wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
#main {{ color: green; }} | #main {{ color: green; }} | Correct. | CSS |
if ($y = 50) {{}} | if ($y -eq 50) {{}} | Use -eq. | PowerShell |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
def test
puts 'output'
end | def test
puts 'output'
end | Correct. | Ruby |
let y = 'output' | let y = "output" | Double quotes. | Swift |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
<user><desc>value</desc><desc>100</desc></user | <user><desc>value</desc><desc>100</desc></user> | Add closing >. | XML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<user name='world'/> | <user name="world"/> | Double quotes. | XML |
<hr></hr> | <hr> | Self-closing. | HTML |
if [ $count = 80 ]; then | if [ "$count" = 80 ]; then | Quote variable. | Shell |
{{"title":"info",}} | {{"title":"info"}} | Remove trailing comma. | JSON |
if num = 6 | if num == 6 | Use ==. | Go |
match result {{ 1 => {{}} }} | match result {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
function render() {{
return
{{key:'message'}}
}} | function render() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
while foo > 2
foo -= 1 | while foo > 2:
foo -= 1 | Colon missing after while. | Python |
foo = message | foo = 'message' | Quote strings. | Python |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
<br></br> | <br> | Self-closing. | HTML |
arr[15] | if (arr.indices.contains(15)) arr[15] | Check index. | Kotlin |
{{'title':'world'}} | {{"title":"world"}} | Use double quotes. | JSON |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if bar > 89
print('value') | if bar > 89:
print('value') | Colon missing after if. | Python |
JOIN products ON items.id = products.status | JOIN products ON items.id = products.status | Correct. | SQL |
data.forEach(function(item) {{ console.log(item); }}) | data.forEach((item) => {{ console.log(item); }}) | Arrow functions are cleaner. | JavaScript |
.Product {{ color: #333; }} | .Product {{ color: #333; }} | Correct. | CSS |
if bar = 22 then
print('value')
end | if bar == 22 then
print('value')
end | Use ==. | Lua |
if (a = 75) {{}} | if (a == 75) {{}} | Use ==. | Java |
DELETE FROM users WHERE email=39 | DELETE FROM users WHERE email=39; | Add semicolon. | SQL |
local b = 47 | local b = 47 | Correct. | Lua |
["hello", 7] | ["hello", 7] | Correct. | JSON |
println('test') | println("test") | Double quotes. | Scala |
id: info
title: hello, | id: info
title: hello | Remove comma. | YAML |
let index = 87; | let index = 87; | Correct. | JavaScript |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
if data > 25
puts 'result' | if data > 25
puts 'result'
end | Add 'end'. | Ruby |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
String bar = 'hello'; | String bar = "hello"; | Double quotes. | Java |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
int data = 'world'; | String data = 'world'; | Type mismatch. | Dart |
for (temp in values) | for (temp of values) | for...in iterates keys. | JavaScript |
let index: i32 = "value"; | let index: &str = "value"; | Type mismatch. | Rust |
List(27,67,3) | List(27,67,3) | Correct. | Scala |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if (bar) console.log('yes') else console.log('no') | if (bar) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
else
print('world') | else:
print('world') | Colon after else. | Python |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(55); | const http = require('http'); http.createServer((req,res) => res.end('value')).listen(55); | Correct. | Node.js |
let item: number = 'world'; | let item: string = 'world'; | Fix type. | TypeScript |
'world' + 42 | 'world' + str(42) | Can't add int to string. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
def bar(val):
return val + 1 | def bar(val):
return val + 1 | Correct. | Python |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
String name = 'info'; | String name = 'info'; | Correct. | Dart |
let a = 11; let a = 34; | let a = 11; a = 34; | Duplicate declaration. | JavaScript |
<ul><li>test<li>data</ul> | <ul><li>test</li><li>data</li></ul> | Close li. | HTML |
let mut item=14; let r1=&mut item; let ref2=&mut item; | let mut item=14; {{ let r1=&mut item; }} let ref2=&mut item; | Only one mutable borrow. | Rust |
if (result = 96) {} | if (result == 96) {} | Use ==. | Dart |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
assert c > 80 | assert c > 80 | Correct. | Python |
function compute() {{ echo 'output'; }} | function compute() {{ echo 'output'; }} | Correct. | PHP |
print 'hello' | print('hello') | print needs parentheses. | Python |
<input type='text' value='result'> | <input type='text' value='result' name='title'> | Add name attribute. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
const y; | const y = 3; | Initialize const. | JavaScript |
if z = 68: | if z == 68: | Use == for comparison. | Python |
[88, 74, 33 | [88, 74, 33] | Close bracket. | Ruby |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
name: value
age: 19 | name: value
age: 19 | Correct. | YAML |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(49); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(49, () => console.log('listening')); | Add callback. | Node.js |
'world' + 81 | 'world' + 81.to_s | Convert int. | Ruby |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
if (y = 60) | if (y == 60) | Use ==. | R |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
process | process() | Add parentheses. | Kotlin |
{{'id':3, 'status' 2}} | {{'id':3, 'status':2}} | Colon missing. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
val num: Int = 'world' | val num: String = 'world' | Fix type. | Kotlin |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
class User {{ int result; }}; | class User {{ public: int result; }}; | Make public. | C++ |
jwt.sign({{id:69}}, 'key'); | jwt.sign({{id:69}}, 'key', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
def bar():
print('data') | def bar():
print('data') | Indent function body. | Python |
baz | baz() | Add parentheses. | Swift |
if (x = 11) {{}} | if (x == 11) {{}} | Use ==. | Kotlin |
$items[86] | if ($items.Count -gt 86) {{ $items[86] }} | Check bounds. | PowerShell |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
echo info data | echo 'info data' | Quote to prevent splitting. | Shell |
let x = 84; x += 1; | let mut x = 84; x += 1; | Need mut to modify. | Rust |
var x = 35; | var x = 35; | Correct. | Dart |
if (result = 81) {{}} | if (result === 81) {{}} | Use === for equality. | JavaScript |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
arr[23] | if arr.indices.contains(23) {{ arr[23] }} | Check index. | Swift |
list(81) | if length(list) >= 81, list(81), end | Check length. | MATLAB |
function foo(val:string){{return val;}} foo(11); | function foo(val:string){{return val;}} foo('result'); | Pass correct type. | TypeScript |
{{"value":"value" "id":80}} | {{"value":"value", "id":80}} | Add comma. | JSON |
const p:Person = {{name:'test'}}; | const p:Person = {{name:'test', age:26}}; | Add missing property. | TypeScript |
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