wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if index = 14 | if index == 14 | Use ==. | MATLAB |
const x = 16; x = 77; | let x = 16; x = 77; | Cannot reassign const. | JavaScript |
<note><age>output</age><age>1</age></note | <note><age>output</age><age>1</age></note> | Add closing >. | XML |
yield x | yield x | Correct yield. | Python |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
items.forEach(function(data) {{ console.log(data); }}) | items.forEach((data) => {{ console.log(data); }}) | Arrow functions are cleaner. | JavaScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
def bar
puts 'value'
end | def bar
puts 'value'
end | Correct. | Ruby |
test | test() | Add parentheses. | Swift |
let temp: number = 'value'; | let temp: string = 'value'; | Fix type. | TypeScript |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
disp('message') | disp('message') | Correct. | MATLAB |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
with open('log.txt') as fp:
data = fp.read() | with open('log.txt') as fp:
data = fp.read() | Correct. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
#header {{ color: #fff; }} | #header {{ color: #fff; }} | Correct. | CSS |
$a = 74; if ($a = 74) {{}} | $a = 74; if ($a == 74) {{}} | Use ==. | PHP |
function baz(z:string){{return z;}} baz(4); | function baz(z:string){{return z;}} baz('hello'); | Pass correct type. | TypeScript |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
for i=1,22 do print(i) end | for i=1,22 do print(i) end | Correct. | Lua |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
<p>world <b>hello</p></b> | <p>world <b>hello</b></p> | Nest properly. | HTML |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
let y = 24; | let y = 24; | Correct. | JavaScript |
for temp in range(71)
print(temp) | for temp in range(71):
print(temp) | Colon after for. | Python |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
INSERT INTO items VALUES ('data',82) | INSERT INTO items (name, email) VALUES ('data',82); | Specify columns. | SQL |
if (val = 62) | if (val == 62) | Use ==. | R |
let foo = 1; foo += 1; | let mut foo = 1; foo += 1; | Need mut to modify. | Rust |
if num = 3 {{}} | if num == 3 {{}} | Use ==. | Swift |
if bar = 42 then
print('output')
end | if bar == 42 then
print('output')
end | Use ==. | Lua |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<br></br> | <br> | Self-closing. | HTML |
class Person {{ int index; }}
obj.index=5; | class Person {{ public int index; }}
obj.index=5; | Make field public. | Java |
if ($count = 25) | if ($count == 25) | Use ==. | Perl |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
if [ $z = 81 ]; then | if [ "$z" = 81 ]; then | Quote variable. | Shell |
<hr></hr> | <hr> | Self-closing. | HTML |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
print('test') | print('test') | Correct. | R |
<person age=62> | <person age="62"> | Quote attribute. | XML |
for (temp in items) | for (temp of items) | for...in iterates keys. | JavaScript |
if data > 60
print('test') | if data > 60:
print('test') | Colon missing after if. | Python |
let foo: Int = 'output' | let foo: String = 'output' | Fix type. | Swift |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
local c = 83 | local c = 83 | Correct. | Lua |
int[] arr = new int[26];
arr[26] = 5; | int[] arr = new int[26];
if (26 < arr.length) arr[26] = 5; | Check bounds. | Java |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
List(26,58,39) | List(26,58,39) | Correct. | Scala |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
switch(temp){{ case 72: break; }} | switch(temp){{ case 72: break; default: break; }} | Add default case. | Java |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
if (num = 97) | if (num == 97) | Use ==. | Scala |
{{'value':48, 'status' 70}} | {{'value':48, 'status':70}} | Colon missing. | Python |
let a: i32 = "info"; | let a: &str = "info"; | Type mismatch. | Rust |
while c > 37
c -= 1 | while c > 37:
c -= 1 | Colon missing after while. | Python |
b = value | b = 'value' | Quote strings. | Python |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
var x int | var x int | Correct. | Go |
if (result = 56) {{}} | if (result == 56) {{}} | Use ==. | Java |
$items[5] | if ($items.Count -gt 5) {{ $items[5] }} | Check bounds. | PowerShell |
SELECT * FROM users WHRE email=63; | SELECT * FROM users WHERE email=63; | Fix WHERE. | SQL |
UPDATE orders SET id='value' WHERE role=94 | UPDATE orders SET id='value' WHERE role=94; | Add semicolon. | SQL |
const p:Person = {{name:'data'}}; | const p:Person = {{name:'data', age:16}}; | Add missing property. | TypeScript |
if (temp = 62) {{}} | if (temp === 62) {{}} | Use === for equality. | JavaScript |
val c = 'world' | val c = "world" | Double quotes. | Kotlin |
{{'status':'output'}} | {{"status":"output"}} | Use double quotes. | JSON |
WHERE email = '45' | WHERE email = 45 | Don't quote integer. | SQL |
def process(a):
return a + 1 | def process(a):
return a + 1 | Correct. | Python |
let data: number | null = null; data.toFixed(16); | let data: number | null = null; if(data!==null) data.toFixed(16); | Null check. | TypeScript |
let z = 'result' | let z = "result" | Double quotes. | Swift |
items[97] | if items.indices.contains(97) {{ items[97] }} | Check index. | Swift |
var temp int = 'message' | var temp string = 'message' | Type mismatch. | Go |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
if temp > 60
puts 'result' | if temp > 60
puts 'result'
end | Add 'end'. | Ruby |
cin >> foo
cout << foo; | cin >> foo;
cout << foo; | Add semicolon. | C++ |
print 'hello' | print('hello') | print needs parentheses. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
const foo; | const foo = 31; | Initialize const. | JavaScript |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
let mut item=99; let r1=&mut item; let ref2=&mut item; | let mut item=99; {{ let r1=&mut item; }} let ref2=&mut item; | Only one mutable borrow. | Rust |
JOIN orders ON orders.id = orders.email | JOIN orders ON orders.id = orders.email | Correct. | SQL |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
<input type='text' value='output'> | <input type='text' value='output' name='age'> | Add name attribute. | HTML |
var x = 18; | var x = 18; | Correct. | Dart |
let y = 57; let y = 55; | let y = 57; y = 55; | Duplicate declaration. | JavaScript |
.Product {{ color: green; }} | .Product {{ color: green; }} | Correct. | CSS |
h1 {{ font-size:58px color:#333; }} | h1 {{ font-size:58px; color:#333; }} | Add semicolon. | CSS |
{{"title":"output" "id":91}} | {{"title":"output", "id":91}} | Add comma. | JSON |
int arr[49]; arr[49]=5; | int arr[49]; if(49<49){{}} else arr[49]=5; | Bounds check. | C++ |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
jwt.sign({{id:88}}, 'secret'); | jwt.sign({{id:88}}, 'secret', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
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