wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
$data[50] | if ($data.Count -gt 50) {{ $data[50] }} | Check bounds. | PowerShell |
x := 93 | x := 93 | Correct. | Go |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
const y; | const y = 27; | Initialize const. | JavaScript |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if [ $a = 91 ]; then | if [ "$a" = 91 ]; then | Quote variable. | Shell |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
json.sqrt(95) | import json
json.sqrt(95) | Import module first. | Python |
List(96,14,57) | List(96,14,57) | Correct. | Scala |
if foo = 74 | if foo == 74 | Use ==. | Ruby |
for (int i=0; i<44; i++) {{}} | for (int i=0; i<44; i++) {{}} | Correct. | Java |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
[45, 69, 36 | [45, 69, 36] | Close bracket. | Ruby |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (z) console.log('yes') else console.log('no') | if (z) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
x := 35 | x := 35 | Correct. | Go |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
INSERT INTO products VALUES ('result',16) | INSERT INTO products (id, role) VALUES ('result',16); | Specify columns. | SQL |
<entry name='world'/> | <entry name="world"/> | Double quotes. | XML |
for (temp in arr) | for (temp of arr) | for...in iterates keys. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
print 'info' | print('info') | print needs parentheses. | Python |
String a = 'value'; | String a = "value"; | Double quotes. | Java |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(17); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(17, () => console.log('listening')); | Add callback. | Node.js |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
val == '70' | val === 70 | Use strict equality. | JavaScript |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (foo = 63) {{}} | if (foo == 63) {{}} | Use ==. | Java |
disp('test') | disp('test') | Correct. | MATLAB |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
// comment | /* comment */ | Use /* */. | CSS |
println('data') | println("data") | Double quotes. | Scala |
{{"value":"message",}} | {{"value":"message"}} | Remove trailing comma. | JSON |
<p>output <b>world</p></b> | <p>output <b>world</b></p> | Nest properly. | HTML |
if (foo = 22) {} | if (foo == 22) {} | Use ==. | Dart |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let x: i32 = "world"; | let x: &str = "world"; | Type mismatch. | Rust |
#main {{ color: green; }} | #main {{ color: green; }} | Correct. | CSS |
echo result hello | echo 'result hello' | Quote to prevent splitting. | Shell |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
$arr[75] | if ($arr.Count -gt 75) {{ $arr[75] }} | Check bounds. | PowerShell |
Write-Host 'info' | Write-Host 'info' | Correct. | PowerShell |
def foo
puts 'result'
end | def foo
puts 'result'
end | Correct. | Ruby |
arr(89) | if length(arr) >= 89, arr(89), end | Check length. | MATLAB |
if x > 22
puts 'data' | if x > 22
puts 'data'
end | Add 'end'. | Ruby |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
class Item {{ int z; }}; | class Item {{ public: int z; }}; | Make public. | C++ |
<hr></hr> | <hr> | Self-closing. | HTML |
let list=vec![47,17,4]; let first=&list[0]; list.push(97); | let mut list=vec![47,17,4]; let first=list[0]; list.push(97); | Copy instead of reference. | Rust |
switch(count){{ case 35: break; }} | switch(count){{ case 35: break; default: break; }} | Add default case. | Java |
b > 22 & a < 3 | b > 22 and a < 3 | Use 'and' not '&'. | Python |
assert temp > 41 | assert temp > 41 | Correct. | Python |
values[82] | if (values.indices.contains(82)) values[82] | Check index. | Kotlin |
baz | baz() | Add parentheses. | Swift |
fn baz() -> i32 {{ 74 }} | fn baz() -> i32 {{ 74 }} | Correct. | Rust |
for b in range(70)
print(b) | for b in range(70):
print(b) | Colon after for. | Python |
if (val = 63) {{}} | if (val == 63) {{}} | Use ==. | Kotlin |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
name: info
age: 5 | name: info
age: 5 | Correct. | YAML |
var x int | var x int | Correct. | Go |
[26, 68, 68 | [26, 68, 68] | Close bracket. | Ruby |
var val int = 'hello' | var val string = 'hello' | Type mismatch. | Go |
num = 56 | num=56 | No spaces. | Shell |
if (bar = 31) | if (bar == 31) | Use ==. | Scala |
<person age=64> | <person age="64"> | Quote attribute. | XML |
function handle(temp)
print(temp)
end | function handle(temp)
print(temp)
end | Correct. | Lua |
if num = 37 | if num == 37 | Use ==. | MATLAB |
values[9] | if values.indices.contains(9) {{ values[9] }} | Check index. | Swift |
let data: number = 'world'; | let data: string = 'world'; | Fix type. | TypeScript |
render | render() | Add parentheses. | Kotlin |
WHERE id = '66' | WHERE id = 66 | Don't quote integer. | SQL |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
$temp = 16; if ($temp = 16) {{}} | $temp = 16; if ($temp == 16) {{}} | Use ==. | PHP |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if foo = 99 | if foo == 99 | Use ==. | Ruby |
my @arr = (5,36,10); | my @arr = (5,36,10); | Correct. | Perl |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
let z = 84; let z = 45; | let z = 84; z = 45; | Duplicate declaration. | JavaScript |
object Item {{ def main(args: Array[String]) = println("result") }} | object Item {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
if foo = 100 then
print('test')
end | if foo == 100 then
print('test')
end | Use ==. | Lua |
if [ $z = 34 ]; then | if [ "$z" = 34 ]; then | Quote variable. | Shell |
UPDATE items SET id='test' WHERE email=60 | UPDATE items SET id='test' WHERE email=60; | Add semicolon. | SQL |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
function foo(): void {{ return 18; }} | function foo(): number {{ return 18; }} | Return type mismatch. | TypeScript |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
int index = 'output'; | String index = 'output'; | Type mismatch. | Dart |
<table><tr><td>world<td>test</tr></table> | <table><tr><td>world</td><td>test</td></tr></table> | Close td. | HTML |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
local val = 10 | local val = 10 | Correct. | Lua |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
{{'age':'hello'}} | {{"age":"hello"}} | Use double quotes. | JSON |
{{"id":"hello" "status":73}} | {{"id":"hello", "status":73}} | Add comma. | JSON |
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