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hof2.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
var data = [4,3,9,7,6,2];
// Write Once --> OCP
function filter(nos, action) {
var result = [];
for(var i = 0 ; i <nos; i++) {
if(action(nos[i])) {
result.push(nos[i]);
}
}
return result;
}
function isEven(e) {
return e % 2 === 0;
}
var evens = filter(data, isEven);
function isOdd(e) {
return e % 2 !== 0;
}
var odss = filter(data, isOdd);
var products = [
{ "id": 1, "name": "iPhone", "price": 124447.44, "category": "mobile" },
{ "id": 2, "name": "Onida", "price": 4444.44, "category": "tv" },
{ "id": 3, "name": "OnePlus 6", "price": 98444.44, "category": "mobile" },
{ "id": 4, "name": "HDMI connector", "price": 2444.00, "category": "computer" },
{ "id": 5, "name": "Samsung", "price": 68000.00, "category": "tv" }
];
function isMobile(p) {
return p.category === 'mobile';
}
var mobiles = filter(products, isMobile);
// Map ==> transform the data
function map(elems, transformFn) {
var result = [];
for(var i = 0 ; i < elems.length; i++) {
result.push(transformFn(elems[i]));
}
return result;
}
function doubleIt(e) {
return e * 2;
}
// [4,3,9,7,6,2];
var result = map(data, doubleIt);
// result = [8, 6 , 18, 14, 12, 4]
</script>
</body>
</html>