map filter js code example
Example 1: use .map(), .filter() js
var arr = [1, 25, 20, 4];
var sum = arr.map((item) => item * 10).filter((item) => item > 100);
var sum2 = arr.map((item) => item * 10)
console.log("sum2", sum2)
console.log("sum", sum);
Example 2: map and reduce an array in js
const rebels = pilots.filter(pilot => pilot.faction === "Rebels");const empire = pilots.filter(pilot => pilot.faction === "Empire");
Example 3: map&filter
const files = [ 'foo.txt ', '.bar', ' ', 'baz.foo' ];
const filePaths = files
.map(file => file.trim())
.filter(Boolean)
.map(fileName => `~/cool_app/${fileName}`);
Example 4: map&filter
const files = [ 'foo.txt ', '.bar', ' ', 'baz.foo' ];
const filePaths = files.reduce((acc, file) => {
const fileName = file.trim();
if(fileName) {
const filePath = `~/cool_app/${fileName}`;
acc.push(filePath);
}
return acc;
}, []);