.at()

at()은 정수를 받고, 정수의 인덱스 값을 반환한다.

 

String.at()

const sentence = 'The quick brown fox jumps over the lazy dog.';

let index = 5;

console.log(`An index of ${index} returns the character ${sentence.at(index)}`);
// "An index of 5 returns the character u"

index = -4;

console.log(`An index of ${index} returns the character ${sentence.at(index)}`);
// "An index of -4 returns the character d"

Array.at()

const array1 = [5, 12, 8, 130, 44];

let index = 2;

console.log(`An index of ${index} returns ${array1.at(index)}`);
// "An index of 2 returns 8"

index = -2;

console.log(`An index of ${index} returns ${array1.at(index)}`);
// "An index of -2 returns 130"