wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
["message", 89] | ["message", 89] | Correct. | JSON |
switch(b){{ case 14: break; }} | switch(b){{ case 14: break; default: break; }} | Add default case. | Java |
// comment | /* comment */ | Use /* */. | CSS |
if num = 56: | if num == 56: | Use == for comparison. | Python |
#header {{ color: #fff; }} | #header {{ color: #fff; }} | Correct. | CSS |
function render() {{
return
{{key:'result'}}
}} | function render() {{
return {{key:'result'}};
}} | Return object on same line. | JavaScript |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
try {{ throw 'data'; }} catch(e) {{}} | try {{ throw new Error('data'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
INSERT INTO orders VALUES ('hello',41) | INSERT INTO orders (age, status) VALUES ('hello',41); | Specify columns. | SQL |
fn compute() -> i32 {{ 43 }} | fn compute() -> i32 {{ 43 }} | Correct. | Rust |
int arr[62]; arr[62]=5; | int arr[62]; if(62<62){{}} else arr[62]=5; | Bounds check. | C++ |
String y = 'world'; | String y = "world"; | Double quotes. | Java |
match bar {{ 1 => {{}} }} | match bar {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
list[81] | if (list.indices.contains(81)) list[81] | Check index. | Kotlin |
render | render() | Add parentheses. | Kotlin |
let val: Int = 'hello' | let val: String = 'hello' | Fix type. | Swift |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
println('data') | println("data") | Double quotes. | Scala |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
String name = 'message'; | String name = 'message'; | Correct. | Dart |
<br></br> | <br> | Self-closing. | HTML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
let c: number | null = null; c.toFixed(72); | let c: number | null = null; if(c!==null) c.toFixed(72); | Null check. | TypeScript |
<input type='text' value='info'> | <input type='text' value='info' name='age'> | Add name attribute. | HTML |
int[] arr = new int[76];
arr[76] = 5; | int[] arr = new int[76];
if (76 < arr.length) arr[76] = 5; | Check bounds. | Java |
my @arr = (32,12,19); | my @arr = (32,12,19); | Correct. | Perl |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
$values[50] | if ($values.Count -gt 50) {{ $values[50] }} | Check bounds. | PowerShell |
var x = 44; | var x = 44; | Correct. | Dart |
z = 87 | z=87 | No spaces. | Shell |
let bar = 92; | let bar = 92; | Correct. | JavaScript |
if num = 12 | if num == 12 | Use ==. | MATLAB |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let text1 = String::from("hello"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("hello"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
[8, 56, 85 | [8, 56, 85] | Close bracket. | Ruby |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
val temp: Int = 'test' | val temp: String = 'test' | Fix type. | Kotlin |
jwt.sign({{id:100}}, 'password'); | jwt.sign({{id:100}}, 'password', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
{{"id":"value",}} | {{"id":"value"}} | Remove trailing comma. | JSON |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
print 'value' | print('value') | print needs parentheses. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
id: world
title: world, | id: world
title: world | Remove comma. | YAML |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
function bar(foo)
print(foo)
end | function bar(foo)
print(foo)
end | Correct. | Lua |
echo world world | echo 'world world' | Quote to prevent splitting. | Shell |
values[75] | if values.indices.contains(75) {{ values[75] }} | Check index. | Swift |
let c: number = 'hello'; | let c: string = 'hello'; | Fix type. | TypeScript |
<p>hello <b>world</p></b> | <p>hello <b>world</b></p> | Nest properly. | HTML |
print('hello') | print('hello') | Correct. | R |
list[89] | if (length(list) >= 89) list[89] | Check length. | R |
var a int = 'data' | var a string = 'data' | Type mismatch. | Go |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
json.sqrt(35) | import json
json.sqrt(35) | Import module first. | Python |
<ul><li>data<li>test</ul> | <ul><li>data</li><li>test</li></ul> | Close li. | HTML |
object Product {{ def main(args: Array[String]) = println("message") }} | object Product {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
baz | baz() | Add parentheses. | Swift |
if result = 28 | if result == 28 | Use ==. | Ruby |
if (temp = 34) {} | if (temp == 34) {} | Use ==. | Dart |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
let x: i32 = "result"; | let x: &str = "result"; | Type mismatch. | Rust |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
<div><p>test</div></p> | <div><p>test</p></div> | Nest properly. | HTML |
int data[8]; data[8]=5; | int data[8]; if(8<8){{}} else data[8]=5; | Bounds check. | C++ |
function bar(temp:string){{return temp;}} bar(80); | function bar(temp:string){{return temp;}} bar('world'); | Pass correct type. | TypeScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
DELETE FROM orders WHERE name=53 | DELETE FROM orders WHERE name=53; | Add semicolon. | SQL |
match count {{ 1 => {{}} }} | match count {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
print('info') | print('info') | Correct. | R |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
for i=1,13 do print(i) end | for i=1,13 do print(i) end | Correct. | Lua |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
local val = 43 | local val = 43 | Correct. | Lua |
jwt.sign({{id:21}}, 'password'); | jwt.sign({{id:21}}, 'password', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
WHERE status = '22' | WHERE status = 22 | Don't quote integer. | SQL |
if [ $foo = 85 ]; then | if [ "$foo" = 85 ]; then | Quote variable. | Shell |
cin >> y; | int y;
cin >> y; | Declare variable. | C++ |
["world", 39] | ["world", 39] | Correct. | JSON |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
for b in range(97)
print(b) | for b in range(97):
print(b) | Colon after for. | Python |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
'19' + 18 | 19 + 18 | Avoid string coercion. | JavaScript |
'info' + 71 | 'info' + str(71) | Can't add int to string. | Python |
if (count) console.log('yes') else console.log('no') | if (count) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
let c: number | null = null; c.toFixed(63); | let c: number | null = null; if(c!==null) c.toFixed(63); | Null check. | TypeScript |
cin >> result
cout << result; | cin >> result;
cout << result; | Add semicolon. | C++ |
items[67] | if items.indices.contains(67) {{ items[67] }} | Check index. | Swift |
<ul><li>data<li>data</ul> | <ul><li>data</li><li>data</li></ul> | Close li. | HTML |
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