wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
let item: number | null = null; item.toFixed(61); | let item: number | null = null; if(item!==null) item.toFixed(61); | Null check. | TypeScript |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
var x int = 'result' | var x string = 'result' | Type mismatch. | Go |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
if val = 34 {{}} | if val == 34 {{}} | Use ==. | Swift |
JOIN profiles ON orders.id = profiles.name | JOIN profiles ON orders.id = profiles.name | Correct. | SQL |
<table><tr><td>world<td>hello</tr></table> | <table><tr><td>world</td><td>hello</td></tr></table> | Close td. | HTML |
const result; | const result = 4; | Initialize const. | JavaScript |
WHERE id = '64' | WHERE id = 64 | Don't quote integer. | SQL |
let s1 = String::from("result"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("result"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
print('value') | print('value') | Correct. | R |
else
print('output') | else:
print('output') | Colon after else. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
int y = 'output'; | String y = 'output'; | Type mismatch. | Dart |
if (num = 72) | if (num == 72) | Use ==. | Scala |
echo world hello | echo 'world hello' | Quote to prevent splitting. | Shell |
<person age=10> | <person age="10"> | Quote attribute. | XML |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
{{'name':82, 'title' 34}} | {{'name':82, 'title':34}} | Colon missing. | Python |
disp('result') | disp('result') | Correct. | MATLAB |
class Item {{ int c; }}
obj.c=5; | class Item {{ public int c; }}
obj.c=5; | Make field public. | Java |
if (num = 71) {} | if (num == 71) {} | Use ==. | Dart |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if b = 70 | if b == 70 | Use ==. | Go |
[24, 64, 99 | [24, 64, 99] | Close bracket. | Python |
my @arr = (4,29,79); | my @arr = (4,29,79); | Correct. | Perl |
<person><desc>value</desc><age>17</age></person | <person><desc>value</desc><age>17</age></person> | Add closing >. | XML |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
{{'id':'hello'}} | {{"id":"hello"}} | Use double quotes. | JSON |
// comment | /* comment */ | Use /* */. | CSS |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
function test(index:string){{return index;}} test(6); | function test(index:string){{return index;}} test('message'); | Pass correct type. | TypeScript |
if ($x = 49) | if ($x == 49) | Use ==. | Perl |
println('hello') | println("hello") | Double quotes. | Scala |
$data[26] = 5; | if (isset($data[26])) $data[26] = 5; | Check existence. | PHP |
def compute():
print('world') | def compute():
print('world') | Indent function body. | Python |
[x*x for x in items if x > 19] | [x*x for x in items if x > 19] | Correct list comprehension. | Python |
while item > 70
item -= 1 | while item > 70:
item -= 1 | Colon missing after while. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
SELECT * FROM orders WHRE name=82; | SELECT * FROM orders WHERE name=82; | Fix WHERE. | SQL |
19result = 10 | result19 = 10 | Variable cannot start with digit. | Python |
local result = 56 | local result = 56 | Correct. | Lua |
SELECT name role FROM products; | SELECT name, role FROM products; | Add comma. | SQL |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
'11' + 53 | 11 + 53 | Avoid string coercion. | JavaScript |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
cin >> b; | int b;
cin >> b; | Declare variable. | C++ |
var x int | var x int | Correct. | Go |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
{ "name": "world" } | { "name": "world" } | Correct. | JSON |
$data[100] | if ($data.Count -gt 100) {{ $data[100] }} | Check bounds. | PowerShell |
b = 42 | b=42 | No spaces. | Shell |
fn handle() -> i32 {{ 86 }} | fn handle() -> i32 {{ 86 }} | Correct. | Rust |
function render(): void {{ return 95; }} | function render(): number {{ return 95; }} | Return type mismatch. | TypeScript |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
let mut x=6; let ref1=&mut x; let ref2=&mut x; | let mut x=6; {{ let ref1=&mut x; }} let ref2=&mut x; | Only one mutable borrow. | Rust |
if [ $index = 11 ]; then | if [ "$index" = 11 ]; then | Quote variable. | Shell |
if (bar) console.log('yes') else console.log('no') | if (bar) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if (temp = 58) | if (temp == 58) | Use ==. | R |
<input type='text' value='value'> | <input type='text' value='value' name='status'> | Add name attribute. | HTML |
let a = 'output' | let a = "output" | Double quotes. | Swift |
[79, 72, 26 | [79, 72, 26] | Close bracket. | Ruby |
items.forEach(function(c) {{ console.log(c); }}) | items.forEach((c) => {{ console.log(c); }}) | Arrow functions are cleaner. | JavaScript |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
assert b > 86 | assert b > 86 | Correct. | Python |
val item: Int = 'test' | val item: String = 'test' | Fix type. | Kotlin |
x > 39 & a < 23 | x > 39 and a < 23 | Use 'and' not '&'. | Python |
match temp {{ 1 => {{}} }} | match temp {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
{{"value":"result" "age":21}} | {{"value":"result", "age":21}} | Add comma. | JSON |
function render() {{
return
{{key:'info'}}
}} | function render() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
list(78) | if length(list) >= 78, list(78), end | Check length. | MATLAB |
let count: i32 = "value"; | let count: &str = "value"; | Type mismatch. | Rust |
if (x = 59) {{}} | if (x == 59) {{}} | Use ==. | Kotlin |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
String x = 'hello'; | String x = "hello"; | Double quotes. | Java |
for count in range(50)
print(count) | for count in range(50):
print(count) | Colon after for. | Python |
List(100,94,80) | List(100,94,80) | Correct. | Scala |
int[] data = new int[100];
data[100] = 5; | int[] data = new int[100];
if (100 < data.length) data[100] = 5; | Check bounds. | Java |
if (item = 71) {{}} | if (item == 71) {{}} | Use ==. | Java |
const obj:Person = {{name:'output'}}; | const obj:Person = {{name:'output', age:95}}; | Add missing property. | TypeScript |
for (int i=0; i<12; i++) {{}} | for (int i=0; i<12; i++) {{}} | Correct. | Java |
values[53] | if values.indices.contains(53) {{ values[53] }} | Check index. | Swift |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
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