Funkcja mapy
const arr = [{name: "test"}, {name: "test1"}, {name: "test2"}]
arr.map((n, i) => {
console.log(n);
})
Code Sir
const arr = [{name: "test"}, {name: "test1"}, {name: "test2"}]
arr.map((n, i) => {
console.log(n);
})const numbers = [1, 2, 3, 4, 5];
const bigNumbers = numbers.map(number => {
return number * 10;
});The map() method creates a new array populated with the results of calling
a provided function on every element in the calling array.
const array1 = [1, 4, 9, 16];
// pass a function to map
const map1 = array1.map(x => x * 2);
console.log(map1);
// expected output: Array [2, 8, 18, 32]function map(array, transform) {
let mapped = [];
for (let element of array) {
mapped.push(transform(element));
}
return mapped;
}
let rtlScripts = SCRIPTS.filter(s => s.direction == "rtl");
console.log(map(rtlScripts, s => s.name));
// → ["Adlam", "Arabic", "Imperial Aramaic", …]let myMap = new Map()
let keyString = 'a string'
let keyObj = {}
// setting the values
myMap.set(keyString, "value associated with 'a string'")
myMap.set(keyObj, 'value associated with keyObj')
myMap.set(keyFunc, 'value associated with keyFunc')
myMap.size // 3
// getting the values
myMap.get(keyString) // "value associated with 'a string'"
myMap.get(keyObj) // "value associated with keyObj"
myMap.get(keyFunc) // "value associated with keyFunc"const myMap = new Map();
let userid = 1314124141;
myMap.set('veri_' + userid, 1) // set
myMap.set('veri_' + userid, myMap.get('veri_' + userid) + 1) // push
console.log(myMap.get('veri_' + userid)) // output: 3