반복문: for, while, do…while, for…of와 for…in 비교

소개

for 반복문 기초

// Classic for: great for indexes
const nums = [2, 4, 6];

for (let i = 0; i < nums.length; i++) {
  console.log("Index:", i, "Value:", nums[i]);
}

while 반복문 기초

// while: run while a condition stays true
let count = 3;

while (count > 0) {
  console.log("Countdown:", count);
  count = count - 1;
}

console.log("Go!");

do…while 기초

// do…while: runs the body at least once
let tries = 0;

do {
  console.log("Attempt:", tries + 1);
  tries = tries + 1;
} while (tries < 2);

for…of와 for…in 비교

// for…of: values of an iterable (arrays, strings, etc.)
// for…in: keys (property names)

const colors = ["red", "green", "blue"];

for (const value of colors) {
  console.log("of value:", value);
}

for (const key in colors) {
  console.log("in key:", key);
}

반복문 팁

for…of와 for…in 퀴즈

복습