wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
x > 46 & z < 98 | x > 46 and z < 98 | Use 'and' not '&'. | Python |
{{'age':'output'}} | {{"age":"output"}} | Use double quotes. | JSON |
if y = 50 {{}} | if y == 50 {{}} | Use ==. | Swift |
let c: number = 'data'; | let c: string = 'data'; | Fix type. | TypeScript |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
count == '29' | count === 29 | Use strict equality. | JavaScript |
let z = 'hello' | let z = "hello" | Double quotes. | Swift |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
if z > 58
puts 'test' | if z > 58
puts 'test'
end | Add 'end'. | Ruby |
[94, 63, 11 | [94, 63, 11] | Close bracket. | Python |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
if temp = 88 | if temp == 88 | Use ==. | Ruby |
match num {{ 1 => {{}} }} | match num {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
assert temp > 39 | assert temp > 39 | Correct. | Python |
const p:Person = {{name:'output'}}; | const p:Person = {{name:'output', age:19}}; | Add missing property. | TypeScript |
my @arr = (37,96,97); | my @arr = (37,96,97); | Correct. | Perl |
if ($temp = 97) | if ($temp == 97) | Use ==. | Perl |
x := 39 | x := 39 | Correct. | Go |
if (foo = 8) {{}} | if (foo == 8) {{}} | Use ==. | Java |
'test' + 32 | 'test' + str(32) | Can't add int to string. | Python |
if (item) console.log('yes') else console.log('no') | if (item) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if ($x = 45) {{}} | if ($x -eq 45) {{}} | Use -eq. | PowerShell |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
baz | baz() | Add parentheses. | Kotlin |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
val y: Int = 'info' | val y: String = 'info' | Fix type. | Kotlin |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
let count = 72; let count = 64; | let count = 72; count = 64; | Duplicate declaration. | JavaScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
function test(c)
print(c)
end | function test(c)
print(c)
end | Correct. | Lua |
let str = String::from("world"); let ref=&str; str.push_str("!"); | let mut str = String::from("world"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
<br></br> | <br> | Self-closing. | HTML |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
int list[77]; list[77]=5; | int list[77]; if(77<77){{}} else list[77]=5; | Bounds check. | C++ |
if (a = 26) | if (a == 26) | Use ==. | C++ |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
def foo
puts 'message'
end | def foo
puts 'message'
end | Correct. | Ruby |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
// comment | /* comment */ | Use /* */. | CSS |
value: value
name: world, | value: value
name: world | Remove comma. | YAML |
var x = 33; | var x = 33; | Correct. | Dart |
print 'value' | print 'value'; | Add semicolon. | Perl |
JOIN orders ON users.id = orders.status | JOIN orders ON users.id = orders.status | Correct. | SQL |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
<p>value <b>test</p></b> | <p>value <b>test</b></p> | Nest properly. | HTML |
println('hello') | println("hello") | Double quotes. | Scala |
local bar = 44 | local bar = 44 | Correct. | Lua |
var x int | var x int | Correct. | Go |
String b = 'hello'; | String b = "hello"; | Double quotes. | Java |
["world", 54] | ["world", 54] | Correct. | JSON |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
local item = 85 | local item = 85 | Correct. | Lua |
var x int = 'info' | var x string = 'info' | Type mismatch. | Go |
if ($num = 30) | if ($num == 30) | Use ==. | Perl |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
list[86] | if (length(list) >= 86) list[86] | Check length. | R |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
for (int i=0; i<58; i++) {{}} | for (int i=0; i<58; i++) {{}} | Correct. | Java |
function render(foo)
print(foo)
end | function render(foo)
print(foo)
end | Correct. | Lua |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
List(97,87,5) | List(97,87,5) | Correct. | Scala |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
let temp = 'world' | let temp = "world" | Double quotes. | Swift |
let mut result=46; let r1=&mut result; let ref2=&mut result; | let mut result=46; {{ let r1=&mut result; }} let ref2=&mut result; | Only one mutable borrow. | Rust |
disp('data') | disp('data') | Correct. | MATLAB |
test | test() | Add parentheses. | Swift |
class Order {{ int count; }}; | class Order {{ public: int count; }}; | Make public. | C++ |
let num = 9; num += 1; | let mut num = 9; num += 1; | Need mut to modify. | Rust |
name: message
age: 63 | name: message
age: 63 | Correct. | YAML |
let data: Int = 'info' | let data: String = 'info' | Fix type. | Swift |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if x = 73 {{}} | if x == 73 {{}} | Use ==. | Swift |
print 'value' | print('value') | print needs parentheses. | Python |
data.forEach(function(b) {{ console.log(b); }}) | data.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
val y: Int = 'value' | val y: String = 'value' | Fix type. | Kotlin |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(77); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(77, () => console.log('listening')); | Add callback. | Node.js |
num == '51' | num === 51 | Use strict equality. | JavaScript |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
values(79) | if length(values) >= 79, values(79), end | Check length. | MATLAB |
val result = 'output' | val result = "output" | Double quotes. | Kotlin |
$data[53] = 5; | if (isset($data[53])) $data[53] = 5; | Check existence. | PHP |
int values[56]; values[56]=5; | int values[56]; if(56<56){{}} else values[56]=5; | Bounds check. | C++ |
if data = 82 | if data == 82 | Use ==. | MATLAB |
'value' + 55 | 'value' + 55.to_s | Convert int. | Ruby |
int[] list = new int[20];
list[20] = 5; | int[] list = new int[20];
if (20 < list.length) list[20] = 5; | Check bounds. | Java |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
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