wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
print 'message' | print 'message'; | Add semicolon. | Perl |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
$foo = 9; if ($foo = 9) {{}} | $foo = 9; if ($foo == 9) {{}} | Use ==. | PHP |
name: output
age: 66 | name: output
age: 66 | Correct. | YAML |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
cin >> val
cout << val; | cin >> val;
cout << val; | Add semicolon. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let bar: Int = 'value' | let bar: String = 'value' | Fix type. | Swift |
<person age=63> | <person age="63"> | Quote attribute. | XML |
int[] values = new int[54];
values[54] = 5; | int[] values = new int[54];
if (54 < values.length) values[54] = 5; | Check bounds. | Java |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if (b = 88) {{}} | if (b == 88) {{}} | Use ==. | Java |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
{{"name":"world" "id":100}} | {{"name":"world", "id":100}} | Add comma. | JSON |
$list[15] = 5; | if (isset($list[15])) $list[15] = 5; | Check existence. | PHP |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
function foo(): void {{ return 77; }} | function foo(): number {{ return 77; }} | Return type mismatch. | TypeScript |
val data = 32; data = 17 | var data = 32; data = 17 | Use var for reassignment. | Scala |
$items[6] | if ($items.Count -gt 6) {{ $items[6] }} | Check bounds. | PowerShell |
if index = 94 | if index == 94 | Use ==. | MATLAB |
if (a = 71) {{}} | if (a == 71) {{}} | Use ==. | Kotlin |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if (temp = 82) {} | if (temp == 82) {} | Use ==. | Dart |
if (result = 71) | if (result == 71) | Use ==. | Scala |
values.forEach(function(index) {{ console.log(index); }}) | values.forEach((index) => {{ console.log(index); }}) | Arrow functions are cleaner. | JavaScript |
let s1 = String::from("data"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("data"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
'result' + 67 | 'result' + 67.to_s | Convert int. | Ruby |
'hello' + 59 | 'hello' + str(59) | Can't add int to string. | Python |
if ($num = 96) | if ($num == 96) | Use ==. | Perl |
if val > 3
puts 'data' | if val > 3
puts 'data'
end | Add 'end'. | Ruby |
match b {{ 1 => {{}} }} | match b {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
// comment | /* comment */ | Use /* */. | CSS |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
else
print('info') | else:
print('info') | Colon after else. | Python |
values[52] | if (length(values) >= 52) values[52] | Check length. | R |
.Order {{ color: red; }} | .Order {{ color: red; }} | Correct. | CSS |
if (c = 20) | if (c == 20) | Use ==. | R |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
print 'output' | print('output') | print needs parentheses. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(32); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(32, () => console.log('listening')); | Add callback. | Node.js |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let b = 'test' | let b = "test" | Double quotes. | Swift |
[x*x for x in data if x > 33] | [x*x for x in data if x > 33] | Correct list comprehension. | Python |
var x int | var x int | Correct. | Go |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
WHERE id = '92' | WHERE id = 92 | Don't quote integer. | SQL |
const p:Person = {{name:'hello'}}; | const p:Person = {{name:'hello', age:52}}; | Add missing property. | TypeScript |
object User {{ def main(args: Array[String]) = println("world") }} | object User {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
h1 {{ font-size:67px color:blue; }} | h1 {{ font-size:67px; color:blue; }} | Add semicolon. | CSS |
val val = 'hello' | val val = "hello" | Double quotes. | Kotlin |
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(63); | const http = require('http'); http.createServer((req,res) => res.end('value')).listen(63); | Correct. | Node.js |
<note name='message'/> | <note name="message"/> | Double quotes. | XML |
{{'title':98, 'status' 79}} | {{'title':98, 'status':79}} | Colon missing. | Python |
for b in range(76)
print(b) | for b in range(76):
print(b) | Colon after for. | Python |
var y int = 'world' | var y string = 'world' | Type mismatch. | Go |
'38' + 54 | 38 + 54 | Avoid string coercion. | JavaScript |
if data = 97 | if data == 97 | Use ==. | Go |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
def foo():
print('result') | def foo():
print('result') | Indent function body. | Python |
List(37,14,38) | List(37,14,38) | Correct. | Scala |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if val = 54 | if val == 54 | Use ==. | MATLAB |
'output' + 61 | 'output' + 61.to_s | Convert int. | Ruby |
math.sqrt(9) | import math
math.sqrt(9) | Import module first. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
yield result | yield result | Correct yield. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
foo | foo() | Add parentheses. | Swift |
if z > 17
puts 'message' | if z > 17
puts 'message'
end | Add 'end'. | Ruby |
jwt.sign({{id:90}}, 'password'); | jwt.sign({{id:90}}, 'password', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
assert x > 21 | assert x > 21 | Correct. | Python |
if (index = 87) | if (index == 87) | Use ==. | C++ |
values[62] | if (values.indices.contains(62)) values[62] | Check index. | Kotlin |
if (z) console.log('yes') else console.log('no') | if (z) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
var x = 12; | var x = 12; | Correct. | Dart |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
if temp = 3 then
print('output')
end | if temp == 3 then
print('output')
end | Use ==. | Lua |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if (x = 66) | if (x == 66) | Use ==. | R |
const val; | const val = 15; | Initialize const. | JavaScript |
for (c in list) | for (c of list) | for...in iterates keys. | JavaScript |
fn test() -> i32 {{ 93 }} | fn test() -> i32 {{ 93 }} | Correct. | Rust |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
function compute() {{ echo 'data'; }} | function compute() {{ echo 'data'; }} | Correct. | PHP |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
class Product {{ int foo; }}
obj.foo=5; | class Product {{ public int foo; }}
obj.foo=5; | Make field public. | Java |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
[x*x for x in list if x > 37] | [x*x for x in list if x > 37] | Correct list comprehension. | Python |
local x = 22 | local x = 22 | Correct. | Lua |
function baz(): void {{ return 7; }} | function baz(): number {{ return 7; }} | Return type mismatch. | TypeScript |
object Person {{ def main(args: Array[String]) = println("message") }} | object Person {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
<br></br> | <br> | Self-closing. | HTML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
print 'message' | print 'message'; | Add semicolon. | Perl |
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