JavaScript 공통 문자열 메소드

const text = "hello world"
console.log(`text at the index 4 is ${text.charAt(4)}`);

const vowels = "aeiou"
const consonents = "bcdfghjklmnpqrstvwxyz";
const word0 = "Hello world.
const word1 = " Hi world.";
const word2 = " Bye world.";
const alphabets = vowels.concat(consonents);
const sentence = word0.concat(word1, word2);
console.log(alphabets);
console.log(sentence);

const vowels = "aeiou

console.log(vowels.includes("u"));// true

console.log(vowels.includes("z"));// false

const consonents = "bcdfghjklmnpqrstvwxyz"

console.log(consonents.includes("h"))// true

console.log(consonents.includes("a"))// false"

const text = "hello world"

console.log(text.endsWith("d")); // true

console.log(text.endsWith("world")); // true

console.log(text.endsWith("l"));// false;

const alphabets = "abcdefghijklmnpqrstuvwxyza"

console.log(alphabets.indexOf("i")); // output: 8

console.log(alphabets.indexOf("a", 1)); // output: 25

console.log(alphabets.indexOf("o")); // output: -1

const alphabets = "abcdefghijklmnpqrstuvwxyza"

console.log(alphabets.lastIndexOf("i")); // output: 8

console.log(alphabets.lastIndexOf("a")); // output: 25

console.log(alphabets.lastIndexOf("o")); // output: -1;

const text = "The quick brown Bear jumps over the lazy dog."

const regex = /Bear/;

console.log(text.replace("Bear", "goat"));

console.log(text.replace(regex, "lion"));;

const text = "The quick brown fox jumps over the lazy dog."

console.log(text.slice(10)); // output: brown fox jumps over the lazy dog.

console.log(text.slice(10, 20)); // output: brown fox

// if you use negative index then it will count from the end of string

console.log(text.slice(-9, -1)); // output: lazy dog

const text = "The quick brown fox jumps over the lazy dog."

const words = "ab, eb, ib, ob, ub";

console.log(text.split(" "));
console.log(words.split("b"));

const text = "The quick brown fox jumps over the lazy dog."

console.log(text.startsWith("T")); // output: true

console.log(text.startsWith("The")); // output: true

console.log(text.startsWith("A")); // output: false

console.log(text.startsWith("quick")); // output: false;

const text = "The quick brown fox jumps over the lazy dog."

console.log(text.substring(10)); // output: brown fox jumps over the lazy dog.

console.log(text.substring(4, 15)); // output: quick brown

// if you give greater value on the first parameter then it will automatically swap the parameters

console.log(text.substring(15, 4)); // output: quick brown;

const text = "The Quick Brown Fox Jumps Over The Lazy Dog."

console.log(text.toLowerCase());

const text = "The quick brown fox jumps over the lazy dog."

console.log(text.toUpperCase());

const text = "      Hello world     "

console.log(text.trim()); // output: Hello world;

const text = "      Hello world     "
console.log(text.trimStart());;

const text = "      Hello world     "
console.log(text.trimEnd());