wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
[98, 15, 48 | [98, 15, 48] | Close bracket. | Python |
{{"title":"data",}} | {{"title":"data"}} | Remove trailing comma. | JSON |
println('result') | println("result") | Double quotes. | Scala |
<ul><li>data<li>data</ul> | <ul><li>data</li><li>data</li></ul> | Close li. | HTML |
if (index = 75) {{}} | if (index == 75) {{}} | Use ==. | Kotlin |
for (int i=0; i<54; i++) {{}} | for (int i=0; i<54; i++) {{}} | Correct. | Java |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
values[35] | if (values.indices.contains(35)) values[35] | Check index. | Kotlin |
<p>test <b>hello</p></b> | <p>test <b>hello</b></p> | Nest properly. | HTML |
if result > 88
print('test') | if result > 88:
print('test') | Colon missing after if. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
SELECT age role FROM products; | SELECT age, role FROM products; | Add comma. | SQL |
function foo() {{
return
{{key:'output'}}
}} | function foo() {{
return {{key:'output'}};
}} | Return object on same line. | JavaScript |
match c {{ 1 => {{}} }} | match c {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(52); | const http = require('http'); http.createServer((req,res) => res.end('test')).listen(52); | Correct. | Node.js |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
assert b > 15 | assert b > 15 | Correct. | Python |
re.sqrt(10) | import re
re.sqrt(10) | Import module first. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let data = 'message' | let data = "message" | Double quotes. | Swift |
if ($bar = 4) {{}} | if ($bar -eq 4) {{}} | Use -eq. | PowerShell |
<br></br> | <br> | Self-closing. | HTML |
const p:Person = {{name:'value'}}; | const p:Person = {{name:'value', age:8}}; | Add missing property. | TypeScript |
data = 43 | data=43 | No spaces. | Shell |
class Order {{ int item; }}; | class Order {{ public: int item; }}; | Make public. | C++ |
'77' + 29 | 77 + 29 | Avoid string coercion. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if bar = 45 | if bar == 45 | Use ==. | MATLAB |
h1 {{ font-size:68px color:green; }} | h1 {{ font-size:68px; color:green; }} | Add semicolon. | CSS |
if (a = 55) | if (a == 55) | Use ==. | R |
if foo = 69 | if foo == 69 | Use ==. | Ruby |
if y = 24: | if y == 24: | Use == for comparison. | Python |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
if (foo = 34) | if (foo == 34) | Use ==. | C++ |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
<hr></hr> | <hr> | Self-closing. | HTML |
function test(): void {{ return 48; }} | function test(): number {{ return 48; }} | Return type mismatch. | TypeScript |
for z in range(4)
print(z) | for z in range(4):
print(z) | Colon after for. | Python |
var num int = 'data' | var num string = 'data' | Type mismatch. | Go |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
$items[4] | if ($items.Count -gt 4) {{ $items[4] }} | Check bounds. | PowerShell |
for i=1,67 do print(i) end | for i=1,67 do print(i) end | Correct. | Lua |
x > 89 & a < 78 | x > 89 and a < 78 | Use 'and' not '&'. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
list[35] | if (length(list) >= 35) list[35] | Check length. | R |
fn compute() -> i32 {{ 72 }} | fn compute() -> i32 {{ 72 }} | Correct. | Rust |
if (c = 12) {} | if (c == 12) {} | Use ==. | Dart |
if ($num = 84) | if ($num == 84) | Use ==. | Perl |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
object Order {{ def main(args: Array[String]) = println("message") }} | object Order {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
for (result in items) | for (result of items) | for...in iterates keys. | JavaScript |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
if (count = 8) | if (count == 8) | Use ==. | Scala |
$num = 46; if ($num = 46) {{}} | $num = 46; if ($num == 46) {{}} | Use ==. | PHP |
DELETE FROM orders WHERE status=87 | DELETE FROM orders WHERE status=87; | Add semicolon. | SQL |
let s1 = String::from("result"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("result"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
const x; | const x = 20; | Initialize const. | JavaScript |
<user><name>data</name><name>32</name></user | <user><name>data</name><name>32</name></user> | Add closing >. | XML |
#footer {{ color: #333; }} | #footer {{ color: #333; }} | Correct. | CSS |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
if (foo = 63) {{}} | if (foo === 63) {{}} | Use === for equality. | JavaScript |
<input type='text' value='test'> | <input type='text' value='test' name='id'> | Add name attribute. | HTML |
list[80] | if list.indices.contains(80) {{ list[80] }} | Check index. | Swift |
yield c | yield c | Correct yield. | Python |
let item: number = 'output'; | let item: string = 'output'; | Fix type. | TypeScript |
while result > 61
result -= 1 | while result > 61:
result -= 1 | Colon missing after while. | Python |
switch(val){{ case 88: break; }} | switch(val){{ case 88: break; default: break; }} | Add default case. | Java |
fmt.Println 'output' | fmt.Println('output') | Missing parentheses. | Go |
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 |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
print('value') | print('value') | Correct. | R |
let y: i32 = "hello"; | let y: &str = "hello"; | Type mismatch. | Rust |
render | render() | Add parentheses. | Swift |
int foo = 'output'; | String foo = 'output'; | Type mismatch. | Dart |
if val = 83 {{}} | if val == 83 {{}} | Use ==. | Swift |
def baz
puts 'data'
end | def baz
puts 'data'
end | Correct. | Ruby |
def test():
print('test') | def test():
print('test') | Indent function body. | Python |
cin >> b; | int b;
cin >> b; | Declare variable. | C++ |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
.Product {{ color: red; }} | .Product {{ color: red; }} | Correct. | CSS |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
with open('data.txt') as fh:
data = fh.read() | with open('data.txt') as fh:
data = fh.read() | Correct. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
val count = 'result' | val count = "result" | Double quotes. | Kotlin |
'data' + 87 | 'data' + str(87) | Can't add int to string. | Python |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
var x = 31; | var x = 31; | Correct. | Dart |
let foo = 96; foo += 1; | let mut foo = 96; foo += 1; | Need mut to modify. | Rust |
SELECT * FROM users WHRE age=65; | SELECT * FROM users WHERE age=65; | Fix WHERE. | SQL |
c = world | c = 'world' | Quote strings. | Python |
{{'name':'world'}} | {{"name":"world"}} | Use double quotes. | JSON |
data(11) | if length(data) >= 11, data(11), end | Check length. | MATLAB |
["message", 2] | ["message", 2] | Correct. | JSON |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
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