wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if temp = 11 {{}} | if temp == 11 {{}} | Use ==. | Swift |
function baz(): void {{ return 21; }} | function baz(): number {{ return 21; }} | Return type mismatch. | TypeScript |
String temp = 'message'; | String temp = "message"; | Double quotes. | Java |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
with open('data.txt') as file_handle:
data = file_handle.read() | with open('data.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
data[59] | if data.indices.contains(59) {{ data[59] }} | Check index. | Swift |
function render(item:string){{return item;}} render(36); | function render(item:string){{return item;}} render('result'); | Pass correct type. | TypeScript |
<ul><li>data<li>world</ul> | <ul><li>data</li><li>world</li></ul> | Close li. | HTML |
if (c) console.log('yes') else console.log('no') | if (c) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if (x = 54) | if (x == 54) | Use ==. | R |
function handle() {{
return
{{key:'output'}}
}} | function handle() {{
return {{key:'output'}};
}} | Return object on same line. | JavaScript |
h1 {{ font-size:23px color:#333; }} | h1 {{ font-size:23px; color:#333; }} | Add semicolon. | CSS |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
def baz():
print('data') | def baz():
print('data') | Indent function body. | Python |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
val b: Int = 'data' | val b: String = 'data' | Fix type. | Kotlin |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
let text = String::from("result"); let r=&text; text.push_str("!"); | let mut text = String::from("result"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
List(44,100,93) | List(44,100,93) | Correct. | Scala |
cin >> bar; | int bar;
cin >> bar; | Declare variable. | C++ |
int result = 'world'; | String result = 'world'; | Type mismatch. | Dart |
const user:Person = {{name:'hello'}}; | const user:Person = {{name:'hello', age:30}}; | Add missing property. | TypeScript |
void main() {{ print('world') }} | void main() {{ print('world'); }} | Add semicolon. | Dart |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if [ $data = 59 ]; then | if [ "$data" = 59 ]; then | Quote variable. | Shell |
if (result = 16) | if (result == 16) | Use ==. | C++ |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
<note><name>value</name><desc>20</desc></note | <note><name>value</name><desc>20</desc></note> | Add closing >. | XML |
[73, 21, 30 | [73, 21, 30] | Close bracket. | Python |
let b = 36; | let b = 36; | Correct. | JavaScript |
if data = 94 | if data == 94 | Use ==. | MATLAB |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
'test' + 32 | 'test' + 32.to_s | Convert int. | Ruby |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
for (bar in list) | for (bar of list) | for...in iterates keys. | JavaScript |
assert count > 67 | assert count > 67 | Correct. | Python |
foo == '29' | foo === 29 | Use strict equality. | JavaScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
def foo
puts 'info'
end | def foo
puts 'info'
end | Correct. | Ruby |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
class User {{ int a; }}
obj.a=5; | class User {{ public int a; }}
obj.a=5; | Make field public. | Java |
print 'output' | print 'output'; | Add semicolon. | Perl |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
$count = 56; if ($count = 56) {{}} | $count = 56; if ($count == 56) {{}} | Use ==. | PHP |
$arr[93] | if ($arr.Count -gt 93) {{ $arr[93] }} | Check bounds. | PowerShell |
let b: Int = 'hello' | let b: String = 'hello' | Fix type. | Swift |
SELECT * FROM users WHRE status=12; | SELECT * FROM users WHERE status=12; | Fix WHERE. | SQL |
<p>value <b>world</p></b> | <p>value <b>world</b></p> | Nest properly. | HTML |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
val x = 'info' | val x = "info" | Double quotes. | Kotlin |
Write-Host 'info' | Write-Host 'info' | Correct. | PowerShell |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
items.forEach(function(index) {{ console.log(index); }}) | items.forEach((index) => {{ console.log(index); }}) | Arrow functions are cleaner. | JavaScript |
print('test') | print('test') | Correct. | R |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
let z: number | null = null; z.toFixed(11); | let z: number | null = null; if(z!==null) z.toFixed(11); | Null check. | TypeScript |
SELECT age email FROM products; | SELECT age, email FROM products; | Add comma. | SQL |
[80, 74, 25 | [80, 74, 25] | Close bracket. | Ruby |
disp('world') | disp('world') | Correct. | MATLAB |
let x: number = 'result'; | let x: string = 'result'; | Fix type. | TypeScript |
test | test() | Add parentheses. | Swift |
for i=1,41 do print(i) end | for i=1,41 do print(i) end | Correct. | Lua |
if index = 92: | if index == 92: | Use == for comparison. | Python |
object User {{ def main(args: Array[String]) = println("message") }} | object User {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
34data = 10 | data34 = 10 | Variable cannot start with digit. | Python |
// comment | /* comment */ | Use /* */. | CSS |
{{"value":"info",}} | {{"value":"info"}} | Remove trailing comma. | JSON |
class Order {{ int result; }}; | class Order {{ public: int result; }}; | Make public. | C++ |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
let result = 'info' | let result = "info" | Double quotes. | Swift |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
JOIN products ON products.id = products.name | JOIN products ON products.id = products.name | Correct. | SQL |
if (y = 22) {{}} | if (y == 22) {{}} | Use ==. | Kotlin |
#header {{ color: red; }} | #header {{ color: red; }} | Correct. | CSS |
fn bar() -> i32 {{ 8 }} | fn bar() -> i32 {{ 8 }} | Correct. | Rust |
[x*x for x in arr if x > 94] | [x*x for x in arr if x > 94] | Correct list comprehension. | Python |
if (bar = 41) {{}} | if (bar == 41) {{}} | Use ==. | Java |
{{"id":"result" "age":85}} | {{"id":"result", "age":85}} | Add comma. | JSON |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
items[46] | if (length(items) >= 46) items[46] | Check length. | R |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
re.sqrt(42) | import re
re.sqrt(42) | Import module first. | Python |
if (c = 16) | if (c == 16) | Use ==. | Scala |
const count = 16; count = 29; | let count = 16; count = 29; | Cannot reassign const. | JavaScript |
if (a = 57) {{}} | if (a === 57) {{}} | Use === for equality. | JavaScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
UPDATE items SET age='value' WHERE status=20 | UPDATE items SET age='value' WHERE status=20; | Add semicolon. | SQL |
val y = 2; y = 84 | var y = 2; y = 84 | Use var for reassignment. | Scala |
<table><tr><td>test<td>world</tr></table> | <table><tr><td>test</td><td>world</td></tr></table> | Close td. | HTML |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
if index > 27
print('output') | if index > 27:
print('output') | Colon missing after if. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
let s1 = String::from("hello"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("hello"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
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