js_methods.js

// Numbers

let myNumber = 123.1234;
console.log(myNumber);

console.log("toString: ", myNumber.toString());

console.log("toFixed: ", myNumber.toFixed(0));
console.log("toFixed: ", myNumber.toFixed(1));
console.log("toFixed: ", myNumber.toFixed(4));

console.log("valueOf myNumber: ", myNumber.valueOf());
console.log("valueOf 123: ", (123).valueOf());
console.log("valueOf 100 + 23", (100 + 23).valueOf());

const myString = "145"
const myString2 = "Juan"
const myString3 = " 1  2"
const myString4 = "   12"
const myBoolean = true


console.log(`${myString} to Number:`, Number(myString));
console.log(`${myString} to Float:`, parseFloat(myString));
console.log(`${myString} to Integer:`, parseInt(myString));


console.log(`${myString3} to Number:`, Number(myString3));
console.log(`${myString3} to Float:`, parseFloat(myString3));
console.log(`${myString3} to Integer:`, parseInt(myString3));

console.log(`${myString4} to Number:`, Number(myString4));
console.log(`${myString4} to Float:`, parseFloat(myString4));
console.log(`${myString4} to Integer:`, parseInt(myString4));

console.log(`${myBoolean} to Number:`, Number(myBoolean));
console.log(`${myBoolean} to Float:`, parseFloat(myBoolean));
console.log(`${myBoolean} to Integer:`, parseInt(myBoolean));

console.log("the largest number in js is: ", Number.MAX_VALUE);
console.log("the smallest number in js is: ", Number.MIN_VALUE);


// STRINGS

const myText = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const myText2 = "hola mundo, hola devs";
const myText3 = "hola mundo, _FIND-ME_ hola devs";

const match = new RegExp(/\_(.*?)\_/g)

console.log(myText);
console.log(myText2);
console.log(myText3);

console.log("myText length is:", myText.length);

console.log("F in myText is position:", myText.search("F"));
console.log("Ñ in myText is position:", myText.search("Ñ"));

console.log("F in myText is position:", myText.indexOf("F"));
console.log("Ñ in myText is position:", myText.indexOf("Ñ"));


console.log("hola in myText2 is position:", myText2.indexOf("hola"));

console.log("F in myText2 is position:", myText2.lastIndexOf("hola"));
console.log("Ñ in myText2 is position:", myText2.lastIndexOf("tres"));

console.log("myText2 substring 2, 4 is:", myText2.substring(2,4));
console.log("myText2 substring -10, -3 is:", myText2.substring(-10,-3));

console.log("myText2 slice 2, 4 is:", myText2.slice(2,4));
console.log("myText2 slice -10, -3 is:", myText2.slice(-10,-3));

console.log("myText2 substr 2, 4 is:", myText2.substr(2,4));
console.log("myText2 substr -10, -3 is:", myText2.substr(-8,3));

console.log(myText2.replace("devs", "people"));
console.log(myText2.toUpperCase());
console.log(myText.toLocaleLowerCase());


// Objects


const myObject = { foo: 'bar', baz: 42 };

console.log(myObject);

console.log("Entries", Object.entries(myObject));

console.log("keys",Object.keys(myObject));
console.log("values",Object.values(myObject));

myObject.bar = "foo";

console.log(myObject);

Object.freeze(myObject);

myObject.buz = "baz";

console.log(myObject);


// Arrays

const fruits = ["Banana", "Orange", "Apple", "Mango"];
const unsortedFruits = ["Banana", "Orange", "Rock",, "Apple", "Mango", "Rock"];

console.log(fruits.length);
console.log(fruits);
console.log(fruits.push("Grape"));
console.log(fruits);
console.log(fruits.pop());
console.log(fruits);
console.log(fruits.shift());
console.log(fruits);


const bigFruits = fruits.map((fruit) => {
  return "big ".concat(fruit);
})

console.log(bigFruits);

console.log(unsortedFruits);

const realFruits = unsortedFruits.filter((fruit) => {
  return fruit != "Rock"
});

console.log(realFruits);


const numbers = [ 1, 4, 6, 3 , 10]

const firstEven = numbers.find((number) => {
  
  return number % 2 === 0
});

console.log(firstEven);

const firstRock = unsortedFruits.indexOf("Rock")

console.log(firstRock);

const secondRock = unsortedFruits.indexOf("Rock", firstRock+1 )

console.log(secondRock);

let isDirty = unsortedFruits.some((fruit) => {
  return fruit === "Rock"
})

console.log("unsortedFruits is dirty ", isDirty);

isDirty = fruits.some((fruit) => {
  return fruit === "Rock"
})

console.log("fruits is dirty ", isDirty);

let isClean = unsortedFruits.every((fruit) => {
  return fruit != "Rock"
})

console.log("unsortedFruits is clean ", isClean);

isClean = fruits.every((fruit) => {
  return fruit != "Rock"
})

console.log("fruits is clean ", isClean)

const smoothie = fruits.reduce((prep, fruit)=> {
  return prep += `${fruit}-`;
},"")

console.log(smoothie);

const user = {
  name: "juan", 
  age: 30,
  hobbies: [
    "skate",
    "play videogames",
    "read"
  ]
}


const hobbiesString = user.hobbies.reduce((phrase, hobbie, index)=>{
  if (index+1 == user.hobbies.length) {
    return phrase += ` and ${hobbie}.`
  }
  return phrase += `${hobbie},`
}, `${user.name} likes to `)

console.log(hobbiesString);

document.body.append(hobbiesString)