wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
with open('input.csv') as file_handle:
data = file_handle.read() | with open('input.csv') as file_handle:
data = file_handle.read() | Correct. | Python |
else
print('value') | else:
print('value') | Colon after else. | Python |
{{"value":"value" "title":49}} | {{"value":"value", "title":49}} | Add comma. | JSON |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
jwt.sign({{id:76}}, 'password'); | jwt.sign({{id:76}}, 'password', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
function render() {{
return
{{key:'info'}}
}} | function render() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
<br></br> | <br> | Self-closing. | HTML |
$foo = 5; if ($foo = 5) {{}} | $foo = 5; if ($foo == 5) {{}} | Use ==. | PHP |
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(84); | const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(84); | Correct. | Node.js |
.Product {{ color: blue; }} | .Product {{ color: blue; }} | Correct. | CSS |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
items[44] | if items.indices.contains(44) {{ items[44] }} | Check index. | Swift |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
if (b = 16) {{}} | if (b == 16) {{}} | Use ==. | Kotlin |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
my @arr = (51,31,61); | my @arr = (51,31,61); | Correct. | Perl |
if x > 27
print('hello') | if x > 27:
print('hello') | Colon missing after if. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
echo value world | echo 'value world' | Quote to prevent splitting. | Shell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
SELECT name status FROM users; | SELECT name, status FROM users; | Add comma. | SQL |
let y = 90; let y = 60; | let y = 90; y = 60; | Duplicate declaration. | JavaScript |
{{'id':68, 'status' 11}} | {{'id':68, 'status':11}} | Colon missing. | Python |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
if (x = 89) {} | if (x == 89) {} | Use ==. | Dart |
while z > 90
z -= 1 | while z > 90:
z -= 1 | Colon missing after while. | Python |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
cin >> c; | int c;
cin >> c; | Declare variable. | C++ |
DELETE FROM users WHERE status=61 | DELETE FROM users WHERE status=61; | Add semicolon. | SQL |
if [ $index = 1 ]; then | if [ "$index" = 1 ]; then | Quote variable. | Shell |
val index = 'data' | val index = "data" | Double quotes. | Kotlin |
// comment | /* comment */ | Use /* */. | CSS |
["test", 88] | ["test", 88] | Correct. | JSON |
String name = 'value'; | String name = 'value'; | Correct. | Dart |
const obj:Person = {{name:'hello'}}; | const obj:Person = {{name:'hello', age:76}}; | Add missing property. | TypeScript |
<person name='value'/> | <person name="value"/> | Double quotes. | XML |
{{'name':'test'}} | {{"name":"test"}} | Use double quotes. | JSON |
<div><p>test</div></p> | <div><p>test</p></div> | Nest properly. | HTML |
let temp: number = 'hello'; | let temp: string = 'hello'; | Fix type. | TypeScript |
if y > 57
puts 'value' | if y > 57
puts 'value'
end | Add 'end'. | Ruby |
if num = 16 | if num == 16 | Use ==. | Go |
List(58,17,28) | List(58,17,28) | Correct. | Scala |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
let item = 11; | let item = 11; | Correct. | JavaScript |
fn foo() -> i32 {{ 82 }} | fn foo() -> i32 {{ 82 }} | Correct. | Rust |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
a == '90' | a === 90 | Use strict equality. | JavaScript |
JOIN orders ON users.id = orders.email | JOIN orders ON users.id = orders.email | Correct. | SQL |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
if (val) console.log('yes') else console.log('no') | if (val) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
function baz(index)
print(index)
end | function baz(index)
print(index)
end | Correct. | Lua |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
val z = 93; z = 58 | var z = 93; z = 58 | Use var for reassignment. | Scala |
function process() {{ echo 'info'; }} | function process() {{ echo 'info'; }} | Correct. | PHP |
assert x > 97 | assert x > 97 | Correct. | Python |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
[21, 12, 9 | [21, 12, 9] | Close bracket. | Ruby |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
UPDATE users SET id='info' WHERE email=2 | UPDATE users SET id='info' WHERE email=2; | Add semicolon. | SQL |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
if b = 56 | if b == 56 | Use ==. | MATLAB |
class User {{ int index; }}; | class User {{ public: int index; }}; | Make public. | C++ |
int arr[6]; arr[6]=5; | int arr[6]; if(6<6){{}} else arr[6]=5; | Bounds check. | C++ |
if (c = 38) {{}} | if (c == 38) {{}} | Use ==. | Java |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
switch(a){{ case 38: break; }} | switch(a){{ case 38: break; default: break; }} | Add default case. | Java |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
int[] values = new int[26];
values[26] = 5; | int[] values = new int[26];
if (26 < values.length) values[26] = 5; | Check bounds. | Java |
<note><desc>info</desc><name>86</name></note | <note><desc>info</desc><name>86</name></note> | Add closing >. | XML |
let num: Int = 'info' | let num: String = 'info' | Fix type. | Swift |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
if (index = 6) | if (index == 6) | Use ==. | C++ |
if (data = 78) {{}} | if (data === 78) {{}} | Use === for equality. | JavaScript |
yield b | yield b | Correct yield. | Python |
for i=1,30 do print(i) end | for i=1,30 do print(i) end | Correct. | Lua |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
let v=vec![82,87,67]; let primary=&v[0]; v.push(17); | let mut v=vec![82,87,67]; let primary=v[0]; v.push(17); | Copy instead of reference. | Rust |
function handle(b:string){{return b;}} handle(7); | function handle(b:string){{return b;}} handle('output'); | Pass correct type. | TypeScript |
String item = 'hello'; | String item = "hello"; | Double quotes. | Java |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if num = 81 {{}} | if num == 81 {{}} | Use ==. | Swift |
object Item {{ def main(args: Array[String]) = println("hello") }} | object Item {{ def main(args: Array[String]): Unit = println("hello") }} | Add return type Unit. | Scala |
if ($count = 8) {{}} | if ($count -eq 8) {{}} | Use -eq. | PowerShell |
SELECT * FROM products WHRE email=25; | SELECT * FROM products WHERE email=25; | Fix WHERE. | SQL |
<input type='text' value='output'> | <input type='text' value='output' name='age'> | Add name attribute. | HTML |
$values[83] = 5; | if (isset($values[83])) $values[83] = 5; | Check existence. | PHP |
h1 {{ font-size:18px color:#333; }} | h1 {{ font-size:18px; color:#333; }} | Add semicolon. | CSS |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
match b {{ 1 => {{}} }} | match b {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
class Item {{ int b; }}
obj.b=5; | class Item {{ public int b; }}
obj.b=5; | Make field public. | Java |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
print 'value' | print 'value'; | Add semicolon. | Perl |
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