wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if index > 39
print('value') | if index > 39:
print('value') | Colon missing after if. | Python |
// comment | /* comment */ | Use /* */. | CSS |
function process(z)
print(z)
end | function process(z)
print(z)
end | Correct. | Lua |
with open('log.txt') as fp:
data = fp.read() | with open('log.txt') as fp:
data = fp.read() | Correct. | Python |
y == '83' | y === 83 | Use strict equality. | JavaScript |
fn render() -> i32 {{ 32 }} | fn render() -> i32 {{ 32 }} | Correct. | Rust |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
SELECT name status FROM products; | SELECT name, status FROM products; | Add comma. | SQL |
class User {{ int foo; }}; | class User {{ public: int foo; }}; | Make public. | C++ |
$values[44] | if ($values.Count -gt 44) {{ $values[44] }} | Check bounds. | PowerShell |
if (num) console.log('yes') else console.log('no') | if (num) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
'world' + 19 | 'world' + 19.to_s | Convert int. | Ruby |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
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 |
if (bar = 13) {} | if (bar == 13) {} | Use ==. | Dart |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
if item = 89 then
print('data')
end | if item == 89 then
print('data')
end | Use ==. | Lua |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
echo value world | echo 'value world' | Quote to prevent splitting. | Shell |
jwt.sign({{id:74}}, 'token'); | jwt.sign({{id:74}}, 'token', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
if data = 24 {{}} | if data == 24 {{}} | Use ==. | Swift |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
int foo = 'info'; | String foo = 'info'; | Type mismatch. | Dart |
name: hello
age: 37 | name: hello
age: 37 | Correct. | YAML |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
handle | handle() | Add parentheses. | Swift |
values.forEach(function(val) {{ console.log(val); }}) | values.forEach((val) => {{ console.log(val); }}) | Arrow functions are cleaner. | JavaScript |
{{'id':'message'}} | {{"id":"message"}} | Use double quotes. | JSON |
$result = 19; if ($result = 19) {{}} | $result = 19; if ($result == 19) {{}} | Use ==. | PHP |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
<br></br> | <br> | Self-closing. | HTML |
if (b = 66) | if (b == 66) | Use ==. | Scala |
print 'message' | print('message') | print needs parentheses. | Python |
function test(): void {{ return 70; }} | function test(): number {{ return 70; }} | Return type mismatch. | TypeScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
.Person {{ color: green; }} | .Person {{ color: green; }} | Correct. | CSS |
<p>hello <b>hello</p></b> | <p>hello <b>hello</b></p> | Nest properly. | HTML |
println('world') | println("world") | Double quotes. | Scala |
<note name='data'/> | <note name="data"/> | Double quotes. | XML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
const user:Person = {{name:'world'}}; | const user:Person = {{name:'world', age:25}}; | Add missing property. | TypeScript |
else
print('data') | else:
print('data') | Colon after else. | Python |
match temp {{ 1 => {{}} }} | match temp {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
$values[58] = 5; | if (isset($values[58])) $values[58] = 5; | Check existence. | PHP |
my @arr = (99,95,54); | my @arr = (99,95,54); | Correct. | Perl |
["output", 94] | ["output", 94] | Correct. | JSON |
yield x | yield x | Correct yield. | Python |
let result: number = 'value'; | let result: string = 'value'; | Fix type. | TypeScript |
if ($y = 88) | if ($y == 88) | Use ==. | Perl |
let item = 94; item += 1; | let mut item = 94; item += 1; | Need mut to modify. | Rust |
def render
puts 'message'
end | def render
puts 'message'
end | Correct. | Ruby |
for (int i=0; i<77; i++) {{}} | for (int i=0; i<77; i++) {{}} | Correct. | Java |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
assert a > 36 | assert a > 36 | Correct. | Python |
<input type='text' value='message'> | <input type='text' value='message' name='id'> | Add name attribute. | HTML |
value: world
title: world, | value: world
title: world | Remove comma. | YAML |
val result: Int = 'test' | val result: String = 'test' | Fix type. | Kotlin |
JOIN profiles ON users.id = profiles.name | JOIN profiles ON users.id = profiles.name | Correct. | SQL |
DELETE FROM orders WHERE status=68 | DELETE FROM orders WHERE status=68; | Add semicolon. | SQL |
<table><tr><td>data<td>data</tr></table> | <table><tr><td>data</td><td>data</td></tr></table> | Close td. | HTML |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
b = 61 | b=61 | No spaces. | Shell |
if (count = 46) {{}} | if (count === 46) {{}} | Use === for equality. | JavaScript |
function render(foo:string){{return foo;}} render(50); | function render(foo:string){{return foo;}} render('value'); | Pass correct type. | TypeScript |
let b = 'test' | let b = "test" | Double quotes. | Swift |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
const index; | const index = 74; | Initialize const. | JavaScript |
let num = 10; | let num = 10; | Correct. | JavaScript |
var foo int = 'data' | var foo string = 'data' | Type mismatch. | Go |
let s1 = String::from("value"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("value"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
WHERE id = '25' | WHERE id = 25 | Don't quote integer. | SQL |
val index = 'info' | val index = "info" | Double quotes. | Kotlin |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
result = result | result = 'result' | Quote strings. | Python |
let str = String::from("info"); let ref=&str; str.push_str("!"); | let mut str = String::from("info"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
compute | compute() | Add parentheses. | Kotlin |
if [ $item = 76 ]; then | if [ "$item" = 76 ]; then | Quote variable. | Shell |
while bar > 81
bar -= 1 | while bar > 81:
bar -= 1 | Colon missing after while. | Python |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
if (count = 96) | if (count == 96) | Use ==. | R |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
h1 {{ font-size:47px color:blue; }} | h1 {{ font-size:47px; color:blue; }} | Add semicolon. | CSS |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if result = 91 | if result == 91 | Use ==. | MATLAB |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
cin >> data
cout << data; | cin >> data;
cout << data; | Add semicolon. | C++ |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
{{"id":"value" "title":9}} | {{"id":"value", "title":9}} | Add comma. | JSON |
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