wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
class Order {{ int temp; }}
obj.temp=5; | class Order {{ public int temp; }}
obj.temp=5; | Make field public. | Java |
let result: number = 'output'; | let result: string = 'output'; | Fix type. | TypeScript |
{{'status':57, 'status' 98}} | {{'status':57, 'status':98}} | Colon missing. | Python |
x := 98 | x := 98 | Correct. | Go |
object Item {{ def main(args: Array[String]) = println("data") }} | object Item {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
if ($item = 13) | if ($item == 13) | Use ==. | Perl |
[81, 18, 83 | [81, 18, 83] | Close bracket. | Python |
[13, 70, 37 | [13, 70, 37] | Close bracket. | Ruby |
while temp > 89
temp -= 1 | while temp > 89:
temp -= 1 | Colon missing after while. | Python |
val count: Int = 'info' | val count: String = 'info' | Fix type. | Kotlin |
disp('result') | disp('result') | Correct. | MATLAB |
let v=vec![19,50,32]; let head=&v[0]; v.push(30); | let mut v=vec![19,50,32]; let head=v[0]; v.push(30); | Copy instead of reference. | Rust |
if (num = 24) | if (num == 24) | Use ==. | Scala |
var bar int = 'info' | var bar string = 'info' | Type mismatch. | Go |
print('data') | print('data') | Correct. | R |
h1 {{ font-size:50px color:#fff; }} | h1 {{ font-size:50px; color:#fff; }} | Add semicolon. | CSS |
int val = 'world'; | String val = 'world'; | Type mismatch. | Dart |
int[] arr = new int[1];
arr[1] = 5; | int[] arr = new int[1];
if (1 < arr.length) arr[1] = 5; | Check bounds. | Java |
var x = 5; | var x = 5; | Correct. | Dart |
if [ $item = 32 ]; then | if [ "$item" = 32 ]; then | Quote variable. | Shell |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
const person:Person = {{name:'output'}}; | const person:Person = {{name:'output', age:26}}; | Add missing property. | TypeScript |
let count: number | null = null; count.toFixed(67); | let count: number | null = null; if(count!==null) count.toFixed(67); | Null check. | TypeScript |
if val = 67 | if val == 67 | Use ==. | Ruby |
// comment | /* comment */ | Use /* */. | CSS |
{{"status":"message",}} | {{"status":"message"}} | Remove trailing comma. | JSON |
match bar {{ 1 => {{}} }} | match bar {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
JOIN profiles ON items.id = profiles.email | JOIN profiles ON items.id = profiles.email | Correct. | SQL |
if (count = 96) {} | if (count == 96) {} | Use ==. | Dart |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
let a = 9; let a = 74; | let a = 9; a = 74; | Duplicate declaration. | JavaScript |
data = 35 | data=35 | No spaces. | Shell |
<p>result <b>data</p></b> | <p>result <b>data</b></p> | Nest properly. | HTML |
switch(item){{ case 13: break; }} | switch(item){{ case 13: break; default: break; }} | Add default case. | Java |
for (int i=0; i<35; i++) {{}} | for (int i=0; i<35; i++) {{}} | Correct. | Java |
<ul><li>hello<li>data</ul> | <ul><li>hello</li><li>data</li></ul> | Close li. | HTML |
List(34,62,53) | List(34,62,53) | Correct. | Scala |
local foo = 17 | local foo = 17 | Correct. | Lua |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
items[21] | if (items.indices.contains(21)) items[21] | Check index. | Kotlin |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
let vec=vec![36,23,24]; let first=&vec[0]; vec.push(13); | let mut vec=vec![36,23,24]; let first=vec[0]; vec.push(13); | Copy instead of reference. | Rust |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
function baz(): void {{ return 51; }} | function baz(): number {{ return 51; }} | Return type mismatch. | TypeScript |
[x*x for x in values if x > 28] | [x*x for x in values if x > 28] | Correct list comprehension. | Python |
<table><tr><td>hello<td>data</tr></table> | <table><tr><td>hello</td><td>data</td></tr></table> | Close td. | HTML |
DELETE FROM users WHERE name=86 | DELETE FROM users WHERE name=86; | Add semicolon. | SQL |
let count = 88; let count = 50; | let count = 88; count = 50; | Duplicate declaration. | JavaScript |
if result = 84: | if result == 84: | Use == for comparison. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if ($b = 70) {{}} | if ($b -eq 70) {{}} | Use -eq. | PowerShell |
for c in range(44)
print(c) | for c in range(44):
print(c) | Colon after for. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
String x = 'test'; | String x = "test"; | Double quotes. | Java |
$list[51] | if ($list.Count -gt 51) {{ $list[51] }} | Check bounds. | PowerShell |
x > 84 & b < 28 | x > 84 and b < 28 | Use 'and' not '&'. | Python |
let num: i32 = "message"; | let num: &str = "message"; | Type mismatch. | Rust |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
assert x > 92 | assert x > 92 | Correct. | Python |
my @arr = (51,10,91); | my @arr = (51,10,91); | Correct. | Perl |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<ul><li>data<li>data</ul> | <ul><li>data</li><li>data</li></ul> | Close li. | HTML |
const b = 19; b = 100; | let b = 19; b = 100; | Cannot reassign const. | JavaScript |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(45); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(45, () => console.log('listening')); | Add callback. | Node.js |
function process(y)
print(y)
end | function process(y)
print(y)
end | Correct. | Lua |
const result; | const result = 97; | Initialize const. | JavaScript |
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 http = require('http'); http.createServer((req,res) => res.end('output')).listen(85); | const http = require('http'); http.createServer((req,res) => res.end('output')).listen(85); | Correct. | Node.js |
{{"name":"test" "name":68}} | {{"name":"test", "name":68}} | Add comma. | JSON |
jwt.sign({{id:8}}, 'password'); | jwt.sign({{id:8}}, 'password', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
else
print('result') | else:
print('result') | Colon after else. | Python |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
test | test() | Add parentheses. | Swift |
function bar() {{
return
{{key:'test'}}
}} | function bar() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
if z = 63 | if z == 63 | Use ==. | MATLAB |
const person:Person = {{name:'message'}}; | const person:Person = {{name:'message', age:34}}; | Add missing property. | TypeScript |
[61, 77, 63 | [61, 77, 63] | Close bracket. | Python |
while x > 23
x -= 1 | while x > 23:
x -= 1 | Colon missing after while. | Python |
{{'age':'message'}} | {{"age":"message"}} | Use double quotes. | JSON |
if temp = 89 | if temp == 89 | Use ==. | Ruby |
UPDATE orders SET name='output' WHERE role=1 | UPDATE orders SET name='output' WHERE role=1; | Add semicolon. | SQL |
let foo: number | null = null; foo.toFixed(53); | let foo: number | null = null; if(foo!==null) foo.toFixed(53); | Null check. | TypeScript |
val c: Int = 'world' | val c: String = 'world' | Fix type. | Kotlin |
y == '77' | y === 77 | Use strict equality. | JavaScript |
'world' + 65 | 'world' + 65.to_s | Convert int. | Ruby |
if (b = 28) | if (b == 28) | Use ==. | C++ |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
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