【備忘録】Progate JavaScript 1,2 まとめ

console.log("Hello World!");
console.log(1+2);
console.log("1+2");

結果：
Hello World!
3
1+2

console.log("こんにちは"+"世界");

結果：
こんにちは世界

let name = "Tanaka";
console.log(name);
name = "Suzuki";
console.log(name);

結果：
Tanaka
Suzuki
//letによる変数宣言は後に更新可能
---------------------------------

const name = "Tanaka";
console.log(name);
name = "Suzuki";
console.log(name);

結果：
Tanaka
Tanaka
//constによる変数宣言は後に更新不可

const name = "Tanaka";
console.log(`My name is ${name}.`);

結果：
My name is Tanaka.

//`文字列${変数}`で「＋」と同等の役割

const number = 18
if (number > 10){
  console.log('Number is greater than 10.');
}

結果：
Number is greater than 10.
-------------------------------------

const number = 18
if (number > 20){
  console.log('Number is greater than 20.');
} else {
  console.log('Number is smaller than 20.');
}

結果:
Number is smaller than 20.