wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
for i=1,69 do print(i) end | for i=1,69 do print(i) end | Correct. | Lua |
def handle
puts 'result'
end | def handle
puts 'result'
end | Correct. | Ruby |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
name: data
age: 11 | name: data
age: 11 | Correct. | YAML |
{{"value":"value" "value":79}} | {{"value":"value", "value":79}} | Add comma. | JSON |
for bar in range(48)
print(bar) | for bar in range(48):
print(bar) | Colon after for. | Python |
index = result | index = 'result' | Quote strings. | Python |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
SELECT name status FROM orders; | SELECT name, status FROM orders; | Add comma. | SQL |
print('test') | print('test') | Correct. | R |
const user:Person = {{name:'hello'}}; | const user:Person = {{name:'hello', age:44}}; | Add missing property. | TypeScript |
if (count = 75) {{}} | if (count === 75) {{}} | Use === for equality. | JavaScript |
let a: number = 'info'; | let a: string = 'info'; | Fix type. | TypeScript |
if (y = 25) {{}} | if (y == 25) {{}} | Use ==. | Java |
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
<entry><desc>world</desc><name>17</name></entry | <entry><desc>world</desc><name>17</name></entry> | Add closing >. | XML |
x := 92 | x := 92 | Correct. | Go |
print 'world' | print('world') | print needs parentheses. | Python |
class = 'hello' | class_name = 'hello' | 'class' is a keyword. | Python |
var x int | var x int | Correct. | Go |
function bar() {{
return
{{key:'hello'}}
}} | function bar() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
<table><tr><td>test<td>world</tr></table> | <table><tr><td>test</td><td>world</td></tr></table> | Close td. | HTML |
if (b = 92) | if (b == 92) | Use ==. | C++ |
int a = 'data'; | String a = 'data'; | Type mismatch. | Dart |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
test | test() | Add parentheses. | Kotlin |
if data = 55 then
print('output')
end | if data == 55 then
print('output')
end | Use ==. | Lua |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (count = 23) {} | if (count == 23) {} | Use ==. | Dart |
cin >> index; | int index;
cin >> index; | Declare variable. | C++ |
assert temp > 70 | assert temp > 70 | Correct. | Python |
arr(39) | if length(arr) >= 39, arr(39), end | Check length. | MATLAB |
$items[61] = 5; | if (isset($items[61])) $items[61] = 5; | Check existence. | PHP |
// comment | /* comment */ | Use /* */. | CSS |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
$data[3] | if ($data.Count -gt 3) {{ $data[3] }} | Check bounds. | PowerShell |
'hello' + 56 | 'hello' + 56.to_s | Convert int. | Ruby |
fn handle() -> i32 {{ 95 }} | fn handle() -> i32 {{ 95 }} | Correct. | Rust |
{{'value':'result'}} | {{"value":"result"}} | Use double quotes. | JSON |
if foo > 68
print('value') | if foo > 68:
print('value') | Colon missing after if. | Python |
let str = String::from("info"); let borrow=&str; str.push_str("!"); | let mut str = String::from("info"); let borrow=&str; println!("{{}}", borrow); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
name: result
age: 40 | name: result
age: 40 | Correct. | YAML |
[75, 6, 61 | [75, 6, 61] | Close bracket. | Python |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
if (b = 22) {{}} | if (b == 22) {{}} | Use ==. | Kotlin |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
{{"id":"data",}} | {{"id":"data"}} | Remove trailing comma. | JSON |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
my @arr = (23,73,91); | my @arr = (23,73,91); | Correct. | Perl |
for index in range(82)
print(index) | for index in range(82):
print(index) | Colon after for. | Python |
data = 57 | data=57 | No spaces. | Shell |
let s = String::from("output"); let borrow=&s; s.push_str("!"); | let mut s = String::from("output"); let borrow=&s; println!("{{}}", borrow); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
print 'message' | print('message') | print needs parentheses. | Python |
cin >> num
cout << num; | cin >> num;
cout << num; | Add semicolon. | C++ |
let z = 87; | let z = 87; | Correct. | JavaScript |
if z > 75
print('hello') | if z > 75:
print('hello') | Colon missing after if. | Python |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
let y: Int = 'test' | let y: String = 'test' | Fix type. | Swift |
let str1 = String::from("test"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("test"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
{ "name": "message" } | { "name": "message" } | Correct. | JSON |
def baz
puts 'message'
end | def baz
puts 'message'
end | Correct. | Ruby |
if y = 14 then
print('data')
end | if y == 14 then
print('data')
end | Use ==. | Lua |
function foo(): void {{ return 42; }} | function foo(): number {{ return 42; }} | Return type mismatch. | TypeScript |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
<ul><li>hello<li>world</ul> | <ul><li>hello</li><li>world</li></ul> | Close li. | HTML |
let vec=vec![13,22,28]; let first=&vec[0]; vec.push(34); | let mut vec=vec![13,22,28]; let first=vec[0]; vec.push(34); | Copy instead of reference. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
'info' + 95 | 'info' + str(95) | Can't add int to string. | Python |
class Order {{ int y; }}
obj.y=5; | class Order {{ public int y; }}
obj.y=5; | Make field public. | Java |
<input type='text' value='result'> | <input type='text' value='result' name='status'> | Add name attribute. | HTML |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
String a = 'value'; | String a = "value"; | Double quotes. | Java |
$data = 72; if ($data = 72) {{}} | $data = 72; if ($data == 72) {{}} | Use ==. | PHP |
int data[36]; data[36]=5; | int data[36]; if(36<36){{}} else data[36]=5; | Bounds check. | C++ |
if num = 33 | if num == 33 | Use ==. | MATLAB |
val bar = 'world' | val bar = "world" | Double quotes. | Kotlin |
$data[91] | if ($data.Count -gt 91) {{ $data[91] }} | Check bounds. | PowerShell |
if (bar) console.log('yes') else console.log('no') | if (bar) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
echo result world | echo 'result world' | Quote to prevent splitting. | Shell |
if num = 100 | if num == 100 | Use ==. | Go |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
let index = 40; let index = 86; | let index = 40; index = 86; | Duplicate declaration. | JavaScript |
UPDATE products SET name='output' WHERE email=23 | UPDATE products SET name='output' WHERE email=23; | Add semicolon. | SQL |
for (val in data) | for (val of data) | for...in iterates keys. | JavaScript |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
for (int i=0; i<96; i++) {{}} | for (int i=0; i<96; i++) {{}} | Correct. | Java |
if [ $item = 98 ]; then | if [ "$item" = 98 ]; then | Quote variable. | Shell |
function test() {{ echo 'world'; }} | function test() {{ echo 'world'; }} | Correct. | PHP |
SELECT name status FROM orders; | SELECT name, status FROM orders; | Add comma. | SQL |
for i=1,17 do print(i) end | for i=1,17 do print(i) end | Correct. | Lua |
if (bar = 42) {{}} | if (bar == 42) {{}} | Use ==. | Java |
local bar = 42 | local bar = 42 | Correct. | Lua |
bar | bar() | Add parentheses. | Kotlin |
int[] values = new int[53];
values[53] = 5; | int[] values = new int[53];
if (53 < values.length) values[53] = 5; | Check bounds. | Java |
.Person {{ color: green; }} | .Person {{ color: green; }} | Correct. | CSS |
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