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functions.js
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functions.js
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// rest parameters
function max(first, ...rest) {
let maxValue = first;
for(let n of rest) {
if (n > maxValue) {
maxValue = n;
}
}
return maxValue;
}
//function property
uniqueInteger.counter = 0;
function uniqueInteger() {
return uniqueInteger.counter++;
}
//Closure
let uniqueInteger = (function() {
let counter = 0;
return function() { return counter++; };
}());
uniqueInteger();
uniqueInteger();
//High order function
function compose(f,g) {
return function(...args) {
return f.call(this, g.apply(this.args));
};
}
//Memoization
const memoize = () => {
let cache = {};
return (n) => {
if (n in cache) {
console.log('Fetching from cache');
return cache[n];
}
else {
console.log('Calculating result');
let result = n + 10;
cache[n] = result;
return result;
}
}
}
const addMemo = memoize();
addMemo(2); // Calculating result..
addMemo(3); // Calculating result..
addMemo(2); // Fetching from cache..