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// ==== Challenge 1: Write your own closure ====
// Write a simple closure of your own creation. Keep it simple!
const moduloNum = function(divisor) {
return function (dividend){
return dividend % divisor;
}
}
const moduloSix = moduloNum(6);// closure with value of 6
const moduloNine = moduloNum(9) //closure with value of 9
console.log("Challenge 1 Test 1: 7 mod 6",moduloSix(7));
console.log("Challenge 1 Test 2: 31 mod 9",moduloNine(31));
/* STRETCH PROBLEMS, Do not attempt until you have completed all previous tasks for today's project files */
// ==== Challenge 2: Create a counter function ====
const counter = () => {
// Return a function that when invoked increments and returns a counter variable.
let num = 0;
function innerCounter(){
console.log(num);
num++;
}
return innerCounter;
};
const newCounter = counter();
newCounter();
newCounter();
newCounter();
// Example usage: const newCounter = counter();
// newCounter(); // 1
// newCounter(); // 2
// ==== Challenge 3: Create a counter function with an object that can increment and decrement ====
const counterFactory = () => {
// Return an object that has two methods called `increment` and `decrement`.
// `increment` should increment a counter variable in closure scope and return it.
// `decrement` should decrement the counter variable and return it.
let num = 0; // initial value is zero
return {
increment: function(){
num++
//console.log(num);
return num;
},
decrement: function(){
num--
//console.log(num);
return num;
}
};
};
console.log("Challenge 3 Alternate: Create Counter Function with an Object that can increment and decrement")
const myCounter = counterFactory();
console.log("Decrement:",myCounter.decrement());
console.log("Increment:",myCounter.increment());
console.log("Increment:",myCounter.increment());
console.log("Decrement:",myCounter.decrement());
console.log("Increment:",myCounter.increment());
// ==== Challenge 3 Alternate: Counter function with an object that increment and decrement an initial value ====
const counterFactory2 = (number) => {
// Return an object that has two methods called `increment` and `decrement`.
// `increment` should increment a counter variable in closure scope and return it.
// `decrement` should decrement the counter variable and return it.
return {
increment: function(){
number++
//console.log(num);
return number;
},
decrement: function(){
number--;
//console.log(num);
return number;
}
};
};
console.log("Challenge 3 Alternate Solution: Create Counter Function with an Object that can increment and decrement")
const myCounter2 = counterFactory2(2);
console.log("Decrement:",myCounter2.decrement());
console.log("Increment:",myCounter2.increment());
console.log("Increment:",myCounter2.increment());
console.log("Decrement:",myCounter2.decrement());
console.log("Increment:",myCounter2.increment());