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JavaScript基礎編 #1

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JavaScript基礎編 #1

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f348eed
JavaScript基礎編の答え追加
sym242 Oct 20, 2025
e47543e
応用問題の答え追加
sym242 Oct 20, 2025
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137 changes: 137 additions & 0 deletions app.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,137 @@
let nickname = '齋藤慎悟';
let age = '28';
let message = '私のニックネームは' + nickname + 'です。年齢は' + age + 'です。';
console.log(message);

let languages = ['JavaScript','PHP','Ruby','Python','Go'];
let JS = languages[0];
let Python = languages[3];
console.log(`私の好きな言語は${JS}です。次は${Python}を勉強してみたいです。`);

let user = {
name: 'John',
age: 26,
bloodType: 'A',
favorite: 'card',
};
console.log(user.age);


let playerList = [
{
name: 'John',
age: 26,
favorites: ['Card Game', 'Basket Ball', 'Programming'],
},
{
name: 'Bob',
age: 33,
favorites: ['Tinder', 'The Legend of Zelda'],
},
{
name: 'Michael',
age: 22,
favorites: ['Football', 'Smash Bros.'],
},
];
let bob = playerList.find(player => player.name === 'Bob');
let zelda = bob.favorites.find(item => item === 'The Legend of Zelda');
console.log(zelda);

let sum = 0;
for (let i = 0; i < playerList.length; i++) {
let player = playerList[i];
sum += player.age;
}
console.log(sum/playerList.length);

function sayHello() {
console.log("Hello");
}
sayHello();

let sayWorld = function() {
console.log("World");
};
sayWorld();

user.birthday = '2000-09-27';

user.sayHello = function() {
console.log('Hello！');
};

console.log(user.birthday);
user.sayHello();

let calc = {};
calc.add = function(x, y) {
console.log(x + y);
};
calc.add(4, 3);

calc.subtract = function(x, y) {
console.log(x - y);
};
calc.subtract(15, 5);

calc.multiply = function(x, y) {
console.log(x * y);
};
calc.multiply(7, 7);

calc.divide = function(x, y) {
console.log(x / y);
};
calc.divide(10, 2);

function remainder(x, y) {
return x % y;
}
let result = remainder(5, 3);
console.log('5 ÷ 3 の余りは ' + result + ' です。');


//変数xは関数foo内だけスコープが有効であり、関数fooの中でしか参照できません。
//関数fooの外で使おうとしても参照できず、x is not defined というエラーが出力されます。



let random = Math.floor(Math.random() * 9) + 1;
console.log('random => ', random);

setTimeout(function() {
console.log("Hello World!");
}, 3000);


let num = 3;
if (num > 0) {
console.log(num + " is greater than 0");
} else if (num < 0) {
console.log(num + " is less than 0");
} else {
console.log(num + " is 0");
}

let numbers = [];
for (let i = 0; i < 100; i++) {
numbers[i] = i;
}
console.log(numbers);

let mixed = [4, '2', 5, '8', '9', 0, 1];

for (let i = 0; i < mixed.length; i++) {
let num = mixed[i];

if (typeof num === 'number') {
if (num % 2 === 0) {
console.log('even');
} else {
console.log('odd');
}
} else {
console.log('number');
}
}
10 changes: 10 additions & 0 deletions index.html
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<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8" />
<title>JavaScriptの基礎問題</title>
</head>
<body>
<script src="./app.js"></script>
</body>
</html>