##プログラムを実行
console.log("Hello World!");
console.log(1+2);
console.log("1+2");
結果:
Hello World!
3
1+2
##文字列の連結
console.log("こんにちは"+"世界");
結果:
こんにちは世界
##変数の定義
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
##テンプレートリテラル
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
##条件分岐
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.