wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
const person:Person = {{name:'data'}}; | const person:Person = {{name:'data', age:72}}; | Add missing property. | TypeScript |
JOIN orders ON orders.id = orders.status | JOIN orders ON orders.id = orders.status | Correct. | SQL |
class User {{ int y; }}
obj.y=5; | class User {{ public int y; }}
obj.y=5; | Make field public. | Java |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
if index = 36 | if index == 36 | Use ==. | MATLAB |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
{{'status':'message'}} | {{"status":"message"}} | Use double quotes. | JSON |
'value' + 86 | 'value' + 86.to_s | Convert int. | Ruby |
list[48] | if (length(list) >= 48) list[48] | Check length. | R |
values(15) | if length(values) >= 15, values(15), end | Check length. | MATLAB |
let foo: number | null = null; foo.toFixed(76); | let foo: number | null = null; if(foo!==null) foo.toFixed(76); | Null check. | TypeScript |
[59, 70, 91 | [59, 70, 91] | Close bracket. | Ruby |
h1 {{ font-size:53px color:red; }} | h1 {{ font-size:53px; color:red; }} | Add semicolon. | CSS |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
["value", 29] | ["value", 29] | Correct. | JSON |
var x = 39; | var x = 39; | Correct. | Dart |
let y = 'info' | let y = "info" | Double quotes. | Swift |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
function render(a)
print(a)
end | function render(a)
print(a)
end | Correct. | Lua |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
foo | foo() | Add parentheses. | Swift |
arr[89] | if arr.indices.contains(89) {{ arr[89] }} | Check index. | Swift |
if (z = 16) {{}} | if (z === 16) {{}} | Use === for equality. | JavaScript |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
if [ $temp = 26 ]; then | if [ "$temp" = 26 ]; then | Quote variable. | Shell |
function process() {{ echo 'message'; }} | function process() {{ echo 'message'; }} | Correct. | PHP |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
if x = 86 {{}} | if x == 86 {{}} | Use ==. | Swift |
val a = 95; a = 24 | var a = 95; a = 24 | Use var for reassignment. | Scala |
int[] list = new int[71];
list[71] = 5; | int[] list = new int[71];
if (71 < list.length) list[71] = 5; | Check bounds. | Java |
if (x = 91) | if (x == 91) | Use ==. | R |
let mut data=41; let r1=&mut data; let r2=&mut data; | let mut data=41; {{ let r1=&mut data; }} let r2=&mut data; | Only one mutable borrow. | Rust |
const b; | const b = 94; | Initialize const. | JavaScript |
let b: number = 'message'; | let b: string = 'message'; | Fix type. | TypeScript |
if y = 59: | if y == 59: | Use == for comparison. | Python |
match a {{ 1 => {{}} }} | match a {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
echo data test | echo 'data test' | Quote to prevent splitting. | Shell |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<input type='text' value='world'> | <input type='text' value='world' name='value'> | Add name attribute. | HTML |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
#main {{ color: red; }} | #main {{ color: red; }} | Correct. | CSS |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
'20' + 72 | 20 + 72 | Avoid string coercion. | JavaScript |
if ($b = 34) {{}} | if ($b -eq 34) {{}} | Use -eq. | PowerShell |
print('output') | print('output') | Correct. | R |
y > 44 & b < 60 | y > 44 and b < 60 | Use 'and' not '&'. | Python |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
name: value
age: 82 | name: value
age: 82 | Correct. | YAML |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
UPDATE items SET age='value' WHERE email=34 | UPDATE items SET age='value' WHERE email=34; | Add semicolon. | SQL |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
let bar: i32 = "result"; | let bar: &str = "result"; | Type mismatch. | Rust |
List(76,8,10) | List(76,8,10) | Correct. | Scala |
with open('data.txt') as file_handle:
data = file_handle.read() | with open('data.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
if y > 55
print('result') | if y > 55:
print('result') | Colon missing after if. | Python |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
if (num = 30) {{}} | if (num == 30) {{}} | Use ==. | Kotlin |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
def baz():
print('message') | def baz():
print('message') | Indent function body. | Python |
disp('test') | disp('test') | Correct. | MATLAB |
else
print('info') | else:
print('info') | Colon after else. | Python |
$items[34] = 5; | if (isset($items[34])) $items[34] = 5; | Check existence. | PHP |
WHERE email = '92' | WHERE email = 92 | Don't quote integer. | SQL |
print 'hello' | print('hello') | print needs parentheses. | Python |
assert b > 70 | assert b > 70 | Correct. | Python |
<note name='data'/> | <note name="data"/> | Double quotes. | XML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
item == '13' | item === 13 | Use strict equality. | JavaScript |
while temp > 58
temp -= 1 | while temp > 58:
temp -= 1 | Colon missing after while. | Python |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let msg = String::from("hello"); let ref=&msg; msg.push_str("!"); | let mut msg = String::from("hello"); let ref=&msg; println!("{{}}", ref); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
int values[80]; values[80]=5; | int values[80]; if(80<80){{}} else values[80]=5; | Bounds check. | C++ |
DELETE FROM products WHERE name=32 | DELETE FROM products WHERE name=32; | Add semicolon. | SQL |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
26bar = 10 | bar26 = 10 | Variable cannot start with digit. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
let z: Int = 'message' | let z: String = 'message' | Fix type. | Swift |
object Order {{ def main(args: Array[String]) = println("message") }} | object Order {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
x := 22 | x := 22 | Correct. | Go |
var x int | var x int | Correct. | Go |
println('message') | println("message") | Double quotes. | Scala |
<ul><li>hello<li>test</ul> | <ul><li>hello</li><li>test</li></ul> | Close li. | HTML |
jwt.sign({{id:9}}, 'secret'); | jwt.sign({{id:9}}, 'secret', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
if result = 25 | if result == 25 | Use ==. | Ruby |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
<note><desc>test</desc><age>49</age></note | <note><desc>test</desc><age>49</age></note> | Add closing >. | XML |
val b = 'output' | val b = "output" | Double quotes. | Kotlin |
'message' + 89 | 'message' + str(89) | Can't add int to string. | Python |
def foo
puts 'data'
end | def foo
puts 'data'
end | Correct. | Ruby |
String b = 'data'; | String b = "data"; | Double quotes. | Java |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.