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callback-vs-nocallback-1.js
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callback-vs-nocallback-1.js
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// Function biasa tanpa Callback
let calc1 = function(num1, num2, calcType){
if(calcType === "add"){
return num1 + num2;
} else if(calcType === "multiply"){
return num1 * num2;
}
}
console.log(calc1(2,3,"add"));
console.log(calc1(2,3,"multiply"));
// output:
// 5
// 6
//—---------------------------------------------------------------------
// Function dengan Callback
let add = function(a, b){
return a + b;
};
let multiply = function(a, b){
return a * b;
};
let doWhatever = function(a, b){
return `Here are your numbers: ${a} and ${b}`;
}
let calc2 = function(num1, num2, callback){
if(typeof callback === "function"){
return callback(num1, num2);
} else {
return `The callback is not a function, it is ${typeof callback}`;
}
}
console.log(calc2(2, 3, add));
console.log(calc2(2, 3, multiply));
console.log(calc2(2, 3, doWhatever));
console.log(calc2(2, 3, function(a, b){return a - b;}));
console.log(calc2(2, 3, [1,2,3]));
console.log(calc2(2, 3, 4));
// output:
// 5
// 6
// "Here are your numbers: 2 and 3"
// -1
// "The callback is not a function, it is object"
// "The callback is not a function, it is number"