Description
- Write a function that takes an array full of junk but containing one ‘needle’.
- junk로 가득하지만 ‘needle’ 하나를 포함하는 배열이 주어진다.
- After your function find the needle it should return a message that says: ‘found the needle at position (index)’
- ‘needle’의 인덱스와 함께 메시지를 반환한다.
Solution 01
function findNeedle(haystack) {
for (let i = 0; i < haystack.length; i++) {
if (haystack[i] === 'needle') {
return 'found the needle at position ' + i;
}
}
}
findNeedle([1, 2, 'needle', 4]); // found the needle at position 2
findNeedle([1, 'a piece of hay', true, 4, 'needle', undefined]); // found the needle at position 4
Solution 02
function findNeedle(haystack) {
return 'found the needle at position ' + haystack.indexOf('needle');
}
findNeedle([1, 2, 'needle', 4]); // found the needle at position 2
findNeedle([1, 'a piece of hay', true, 4, 'needle', undefined]); // found the needle at position 4
Solution 03
function findNeedle(haystack) {
return 'found the needle at position ${haystack.indexOf('needle')}';
}
findNeedle([1, 2, 'needle', 4]); // found the needle at position 2
findNeedle([1, 'a piece of hay', true, 4, 'needle', undefined]); // found the needle at position 4