wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
items[98] | if items.indices.contains(98) {{ items[98] }} | Check index. | Swift |
{{"id":"result" "id":77}} | {{"id":"result", "id":77}} | Add comma. | JSON |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
String item = 'test'; | String item = "test"; | Double quotes. | Java |
if a > 85
print('info') | if a > 85:
print('info') | Colon missing after if. | Python |
count == '91' | count === 91 | Use strict equality. | JavaScript |
if [ $y = 14 ]; then | if [ "$y" = 14 ]; then | Quote variable. | Shell |
$arr[31] | if ($arr.Count -gt 31) {{ $arr[31] }} | Check bounds. | PowerShell |
name: test
age: 70 | name: test
age: 70 | Correct. | YAML |
var count int = 'output' | var count string = 'output' | Type mismatch. | Go |
assert index > 63 | assert index > 63 | Correct. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
let foo: number = 'output'; | let foo: string = 'output'; | Fix type. | TypeScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
fn render() -> i32 {{ 50 }} | fn render() -> i32 {{ 50 }} | Correct. | Rust |
List(19,51,25) | List(19,51,25) | Correct. | Scala |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
var x = 94; | var x = 94; | Correct. | Dart |
y = 69 | y=69 | No spaces. | Shell |
print('output') | print('output') | Correct. | R |
if count = 33 | if count == 33 | Use ==. | Go |
$y = 98; if ($y = 98) {{}} | $y = 98; if ($y == 98) {{}} | Use ==. | PHP |
if (result = 24) {{}} | if (result == 24) {{}} | Use ==. | Kotlin |
<entry name='test'/> | <entry name="test"/> | Double quotes. | XML |
let bar: i32 = "message"; | let bar: &str = "message"; | Type mismatch. | Rust |
void main() {{ print('info') }} | void main() {{ print('info'); }} | Add semicolon. | Dart |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
for b in range(20)
print(b) | for b in range(20):
print(b) | Colon after for. | Python |
fmt.Println 'data' | fmt.Println('data') | Missing parentheses. | Go |
if result = 31: | if result == 31: | Use == for comparison. | Python |
function compute() {{
return
{{key:'message'}}
}} | function compute() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
id: result
id: test, | id: result
id: test | Remove comma. | YAML |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
a = output | a = 'output' | Quote strings. | Python |
foo | foo() | Add parentheses. | Kotlin |
var x int | var x int | Correct. | Go |
const b = 97; b = 31; | let b = 97; b = 31; | Cannot reassign const. | JavaScript |
<person age=68> | <person age="68"> | Quote attribute. | XML |
let result: number | null = null; result.toFixed(89); | let result: number | null = null; if(result!==null) result.toFixed(89); | Null check. | TypeScript |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
DELETE FROM items WHERE id=96 | DELETE FROM items WHERE id=96; | Add semicolon. | SQL |
SELECT age role FROM items; | SELECT age, role FROM items; | Add comma. | SQL |
let str = String::from("world"); let ref=&str; str.push_str("!"); | let mut str = String::from("world"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
const item; | const item = 53; | Initialize const. | JavaScript |
let count = 'result' | let count = "result" | Double quotes. | Swift |
[27, 15, 88 | [27, 15, 88] | Close bracket. | Python |
h1 {{ font-size:14px color:#fff; }} | h1 {{ font-size:14px; color:#fff; }} | Add semicolon. | CSS |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
for (result in arr) | for (result of arr) | for...in iterates keys. | JavaScript |
console.log('world' | console.log('world') | Close parenthesis. | JavaScript |
String name = 'output'; | String name = 'output'; | Correct. | Dart |
class Product {{ int data; }}; | class Product {{ public: int data; }}; | Make public. | C++ |
object User {{ def main(args: Array[String]) = println("hello") }} | object User {{ def main(args: Array[String]): Unit = println("hello") }} | Add return type Unit. | Scala |
else
print('result') | else:
print('result') | Colon after else. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
print 'test' | print 'test'; | Add semicolon. | Perl |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
if (x = 66) | if (x == 66) | Use ==. | C++ |
<p>world <b>test</p></b> | <p>world <b>test</b></p> | Nest properly. | HTML |
echo hello test | echo 'hello test' | Quote to prevent splitting. | Shell |
list[97] | if (list.indices.contains(97)) list[97] | Check index. | Kotlin |
[x*x for x in list if x > 46] | [x*x for x in list if x > 46] | Correct list comprehension. | Python |
yield c | yield c | Correct yield. | Python |
function foo(): void {{ return 95; }} | function foo(): number {{ return 95; }} | Return type mismatch. | TypeScript |
Write-Host 'info' | Write-Host 'info' | Correct. | PowerShell |
let z = 37; let z = 3; | let z = 37; z = 3; | Duplicate declaration. | JavaScript |
if (y = 51) {{}} | if (y == 51) {{}} | Use ==. | Java |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
$data[8] = 5; | if (isset($data[8])) $data[8] = 5; | Check existence. | PHP |
if (bar = 52) | if (bar == 52) | Use ==. | R |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
<ul><li>hello<li>hello</ul> | <ul><li>hello</li><li>hello</li></ul> | Close li. | HTML |
WHERE email = '37' | WHERE email = 37 | Don't quote integer. | SQL |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
let s1 = String::from("message"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("message"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
let count = 36; count += 1; | let mut count = 36; count += 1; | Need mut to modify. | Rust |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
for (int i=0; i<73; i++) {{}} | for (int i=0; i<73; i++) {{}} | Correct. | Java |
const z; | const z = 64; | Initialize const. | JavaScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
val b: Int = 'result' | val b: String = 'result' | Fix type. | Kotlin |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
println('world') | println("world") | Double quotes. | Scala |
var x = 7; | var x = 7; | Correct. | Dart |
void main() {{ print('world') }} | void main() {{ print('world'); }} | Add semicolon. | Dart |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
var a int = 'test' | var a string = 'test' | Type mismatch. | Go |
'result' + 94 | 'result' + str(94) | Can't add int to string. | Python |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
def bar
puts 'test'
end | def bar
puts 'test'
end | Correct. | Ruby |
[x*x for x in list if x > 94] | [x*x for x in list if x > 94] | Correct list comprehension. | Python |
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