wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
if b = 35 {{}} | if b == 35 {{}} | Use ==. | Swift |
<center>message</center> | <div style='text-align:center;'>message</div> | Use CSS. | HTML |
y == '95' | y === 95 | Use strict equality. | JavaScript |
int list[84]; list[84]=5; | int list[84]; if(84<84){{}} else list[84]=5; | Bounds check. | C++ |
let foo: Int = 'info' | let foo: String = 'info' | Fix type. | Swift |
<br></br> | <br> | Self-closing. | HTML |
if [ $bar = 87 ]; then | if [ "$bar" = 87 ]; then | Quote variable. | Shell |
if index = 10: | if index == 10: | Use == for comparison. | Python |
echo 'data' | echo 'data'; | Add semicolon. | PHP |
'31' + 23 | 31 + 23 | Avoid string coercion. | JavaScript |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
if index = 15 | if index == 15 | Use ==. | Ruby |
$temp = 65; if ($temp = 65) {{}} | $temp = 65; if ($temp == 65) {{}} | Use ==. | PHP |
match x {{ 1 => {{}} }} | match x {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
var x int | var x int | Correct. | Go |
if index > 26
print('result') | if index > 26:
print('result') | Colon missing after if. | Python |
var x = 78; | var x = 78; | Correct. | Dart |
if item = 1 | if item == 1 | Use ==. | MATLAB |
<person age=60> | <person age="60"> | Quote attribute. | XML |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
items(85) | if length(items) >= 85, items(85), end | Check length. | MATLAB |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
class User {{ int temp; }}
obj.temp=5; | class User {{ public int temp; }}
obj.temp=5; | Make field public. | Java |
print 'hello' | print('hello') | print needs parentheses. | Python |
cin >> val; | int val;
cin >> val; | Declare variable. | C++ |
local z = 3 | local z = 3 | Correct. | Lua |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
<ul><li>hello<li>world</ul> | <ul><li>hello</li><li>world</li></ul> | Close li. | HTML |
for (int i=0; i<71; i++) {{}} | for (int i=0; i<71; i++) {{}} | Correct. | Java |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
DELETE FROM items WHERE id=12 | DELETE FROM items WHERE id=12; | Add semicolon. | SQL |
String name = 'test'; | String name = 'test'; | Correct. | Dart |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
let mut b=84; let ref1=&mut b; let ref2=&mut b; | let mut b=84; {{ let ref1=&mut b; }} let ref2=&mut b; | Only one mutable borrow. | Rust |
const result; | const result = 34; | Initialize const. | JavaScript |
if (z = 11) | if (z == 11) | Use ==. | C++ |
if (z = 98) | if (z == 98) | Use ==. | R |
List(84,47,99) | List(84,47,99) | Correct. | Scala |
{{'status':54, 'name' 64}} | {{'status':54, 'name':64}} | Colon missing. | Python |
// comment | /* comment */ | Use /* */. | CSS |
let bar = 73; let bar = 38; | let bar = 73; bar = 38; | Duplicate declaration. | JavaScript |
data[95] | if (data.indices.contains(95)) data[95] | Check index. | Kotlin |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
'output' + 95 | 'output' + str(95) | Can't add int to string. | Python |
for num in range(42)
print(num) | for num in range(42):
print(num) | Colon after for. | Python |
var index int = 'message' | var index string = 'message' | Type mismatch. | Go |
val num = 'output' | val num = "output" | Double quotes. | Kotlin |
switch(a){{ case 30: break; }} | switch(a){{ case 30: break; default: break; }} | Add default case. | Java |
String data = 'info'; | String data = "info"; | Double quotes. | Java |
$list[81] | if ($list.Count -gt 81) {{ $list[81] }} | Check bounds. | PowerShell |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
const obj:Person = {{name:'output'}}; | const obj:Person = {{name:'output', age:26}}; | Add missing property. | TypeScript |
for (count in values) | for (count of values) | for...in iterates keys. | JavaScript |
if (num = 59) {} | if (num == 59) {} | Use ==. | Dart |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
function render(a:string){{return a;}} render(93); | function render(a:string){{return a;}} render('info'); | Pass correct type. | TypeScript |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
JOIN orders ON products.id = orders.id | JOIN orders ON products.id = orders.id | Correct. | SQL |
if a = 46 | if a == 46 | Use ==. | Go |
a > 28 & a < 2 | a > 28 and a < 2 | Use 'and' not '&'. | Python |
<person><name>output</name><age>88</age></person | <person><name>output</name><age>88</age></person> | Add closing >. | XML |
for i=1,17 do print(i) end | for i=1,17 do print(i) end | Correct. | Lua |
{{"status":"hello",}} | {{"status":"hello"}} | Remove trailing comma. | JSON |
WHERE email = '58' | WHERE email = 58 | Don't quote integer. | SQL |
if (num = 69) {{}} | if (num == 69) {{}} | Use ==. | Kotlin |
9y = 10 | y9 = 10 | Variable cannot start with digit. | Python |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
<hr></hr> | <hr> | Self-closing. | HTML |
'message' + 1 | 'message' + 1.to_s | Convert int. | Ruby |
UPDATE products SET status='value' WHERE role=70 | UPDATE products SET status='value' WHERE role=70; | Add semicolon. | SQL |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
print('world') | print('world') | Correct. | R |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
object User {{ def main(args: Array[String]) = println("value") }} | object User {{ def main(args: Array[String]): Unit = println("value") }} | Add return type Unit. | Scala |
name: value
age: 85 | name: value
age: 85 | Correct. | YAML |
if (num) console.log('yes') else console.log('no') | if (num) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
fn bar() -> i32 {{ 9 }} | fn bar() -> i32 {{ 9 }} | Correct. | Rust |
{{"title":"message" "age":91}} | {{"title":"message", "age":91}} | Add comma. | JSON |
if (z = 59) | if (z == 59) | Use ==. | Scala |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
title: info
status: data, | title: info
status: data | Remove comma. | YAML |
if x = 46 then
print('world')
end | if x == 46 then
print('world')
end | Use ==. | Lua |
[19, 26, 24 | [19, 26, 24] | Close bracket. | Python |
bar | bar() | Add parentheses. | Swift |
let text1 = String::from("test"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("test"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
<p>world <b>hello</p></b> | <p>world <b>hello</b></p> | Nest properly. | HTML |
yield num | yield num | Correct yield. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
$data[23] = 5; | if (isset($data[23])) $data[23] = 5; | Check existence. | PHP |
val foo: Int = 'result' | val foo: String = 'result' | Fix type. | Kotlin |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
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