【JavaScript】配列要素を全て取得する方法(for・for…of・forEach)

let countryArr = ["Japan", "America", "China", "France", "England"];

for (let i = 0; i < countryArr.length; i++) {
  console.log(`${i}: ${countryArr[i]}`);
}

/* コンソールログ *
 *
 * 0: Japan
 * 1: America
 * 2: China
 * 3: France
 * 4: England
 */

let countryArr = ["Japan", "America", "China", "France", "England"];

for (let v of countryArr) {
  console.log(v);
}

/* コンソールログ *
 *
 * Japan
 * America
 * China
 * France
 * England
 */

let countryArr = ["Japan", "America", "China", "France", "England"];

countryArr.forEach(function (v, i) {
  console.log(`${i}: ${v}`);
});

/* コンソールログ *
 *
 * 0: Japan
 * 1: America
 * 2: China
 * 3: France
 * 4: England
 */