es6 map code example
Example 1: array map javascript
const array1 = [1, 4, 9, 16];
const map1 = array1.map(x => x * 2);
console.log(map1);
Example 2: javascript map
array.map((item) => {
return item * 2
}
Example 3: maps in javascript
const obj1 = { name: 'ismail' };
const obj2 = { name: 'sulman' };
const obj3 = { name: 'naeem' };
firstMap = new Map([
[
[obj1, [{ date: 'yesterday', price: '10$' }]],
[obj2, [{ date: 'today', price: '100$' }]]
]
]);
firstMap.set(obj3, [{ date: "yesterday", price: '150$' }]);
for (const entry of firstMap.entries()) {
console.log(entry);
};
console.log(firstMap);
firstMap.delete(obj3);
console.log(firstMap);
Example 4: javascript map
const myArray = ['Sam', 'Alice', 'Nick', 'Matt'];
const newArray = myArray.map(name => {
return 'My name is ' + name;
});
console.log(newArray);
const anotherArray = myArray.map((value, index) => index + ": " + value);
console.log(anotherArray);
console.log(myArray);
Example 5: javascript map function
let array = [1, 4, 9, 16];
array.map(num => num * 2);
array.map(pounds => `£${pounds}.00`);
array.map(item => Math.sqrt(item));
Example 6: initialize a map js
let map = new Map()
map['bla'] = 'blaa'
map['bla2'] = 'blaaa2'
console.log(map)