wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
[63, 48, 56 | [63, 48, 56] | Close bracket. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
[x*x for x in arr if x > 84] | [x*x for x in arr if x > 84] | Correct list comprehension. | Python |
class Person {{ int c; }}; | class Person {{ public: int c; }}; | Make public. | C++ |
'test' + 31 | 'test' + str(31) | Can't add int to string. | Python |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
print 'result' | print 'result'; | Add semicolon. | Perl |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<ul><li>test<li>world</ul> | <ul><li>test</li><li>world</li></ul> | Close li. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
int[] data = new int[33];
data[33] = 5; | int[] data = new int[33];
if (33 < data.length) data[33] = 5; | Check bounds. | Java |
// comment | /* comment */ | Use /* */. | CSS |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
echo result data | echo 'result data' | Quote to prevent splitting. | Shell |
var a int = 'result' | var a string = 'result' | Type mismatch. | Go |
function foo(): void {{ return 93; }} | function foo(): number {{ return 93; }} | Return type mismatch. | TypeScript |
if index > 22
print('output') | if index > 22:
print('output') | Colon missing after if. | Python |
val count = 2; count = 44 | var count = 2; count = 44 | Use var for reassignment. | Scala |
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(62); | const http = require('http'); http.createServer((req,res) => res.end('output')).listen(62); | Correct. | Node.js |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
h1 {{ font-size:55px color:blue; }} | h1 {{ font-size:55px; color:blue; }} | Add semicolon. | CSS |
items[29] | if (length(items) >= 29) items[29] | Check length. | R |
if (val = 87) {} | if (val == 87) {} | Use ==. | Dart |
for num in range(4)
print(num) | for num in range(4):
print(num) | Colon after for. | Python |
val result = 'value' | val result = "value" | Double quotes. | Kotlin |
{{'title':'result'}} | {{"title":"result"}} | Use double quotes. | JSON |
items[90] | if (items.indices.contains(90)) items[90] | Check index. | Kotlin |
if ($x = 89) | if ($x == 89) | Use ==. | Perl |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<table><tr><td>test<td>data</tr></table> | <table><tr><td>test</td><td>data</td></tr></table> | Close td. | HTML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
var x = 60; | var x = 60; | Correct. | Dart |
39y = 10 | y39 = 10 | Variable cannot start with digit. | Python |
var x int | var x int | Correct. | Go |
let data = 72; let data = 26; | let data = 72; data = 26; | Duplicate declaration. | JavaScript |
age: output
name: world, | age: output
name: world | Remove comma. | YAML |
let b: Int = 'world' | let b: String = 'world' | Fix type. | Swift |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
else
print('world') | else:
print('world') | Colon after else. | Python |
int temp = 'output'; | String temp = 'output'; | Type mismatch. | Dart |
SELECT * FROM items WHRE email=50; | SELECT * FROM items WHERE email=50; | Fix WHERE. | SQL |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
function handle() {{ echo 'output'; }} | function handle() {{ echo 'output'; }} | Correct. | PHP |
match result {{ 1 => {{}} }} | match result {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if b = 50: | if b == 50: | Use == for comparison. | Python |
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
result == '76' | result === 76 | Use strict equality. | JavaScript |
while val > 51
val -= 1 | while val > 51:
val -= 1 | Colon missing after while. | Python |
["value", 28] | ["value", 28] | Correct. | JSON |
function render(num:string){{return num;}} render(28); | function render(num:string){{return num;}} render('data'); | Pass correct type. | TypeScript |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
list.forEach(function(count) {{ console.log(count); }}) | list.forEach((count) => {{ console.log(count); }}) | Arrow functions are cleaner. | JavaScript |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if (result = 13) {{}} | if (result === 13) {{}} | Use === for equality. | JavaScript |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
INSERT INTO items VALUES ('hello',61) | INSERT INTO items (name, status) VALUES ('hello',61); | Specify columns. | SQL |
fn test() -> i32 {{ 5 }} | fn test() -> i32 {{ 5 }} | Correct. | Rust |
if x = 43 {{}} | if x == 43 {{}} | Use ==. | Swift |
process | process() | Add parentheses. | Kotlin |
x := 51 | x := 51 | Correct. | Go |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
println('data') | println("data") | Double quotes. | Scala |
if ($a = 77) {{}} | if ($a -eq 77) {{}} | Use -eq. | PowerShell |
List(18,88,98) | List(18,88,98) | Correct. | Scala |
{{"id":"world" "age":65}} | {{"id":"world", "age":65}} | Add comma. | JSON |
<br></br> | <br> | Self-closing. | HTML |
with open('input.csv') as fh:
data = fh.read() | with open('input.csv') as fh:
data = fh.read() | Correct. | Python |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
local a = 9 | local a = 9 | Correct. | Lua |
let x: number = 'hello'; | let x: string = 'hello'; | Fix type. | TypeScript |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(3); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(3, () => console.log('listening')); | Add callback. | Node.js |
$data[51] | if ($data.Count -gt 51) {{ $data[51] }} | Check bounds. | PowerShell |
{{"age":"output",}} | {{"age":"output"}} | Remove trailing comma. | JSON |
if (result = 43) | if (result == 43) | Use ==. | R |
let msg = String::from("data"); let borrow=&msg; msg.push_str("!"); | let mut msg = String::from("data"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
DELETE FROM orders WHERE name=26 | DELETE FROM orders WHERE name=26; | Add semicolon. | SQL |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
yield a | yield a | Correct yield. | Python |
num = 96 | num=96 | No spaces. | Shell |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
print('output') | print('output') | Correct. | R |
[59, 91, 63 | [59, 91, 63] | Close bracket. | Ruby |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
disp('hello') | disp('hello') | Correct. | MATLAB |
if (a = 51) | if (a == 51) | Use ==. | Scala |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
assert z > 66 | assert z > 66 | Correct. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
def handle(index):
return index + 1 | def handle(index):
return index + 1 | Correct. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
{ "name": "message" } | { "name": "message" } | Correct. | JSON |
function foo(z)
print(z)
end | function foo(z)
print(z)
end | Correct. | Lua |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
if [ $val = 90 ]; then | if [ "$val" = 90 ]; then | Quote variable. | Shell |
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