id
int64 1
10k
| question
stringclasses 10
values | solution
stringclasses 10
values | difficulty
stringclasses 3
values | topic
stringclasses 5
values |
|---|---|---|---|---|
4,001 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | medium | arrays |
4,002 | Write a function that returns the factorial of a number. | function factorial(n) {
if (n === 0) return 1;
return n * factorial(n - 1);
} | medium | math |
4,003 | Write a function that reverses a string. | function reverseString(s) {
return s.split('').reverse().join('');
} | easy | strings |
4,004 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | medium | strings |
4,005 | Write a recursive function to sum an array. | function sumArrayRec(arr, index = 0) {
if (index >= arr.length) return 0;
return arr[index] + sumArrayRec(arr, index + 1);
} | medium | recursion |
4,006 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | easy | arrays |
4,007 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | medium | strings |
4,008 | Write a function that finds even numbers in an array. | function findEven(arr) {
return arr.filter(num => num % 2 === 0);
} | medium | loops |
4,009 | Write a function that returns the factorial of a number. | function factorial(n) {
if (n === 0) return 1;
return n * factorial(n - 1);
} | easy | math |
4,010 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | easy | arrays |
4,011 | Write a function that checks if a number is prime. | function isPrime(n) {
if (n <= 1) return false;
for (let i = 2; i * i <= n; i++) {
if (n % i === 0) return false;
}
return true;
} | easy | math |
4,012 | Write a function that finds even numbers in an array. | function findEven(arr) {
return arr.filter(num => num % 2 === 0);
} | medium | loops |
4,013 | Write a recursive function to compute Fibonacci numbers. | function fibonacci(n) {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
} | easy | recursion |
4,014 | Write a function that checks if a number is prime. | function isPrime(n) {
if (n <= 1) return false;
for (let i = 2; i * i <= n; i++) {
if (n % i === 0) return false;
}
return true;
} | easy | math |
4,015 | Write a function that checks if a number is prime. | function isPrime(n) {
if (n <= 1) return false;
for (let i = 2; i * i <= n; i++) {
if (n % i === 0) return false;
}
return true;
} | medium | math |
4,016 | Write a function that prints numbers from 1 to 100. | function printNumbers() {
for (let i = 1; i <= 100; i++) {
console.log(i);
}
} | easy | loops |
4,017 | Write a function that reverses a string. | function reverseString(s) {
return s.split('').reverse().join('');
} | hard | strings |
4,018 | Write a recursive function to sum an array. | function sumArrayRec(arr, index = 0) {
if (index >= arr.length) return 0;
return arr[index] + sumArrayRec(arr, index + 1);
} | easy | recursion |
4,019 | Write a recursive function to sum an array. | function sumArrayRec(arr, index = 0) {
if (index >= arr.length) return 0;
return arr[index] + sumArrayRec(arr, index + 1);
} | easy | recursion |
4,020 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | hard | strings |
4,021 | Write a function that returns the factorial of a number. | function factorial(n) {
if (n === 0) return 1;
return n * factorial(n - 1);
} | easy | math |
4,022 | Write a function that returns the sum of an array. | function sumArray(arr) {
return arr.reduce((a, b) => a + b, 0);
} | easy | arrays |
4,023 | Write a function that returns the factorial of a number. | function factorial(n) {
if (n === 0) return 1;
return n * factorial(n - 1);
} | medium | math |
4,024 | Write a function that prints numbers from 1 to 100. | function printNumbers() {
for (let i = 1; i <= 100; i++) {
console.log(i);
}
} | easy | loops |
4,025 | Write a function that finds even numbers in an array. | function findEven(arr) {
return arr.filter(num => num % 2 === 0);
} | easy | loops |
4,026 | Write a function that checks if a number is prime. | function isPrime(n) {
if (n <= 1) return false;
for (let i = 2; i * i <= n; i++) {
if (n % i === 0) return false;
}
return true;
} | easy | math |
4,027 | Write a recursive function to compute Fibonacci numbers. | function fibonacci(n) {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
} | easy | recursion |
4,028 | Write a function that returns the sum of an array. | function sumArray(arr) {
return arr.reduce((a, b) => a + b, 0);
} | easy | arrays |
4,029 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | hard | strings |
4,030 | Write a function that returns the sum of an array. | function sumArray(arr) {
return arr.reduce((a, b) => a + b, 0);
} | easy | arrays |
4,031 | Write a recursive function to compute Fibonacci numbers. | function fibonacci(n) {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
} | easy | recursion |
4,032 | Write a function that reverses a string. | function reverseString(s) {
return s.split('').reverse().join('');
} | easy | strings |
4,033 | Write a recursive function to sum an array. | function sumArrayRec(arr, index = 0) {
if (index >= arr.length) return 0;
return arr[index] + sumArrayRec(arr, index + 1);
} | easy | recursion |
4,034 | Write a function that checks if a number is prime. | function isPrime(n) {
if (n <= 1) return false;
for (let i = 2; i * i <= n; i++) {
if (n % i === 0) return false;
}
return true;
} | easy | math |
4,035 | Write a recursive function to compute Fibonacci numbers. | function fibonacci(n) {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
} | easy | recursion |
4,036 | Write a function that prints numbers from 1 to 100. | function printNumbers() {
for (let i = 1; i <= 100; i++) {
console.log(i);
}
} | easy | loops |
4,037 | Write a function that reverses a string. | function reverseString(s) {
return s.split('').reverse().join('');
} | easy | strings |
4,038 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | easy | arrays |
4,039 | Write a function that returns the sum of an array. | function sumArray(arr) {
return arr.reduce((a, b) => a + b, 0);
} | easy | arrays |
4,040 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | easy | arrays |
4,041 | Write a function that prints numbers from 1 to 100. | function printNumbers() {
for (let i = 1; i <= 100; i++) {
console.log(i);
}
} | easy | loops |
4,042 | Write a recursive function to compute Fibonacci numbers. | function fibonacci(n) {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
} | easy | recursion |
4,043 | Write a function that returns the sum of an array. | function sumArray(arr) {
return arr.reduce((a, b) => a + b, 0);
} | hard | arrays |
4,044 | Write a function that returns the factorial of a number. | function factorial(n) {
if (n === 0) return 1;
return n * factorial(n - 1);
} | easy | math |
4,045 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | easy | arrays |
4,046 | Write a function that reverses a string. | function reverseString(s) {
return s.split('').reverse().join('');
} | easy | strings |
4,047 | Write a function that checks if a number is prime. | function isPrime(n) {
if (n <= 1) return false;
for (let i = 2; i * i <= n; i++) {
if (n % i === 0) return false;
}
return true;
} | easy | math |
4,048 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | easy | arrays |
4,049 | Write a function that finds even numbers in an array. | function findEven(arr) {
return arr.filter(num => num % 2 === 0);
} | easy | loops |
4,050 | Write a function that finds even numbers in an array. | function findEven(arr) {
return arr.filter(num => num % 2 === 0);
} | medium | loops |
4,051 | Write a recursive function to sum an array. | function sumArrayRec(arr, index = 0) {
if (index >= arr.length) return 0;
return arr[index] + sumArrayRec(arr, index + 1);
} | medium | recursion |
4,052 | Write a recursive function to compute Fibonacci numbers. | function fibonacci(n) {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
} | medium | recursion |
4,053 | Write a function that checks if a number is prime. | function isPrime(n) {
if (n <= 1) return false;
for (let i = 2; i * i <= n; i++) {
if (n % i === 0) return false;
}
return true;
} | easy | math |
4,054 | Write a function that reverses a string. | function reverseString(s) {
return s.split('').reverse().join('');
} | easy | strings |
4,055 | Write a function that finds even numbers in an array. | function findEven(arr) {
return arr.filter(num => num % 2 === 0);
} | medium | loops |
4,056 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | hard | arrays |
4,057 | Write a function that finds even numbers in an array. | function findEven(arr) {
return arr.filter(num => num % 2 === 0);
} | hard | loops |
4,058 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | easy | arrays |
4,059 | Write a function that reverses a string. | function reverseString(s) {
return s.split('').reverse().join('');
} | medium | strings |
4,060 | Write a function that finds even numbers in an array. | function findEven(arr) {
return arr.filter(num => num % 2 === 0);
} | easy | loops |
4,061 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | easy | arrays |
4,062 | Write a function that reverses a string. | function reverseString(s) {
return s.split('').reverse().join('');
} | hard | strings |
4,063 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | hard | arrays |
4,064 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | easy | strings |
4,065 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | easy | strings |
4,066 | Write a function that returns the sum of an array. | function sumArray(arr) {
return arr.reduce((a, b) => a + b, 0);
} | medium | arrays |
4,067 | Write a function that reverses a string. | function reverseString(s) {
return s.split('').reverse().join('');
} | easy | strings |
4,068 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | hard | strings |
4,069 | Write a function that finds even numbers in an array. | function findEven(arr) {
return arr.filter(num => num % 2 === 0);
} | easy | loops |
4,070 | Write a function that prints numbers from 1 to 100. | function printNumbers() {
for (let i = 1; i <= 100; i++) {
console.log(i);
}
} | easy | loops |
4,071 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | easy | arrays |
4,072 | Write a function that returns the factorial of a number. | function factorial(n) {
if (n === 0) return 1;
return n * factorial(n - 1);
} | easy | math |
4,073 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | hard | strings |
4,074 | Write a function that reverses a string. | function reverseString(s) {
return s.split('').reverse().join('');
} | easy | strings |
4,075 | Write a recursive function to sum an array. | function sumArrayRec(arr, index = 0) {
if (index >= arr.length) return 0;
return arr[index] + sumArrayRec(arr, index + 1);
} | easy | recursion |
4,076 | Write a function that checks if a number is prime. | function isPrime(n) {
if (n <= 1) return false;
for (let i = 2; i * i <= n; i++) {
if (n % i === 0) return false;
}
return true;
} | easy | math |
4,077 | Write a function that returns the sum of an array. | function sumArray(arr) {
return arr.reduce((a, b) => a + b, 0);
} | medium | arrays |
4,078 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | easy | strings |
4,079 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | hard | strings |
4,080 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | medium | arrays |
4,081 | Write a recursive function to compute Fibonacci numbers. | function fibonacci(n) {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
} | medium | recursion |
4,082 | Write a recursive function to sum an array. | function sumArrayRec(arr, index = 0) {
if (index >= arr.length) return 0;
return arr[index] + sumArrayRec(arr, index + 1);
} | easy | recursion |
4,083 | Write a function that prints numbers from 1 to 100. | function printNumbers() {
for (let i = 1; i <= 100; i++) {
console.log(i);
}
} | medium | loops |
4,084 | Write a function that returns the factorial of a number. | function factorial(n) {
if (n === 0) return 1;
return n * factorial(n - 1);
} | easy | math |
4,085 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | medium | strings |
4,086 | Write a function that returns the sum of an array. | function sumArray(arr) {
return arr.reduce((a, b) => a + b, 0);
} | easy | arrays |
4,087 | Write a function that returns the sum of an array. | function sumArray(arr) {
return arr.reduce((a, b) => a + b, 0);
} | hard | arrays |
4,088 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | easy | arrays |
4,089 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | easy | arrays |
4,090 | Write a recursive function to compute Fibonacci numbers. | function fibonacci(n) {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
} | medium | recursion |
4,091 | Write a function that reverses a string. | function reverseString(s) {
return s.split('').reverse().join('');
} | easy | strings |
4,092 | Write a function that reverses a string. | function reverseString(s) {
return s.split('').reverse().join('');
} | hard | strings |
4,093 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | medium | strings |
4,094 | Write a function that finds even numbers in an array. | function findEven(arr) {
return arr.filter(num => num % 2 === 0);
} | easy | loops |
4,095 | Write a function that prints numbers from 1 to 100. | function printNumbers() {
for (let i = 1; i <= 100; i++) {
console.log(i);
}
} | medium | loops |
4,096 | Write a function that returns the factorial of a number. | function factorial(n) {
if (n === 0) return 1;
return n * factorial(n - 1);
} | hard | math |
4,097 | Write a function that checks if a number is prime. | function isPrime(n) {
if (n <= 1) return false;
for (let i = 2; i * i <= n; i++) {
if (n % i === 0) return false;
}
return true;
} | easy | math |
4,098 | Write a function that checks if a string is a palindrome. | function isPalindrome(s) {
return s === s.split('').reverse().join('');
} | easy | strings |
4,099 | Write a function that checks if a number is prime. | function isPrime(n) {
if (n <= 1) return false;
for (let i = 2; i * i <= n; i++) {
if (n % i === 0) return false;
}
return true;
} | hard | math |
4,100 | Write a function that removes duplicates from an array. | function removeDuplicates(arr) {
return [...new Set(arr)];
} | medium | arrays |
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