JS

What’s new in JavaScript

ES2022

1

Gaute Meek Olsen

2

JavaScriptECMAScriptESTC39ES6ES2015

3

Ecma internationalTC39

ECMAScript

JavaScript

ES6

===

ES2015

4

ES2022 (ES13)

5

Top-level await

(async () => {
  const response = await fetch('https://catfact.ninja/fact');
  const data = await response.json();
  console.log(data.fact);
})();

6

.at()

const list = ['🐯', '🐥', '🦞'];
const last = list[list.length - 1];
console.log(last);

7

Error cause

function save(data) {
  try { writeToFile(data); } catch (error) {
    throw new Error('Could not write to file');
  }
}

try {
  save('something');
} catch (error) {
  console.error(error);
}

8

Object.hasOwn

const human = {
  age: 5
}
console.log(human.hasOwnProperty('age'));

9

RegExp match indices

const match = /\d+/.exec('find the number 123 please');
const start = match.index;
console.log(start);

10

class - public field

class Robot {
  constructor() {
    this.name = 'Optimus Prime';
  };
}
const robot = new Robot();
console.log(robot.name);

11

class - private

class Robot {
  
}

12

class - static

class Robot {
  
}

13

Takk for meg!

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