// JavaScript Document
// start with strings, numbers and booleans
// let age = 100;
// let age2 = age;
// console.log(age, age2);
// age = 200;
// console.log(age, age2);
// let name = 'Wes';
// let name2 = name;
// console.log(name, name2);
// name = 'wesley';
// console.log(name, name2);
// Let's say we have an array
const players = ['Wes', 'Sarah', 'Ryan', 'Poppy'];
// and we want to make a copy of it.
const team = players;
console.log(players, team);
// You might think we can just do something like this:
// team[3] = 'Lux';
// however what happens when we update that array?
// now here is the problem!
// oh no - we have edited the original array too!
// Why? It's because that is an array reference, not an array copy. They both point to the same array!
// So, how do we fix this? We take a copy instead!
const team2 = players.slice();
// one way
// or create a new array and concat the old one in
const team3 = [].concat(players);
// or use the new ES6 Spread
const team4 = [...players];
team4[3] = 'heeee hawww';
console.log(team4);
const team5 = Array.from(players);
// now when we update it, the original one isn't changed
// The same thing goes for objects, let's say we have a person object
// with Objects
const person = {
name: 'Wes Bos',
age: 80
};
// and think we make a copy:
// const captain = person;
// captain.number = 99;
// how do we take a copy instead?
const cap2 = Object.assign({}, person, { number: 99, age: 12 });
console.log(cap2);
// We will hopefully soon see the object ...spread
// const cap3 = {...person};
// Things to note - this is only 1 level deep - both for Arrays and Objects. lodash has a cloneDeep method, but you should think twice before using it.
const wes = {
name: 'Wes',
age: 100,
social: {
twitter: '@wesbos',
facebook: 'wesbos.developer'
}
};
console.clear();
console.log(wes);
const dev = Object.assign({}, wes);
const dev2 = JSON.parse(JSON.stringify(wes));
Knowing how to use Javascript is useful to a web designer because it allows the website to be functional.
Link: http://techteach.us/Web2020/ZWeiJian/WCP/Labs/Lab_28/Lab_28.html
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