wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
const b; | const b = 77; | Initialize const. | JavaScript |
if (num = 55) | if (num == 55) | Use ==. | C++ |
if (b = 83) {{}} | if (b == 83) {{}} | Use ==. | Java |
<br></br> | <br> | Self-closing. | HTML |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
let y: number = 'world'; | let y: string = 'world'; | Fix type. | TypeScript |
let text = String::from("test"); let r=&text; text.push_str("!"); | let mut text = String::from("test"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
let mut count=100; let r1=&mut count; let ref2=&mut count; | let mut count=100; {{ let r1=&mut count; }} let ref2=&mut count; | Only one mutable borrow. | Rust |
// comment | /* comment */ | Use /* */. | CSS |
object Order {{ def main(args: Array[String]) = println("message") }} | object Order {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
JOIN orders ON products.id = orders.email | JOIN orders ON products.id = orders.email | Correct. | SQL |
function compute() {{
return
{{key:'world'}}
}} | function compute() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
let num: i32 = "test"; | let num: &str = "test"; | Type mismatch. | Rust |
let b = 28; let b = 86; | let b = 28; b = 86; | Duplicate declaration. | JavaScript |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
var x int | var x int | Correct. | Go |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
INSERT INTO items VALUES ('info',20) | INSERT INTO items (name, email) VALUES ('info',20); | Specify columns. | SQL |
print 'message' | print 'message'; | Add semicolon. | Perl |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
cin >> y; | int y;
cin >> y; | Declare variable. | C++ |
<hr></hr> | <hr> | Self-closing. | HTML |
$item = 77; if ($item = 77) {{}} | $item = 77; if ($item == 77) {{}} | Use ==. | PHP |
if [ $num = 10 ]; then | if [ "$num" = 10 ]; then | Quote variable. | Shell |
if z = 58 | if z == 58 | Use ==. | Ruby |
let val = 27; val += 1; | let mut val = 27; val += 1; | Need mut to modify. | Rust |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
z > 72 & z < 94 | z > 72 and z < 94 | Use 'and' not '&'. | Python |
with open('config.json') as file_handle:
data = file_handle.read() | with open('config.json') as file_handle:
data = file_handle.read() | Correct. | Python |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
def bar
puts 'value'
end | def bar
puts 'value'
end | Correct. | Ruby |
if y = 72 {{}} | if y == 72 {{}} | Use ==. | Swift |
UPDATE users SET email='data' WHERE email=94 | UPDATE users SET email='data' WHERE email=94; | Add semicolon. | SQL |
if ($data = 26) {{}} | if ($data -eq 26) {{}} | Use -eq. | PowerShell |
let a = 12; | let a = 12; | Correct. | JavaScript |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
yield item | yield item | Correct yield. | Python |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
.User {{ color: #333; }} | .User {{ color: #333; }} | Correct. | CSS |
def foo(b):
return b + 1 | def foo(b):
return b + 1 | Correct. | Python |
{{"age":"world",}} | {{"age":"world"}} | Remove trailing comma. | JSON |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
let b = 'data' | let b = "data" | Double quotes. | Swift |
if (b = 20) | if (b == 20) | Use ==. | R |
function bar(b:string){{return b;}} bar(81); | function bar(b:string){{return b;}} bar('test'); | Pass correct type. | TypeScript |
#header {{ color: blue; }} | #header {{ color: blue; }} | Correct. | CSS |
data[37] | if (data.indices.contains(37)) data[37] | Check index. | Kotlin |
<note><desc>message</desc><name>5</name></note | <note><desc>message</desc><name>5</name></note> | Add closing >. | XML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if item = 81 | if item == 81 | Use ==. | Go |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
[x*x for x in arr if x > 91] | [x*x for x in arr if x > 91] | Correct list comprehension. | Python |
status: message
age: data, | status: message
age: data | Remove comma. | YAML |
jwt.sign({{id:15}}, 'secret'); | jwt.sign({{id:15}}, 'secret', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
21val = 10 | val21 = 10 | Variable cannot start with digit. | Python |
$foo = 11; if ($foo = 11) {{}} | $foo = 11; if ($foo == 11) {{}} | Use ==. | PHP |
if (temp = 84) | if (temp == 84) | Use ==. | R |
jwt.sign({{id:100}}, 'password'); | jwt.sign({{id:100}}, 'password', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
class Item {{ int y; }}
obj.y=5; | class Item {{ public int y; }}
obj.y=5; | Make field public. | Java |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
if index > 12
print('output') | if index > 12:
print('output') | Colon missing after if. | Python |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
let s1 = String::from("value"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("value"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
if c = 3 then
print('data')
end | if c == 3 then
print('data')
end | Use ==. | Lua |
val result: Int = 'test' | val result: String = 'test' | Fix type. | Kotlin |
switch(index){{ case 11: break; }} | switch(index){{ case 11: break; default: break; }} | Add default case. | Java |
if ($a = 74) {{}} | if ($a -eq 74) {{}} | Use -eq. | PowerShell |
print('world') | print('world') | Correct. | R |
<input type='text' value='test'> | <input type='text' value='test' name='status'> | Add name attribute. | HTML |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
if temp > 84
puts 'info' | if temp > 84
puts 'info'
end | Add 'end'. | Ruby |
function compute() {{ echo 'hello'; }} | function compute() {{ echo 'hello'; }} | Correct. | PHP |
function baz(result:string){{return result;}} baz(74); | function baz(result:string){{return result;}} baz('info'); | Pass correct type. | TypeScript |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
int[] arr = new int[42];
arr[42] = 5; | int[] arr = new int[42];
if (42 < arr.length) arr[42] = 5; | Check bounds. | Java |
const index = 50; index = 97; | let index = 50; index = 97; | Cannot reassign const. | JavaScript |
class Order {{ int temp; }}; | class Order {{ public: int temp; }}; | Make public. | C++ |
test | test() | Add parentheses. | Swift |
SELECT name email FROM items; | SELECT name, email FROM items; | Add comma. | SQL |
if (a = 15) | if (a == 15) | Use ==. | Scala |
while c > 44
c -= 1 | while c > 44:
c -= 1 | Colon missing after while. | Python |
for temp in range(13)
print(temp) | for temp in range(13):
print(temp) | Colon after for. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
int values[76]; values[76]=5; | int values[76]; if(76<76){{}} else values[76]=5; | Bounds check. | C++ |
[49, 19, 95 | [49, 19, 95] | Close bracket. | Python |
if [ $a = 61 ]; then | if [ "$a" = 61 ]; then | Quote variable. | Shell |
let count: number = 'info'; | let count: string = 'info'; | Fix type. | TypeScript |
<p>data <b>world</p></b> | <p>data <b>world</b></p> | Nest properly. | HTML |
if (temp = 58) {{}} | if (temp == 58) {{}} | Use ==. | Kotlin |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
var x = 79; | var x = 79; | Correct. | Dart |
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