a name via index
get_nameByIndex: function(index, callback) {
var names = [
"Foo",
"Bar",
"Mr.Callback"]
// Returns the name to the anonymous function
callback(names[index]);
}
};
// Helper function to log the results
function logResult(functionName, result) {
console.log("The result of %s is: %s", functionName, result);
};
// Call our functions
callback_examples.get_randomNumber(function(num) { // <-- Anonymous function with the callback
logResult("get_randomNumber", num);
});
callback_examples.get_nameByIndex(2, function(name){ // <-- Index along with anonymous function
logResult("get_nameByIndex", name);
});
})();
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