// 81- USE THE REST OPERATOR WITH FUNCTION PARAMETERS
// const sum2 = (function(){
// return function sum2(x, y, z){
// const args = [x, y, z];
// return args.reduce((a,b) => a + b, 0);
// };
// })();
const sum2 = (function(){
return function sum2(...args){
return args.reduce((a,b) => a + b, 0);
};
})();
console.log("Rest operator with function parameters: ...args");
console.log(sum2(1, 2, 3, 4));
// 82- USE THE SPREAD OPERATOR TO EVALUATE ARRAYS IN PLACE ...
// const arr1 = ['JAN', 'FEB', 'MAR', 'APR', 'MAY'];
// let arr2;
// (function(){
// arr2 = arr1;
// arr1[0] = 'potato'
// })();
const arr1 = ['JAN', 'FEB', 'MAR', 'APR', 'MAY'];
let arr2;
(function(){
arr2 = [...arr1];
arr1[0] = 'potato'
})();
console.log(arr2);
// 83- USE DESTRUCTURING ASSIGNMENT TO ASSIGN VARIABLES FROM OBJECTS
var voxel = {x: 3.6, y: 7.4, z: 6.54};
const {x : q, y:w, z: e } = voxel;
// 84 - DESTRUCTURING ASSIGNMENT WITH NESTED OBJECTS
const LOCAL_FORECAST = {
today: {min: 72, max: 83},
tomorrow: {min: 73.3, max:84.6}
};
function getMaxOfTmrw(forecast){
"use strict";
// const maxOfTomorrow = undefined;
const { tomorrow: {max: maxOfTomorrow }} = forecast;
return maxOfTomorrow;
}
console.log("Destructuring Assignment with nested objects");
console.log(getMaxOfTmrw(LOCAL_FORECAST));
// 85 - USE DESTRUCTURING ASSIGNMENT TO ASSIGN VARIABLES FROM ARRAYS
const [z, x] = [1,2,3,4,5,6];
console.log(z,x);
let a2 = 8, b2 = 6;
(() => {
"use strict";
[a2, b2] = [b2, a2]
})();
console.log(a2);
console.log(b2);
// 86 - USE DESTRUCTURING ASSIGNMENT WITH THE REST OPERATOR
const source = [1,2,3,4,5,6,7,8,9];
function removeFirstTwo(list){
const [, , ...arr] = list;
return arr;
}
console.log("const [, , ...arr] = list;");
const arr = removeFirstTwo(source);
console.log(arr);
console.log(source);
// 86 - USE DESTRUCTURING ASSIGNMENT TO PASS AN OBJECT AS A FUNCTION's PARAMETERS
const stats = {
max: 56.78,
standard_deviation: 4.34,
median: 34.54,
mode: 23.87,
min: -0.75,
average: 35.85
};
const half = (function() {
// return function half(stats){
return function half({max, min}){
return (max + min) / 2.0;
};
})();
console.log(stats);
console.log(half(stats));
// 87 - CREATE STRINGS USING TEMPLATE LITERALS
const person = {
name: "Zodiac Hasbro",
age: 56
};
// template literal with multi-line and string interpolation with back ticks
// ${} javascript
const greeting = `Hello, my name is ${person.name}!
I am ${person.age} years old.`;
console.log(greeting);
// 88 - WRITE CONCISE OBJECT LITERAL DECLARATIONS USING SIMPLE FIELDS
// const createPerson = (name, age, gender) => {
// return {
// name: name,
// age: age,
// gender: gender
// };
// };
const createPerson = (name, age, gender) => ({name, age, gender});
console.log(createPerson("Zodiac Hasbro", 56, "Male"));
// 89 - WRITE CONCISE DECLARATIVE FUNCTIONS
// Long way
// const bicycle = {
// gear: 2,
// setGear: function(newGear){
// "use strict";
// this.gear = newGear;
// }
// };
const bicycle = {
gear: 2,
setGear(newGear){
"use strict";
this.gear = newGear;
}
};
bicycle.setGear(3);
console.log(bicycle.gear);
