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Serein Basic-Loop-Quiz #2

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zxcvbnm0091 Dec 30, 2025
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zxcvbnm0091 Jan 3, 2026
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zxcvbnm0091 Jan 3, 2026
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51 changes: 38 additions & 13 deletions Loop-Array/countingSheep.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,18 +4,43 @@

function countSheeps(sheep) {
// TODO
let sum = 0;
for (let i = 0; i < sheep.length; i++) {
if (sheep[i]) sum += 1;
}
return sum;
}

console.log(countSheeps([])) //0
console.log(countSheeps([undefined])) //0
console.log(countSheeps([null])) //0
console.log(countSheeps([false])) //0
console.log(countSheeps([true])) //1
console.log(countSheeps(
[true,true,true,false,
true,true,true,true,
true,false,true,false,
true,false,false,true,
true,true,true,true,
false,false,true,true
])) //17
console.log(countSheeps([])); //0
console.log(countSheeps([undefined])); //0
console.log(countSheeps([null])); //0
console.log(countSheeps([false])); //0
console.log(countSheeps([true])); //1
console.log(
countSheeps([
true,
true,
true,
false,
true,
true,
true,
true,
true,
false,
true,
false,
true,
false,
false,
true,
true,
true,
true,
true,
false,
false,
true,
true,
])
); //17
17 changes: 11 additions & 6 deletions Loop-Array/findHighest.js
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Expand Up @@ -4,11 +4,16 @@

function findHighestInt(arr) {
//your code here

let highest = 0;
for (let i = 0; i < arr.length; i++) {
highest = arr[i] > highest ? arr[i] : highest;
}

return highest;
}

console.log(findHighestInt([78,56,232,12,8])); //8
console.log(findHighestInt([78,56,232,12,18])); //12
console.log(findHighestInt([78,56,232,412,228])); //56
console.log(findHighestInt([78,56,232,12,0])); //0
console.log(findHighestInt([1,56,232,12,8])); //1
console.log(findHighestInt([78, 56, 232, 12, 8])); //232
console.log(findHighestInt([78, 56, 232, 12, 18])); //232
console.log(findHighestInt([78, 56, 232, 412, 228])); //412
console.log(findHighestInt([78, 56, 232, 12, 0])); //232
console.log(findHighestInt([1, 56, 232, 12, 8])); //232
86 changes: 81 additions & 5 deletions Loop-Array/findNeedle.js
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Expand Up @@ -4,14 +4,90 @@

function findNeedle(haystack) {
// your code here
for (let i = 0; i < haystack.length; i++) {
if (haystack[i] === "needle") return `found the needle at position ${i}`;
}
return "Needle not found";
}

let haystack_1 = ['3', '123124234', undefined, 'needle', 'world', 'hay', 2, '3', true, false];
let haystack_2 = ['283497238987234', 'a dog', 'a cat', 'some random junk', 'a piece of hay', 'needle', 'something somebody lost a while ago'];
let haystack_3 = [1,2,3,4,5,6,7,8,8,7,5,4,3,4,5,6,67,5,5,3,3,4,2,34,234,23,4,234,324,324,'needle',1,2,3,4,5,5,6,5,4,32,3,45,54];
let haystack_4 = ["hay", "junk", "hay", "hay", "moreJunk", "needle", "randomJunk"];
let haystack_1 = [
"3",
"123124234",
undefined,
"needle",
"world",
"hay",
2,
"3",
true,
false,
];
let haystack_2 = [
"283497238987234",
"a dog",
"a cat",
"some random junk",
"a piece of hay",
"needle",
"something somebody lost a while ago",
];
let haystack_3 = [
1,
2,
3,
4,
5,
6,
7,
8,
8,
7,
5,
4,
3,
4,
5,
6,
67,
5,
5,
3,
3,
4,
2,
34,
234,
23,
4,
234,
324,
324,
"needle",
1,
2,
3,
4,
5,
5,
6,
5,
4,
32,
3,
45,
54,
];
let haystack_4 = [
"hay",
"junk",
"hay",
"hay",
"moreJunk",
"needle",
"randomJunk",
];

console.log(findNeedle(haystack_1)); //found the needle at position 3
console.log(findNeedle(haystack_2)); //found the needle at position 5
console.log(findNeedle(haystack_3)); //found the needle at position 30
console.log(findNeedle(haystack_4)); //found the needle at position 5
console.log(findNeedle(haystack_4)); //found the needle at position 5
16 changes: 10 additions & 6 deletions Loop-Array/findSmallest.js
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Expand Up @@ -4,11 +4,15 @@

function findSmallestInt(arr) {
//your code here

let smallest = Infinity;
for (let i = 0; i < arr.length; i++) {
smallest = arr[i] < smallest ? arr[i] : smallest;
}
return smallest;
}

console.log(findSmallestInt([78,56,232,12,8])); //8
console.log(findSmallestInt([78,56,232,12,18])); //12
console.log(findSmallestInt([78,56,232,412,228])); //56
console.log(findSmallestInt([78,56,232,12,0])); //0
console.log(findSmallestInt([1,56,232,12,8])); //1
console.log(findSmallestInt([78, 56, 232, 12, 8])); //8
console.log(findSmallestInt([78, 56, 232, 12, 18])); //12
console.log(findSmallestInt([78, 56, 232, 412, 228])); //56
console.log(findSmallestInt([78, 56, 232, 12, 0])); //0
console.log(findSmallestInt([1, 56, 232, 12, 8])); //1
13 changes: 9 additions & 4 deletions Loop-Array/positifSum.js
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Expand Up @@ -4,9 +4,14 @@

function positiveSum(arr) {
//code here
let sum = 0;
for (let i = 0; i < arr.length; i++) {
sum += arr[i] > 0 ? arr[i] : 0;
}
return sum;
}

console.log(positiveSum([1,2,3,4,5])) //15
console.log(positiveSum([1,-2,3,4,5])) //13
console.log(positiveSum([])) //13
console.log(positiveSum([-1,2,3,4,-5])) //9
console.log(positiveSum([1, 2, 3, 4, 5])); //15
console.log(positiveSum([1, -2, 3, 4, 5])); //13
console.log(positiveSum([])); //13
console.log(positiveSum([-1, 2, 3, 4, -5])); //9
11 changes: 8 additions & 3 deletions Loop-Array/squareSum.js
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Expand Up @@ -2,10 +2,15 @@
//tambahkan dengan pangkat 2 (n**2)
//source: https://www.codewars.com/kata/515e271a311df0350d00000f

function squareSum(numbers){
function squareSum(numbers) {
//code here
let sum = 0;
for (let i = 0; i < numbers.length; i++) {
sum += numbers[i] ** 2;
}
return sum;
}

console.log(squareSum([1,2])); //5
console.log(squareSum([1, 2])); //5
console.log(squareSum([0, 3, 4, 5])); //50
console.log(squareSum([])); //0
console.log(squareSum([])); //0
12 changes: 9 additions & 3 deletions Loop-Number/centuryYear.js
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Expand Up @@ -5,12 +5,18 @@
//source: https://www.codewars.com/kata/5a3fe3dde1ce0e8ed6000097

function century(year) {
// Finish this :)
return;
// const str = String(parseInt(year / 100));

let result = 0;
while (year >= 1) {
result += 1;
year -= 100;
}
return result;
}

console.log(century(1705)); //18
console.log(century(1900)); //19
console.log(century(1601)); //17
console.log(century(2000)); //20
console.log(century(89)); //1
console.log(century(89)); //1
9 changes: 7 additions & 2 deletions Loop-Number/summation.js
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Expand Up @@ -3,10 +3,15 @@
//8 -> 36 (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8)
//source: https://www.codewars.com/kata/55d24f55d7dd296eb9000030

function summation (num) {
function summation(num) {
// Code here
let sum = 0;
for (let i = 1; i <= num; i++) {
sum += i;
}
return sum;
}

console.log(summation(1)); //1
console.log(summation(2)); //3
console.log(summation(8)); //36
console.log(summation(8)); //36
13 changes: 10 additions & 3 deletions Loop-String/abbrevName.js
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Expand Up @@ -3,12 +3,19 @@
// patrick feeney => P.F
//source: https://www.codewars.com/kata/57eadb7ecd143f4c9c0000a3

function abbrevName(name){
//code here
function abbrevName(name) {
let result = "";
for (let i = 0; i < name.length; i++) {
if (name[i] === " ") result += ".";
if (i === 0 || name[i - 1] === " ") {
result += name[i];
}
}
return result;
}

console.log(abbrevName("Sam Harris")); //S.H
console.log(abbrevName("Patrick Feenan")); //P.F
console.log(abbrevName("Evan Cole")); //E.C
console.log(abbrevName("P Favuzzi")); //P.F
console.log(abbrevName("David Mendieta")); //D.M
console.log(abbrevName("David Mendieta")); //D.M
12 changes: 8 additions & 4 deletions Loop-String/noSpace.js
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Expand Up @@ -2,10 +2,14 @@
//hilangkan spasinya saja
//source: https://www.codewars.com/kata/57eae20f5500ad98e50002c5

function noSpace(x){
function noSpace(x) {
//code here

let result = "";
for (let i = 0; i < x.length; i++) {
if (x[i] !== " ") result += x[i];
}
return result;
}

console.log(noSpace("8 j 8 mBliB8g imjB8B8 jl B")) //8j8mBliB8gimjB8B8jlB
console.log(noSpace("8 8 Bi fk8h B 8 BB8B B B B888 c hl8 BhB fd")) //88Bifk8hB8BB8BBBB888chl8BhBfd
console.log(noSpace("8 j 8 mBliB8g imjB8B8 jl B")); //8j8mBliB8gimjB8B8jlB
console.log(noSpace("8 8 Bi fk8h B 8 BB8B B B B888 c hl8 BhB fd")); //88Bifk8hB8BB8BBBB888chl8BhBfd
22 changes: 13 additions & 9 deletions Loop-String/removeChar.js
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Expand Up @@ -2,13 +2,17 @@
//hapus huruf pertama dan terakhir
//source: https://www.codewars.com/kata/56bc28ad5bdaeb48760009b0

function removeChar(str){

};
function removeChar(str) {
let result = "";
for (let i = 0; i < str.length; i++) {
if (i > 0 && i < str.length - 1) result += str[i];
}
return result;
}

console.log(removeChar('eloquent')); //loquen
console.log(removeChar('country')); //ountr
console.log(removeChar('person')); //ountr
console.log(removeChar('place')); //lac
console.log(removeChar('ab')) //
console.log(removeChar('ooopsss')); //oopss
console.log(removeChar("eloquent")); //loquen
console.log(removeChar("country")); //ountr
console.log(removeChar("person")); //ountr
console.log(removeChar("place")); //lac
console.log(removeChar("ab")); //
console.log(removeChar("ooopsss")); //oopss
11 changes: 8 additions & 3 deletions Loop-String/stringRepeat.js
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Expand Up @@ -2,15 +2,20 @@
//hanya mengulang string sebanyak n kali
//source: https://www.codewars.com/kata/57a0e5c372292dd76d000d7e

function repeatStr (n, s) {
function repeatStr(n, s) {
//code here
let result = n > 0 ? s : "";
for (let i = 1; i < n; i++) {
result += s;
}
return result;
}

console.log(repeatStr(3, "*")); //***
console.log(repeatStr(5, "#")); //#####
console.log(repeatStr(2, "ha ")); //ha ha
console.log(repeatStr(2, "ha ")); //ha ha
console.log(repeatStr(0, "")); //
console.log(repeatStr(0, "I")); //
console.log(repeatStr(5, "")); //
console.log(repeatStr(6, "I")); //IIIIII
console.log(repeatStr(5, "Hello")); //HelloHelloHelloHelloHello
console.log(repeatStr(5, "Hello")); //HelloHelloHelloHelloHello
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