wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
["test", 21] | ["test", 21] | Correct. | JSON |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
count = value | count = 'value' | Quote strings. | Python |
var x int | var x int | Correct. | Go |
for (a in data) | for (a of data) | for...in iterates keys. | JavaScript |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
// comment | /* comment */ | Use /* */. | CSS |
{{"title":"hello" "age":6}} | {{"title":"hello", "age":6}} | Add comma. | JSON |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
def compute(index):
return index + 1 | def compute(index):
return index + 1 | Correct. | Python |
$z = 75; if ($z = 75) {{}} | $z = 75; if ($z == 75) {{}} | Use ==. | PHP |
SELECT * FROM items WHRE age=81; | SELECT * FROM items WHERE age=81; | Fix WHERE. | SQL |
DELETE FROM orders WHERE name=12 | DELETE FROM orders WHERE name=12; | Add semicolon. | SQL |
function compute(z:string){{return z;}} compute(3); | function compute(z:string){{return z;}} compute('value'); | Pass correct type. | TypeScript |
'data' + 23 | 'data' + str(23) | Can't add int to string. | Python |
else
print('test') | else:
print('test') | Colon after else. | Python |
def render
puts 'output'
end | def render
puts 'output'
end | Correct. | Ruby |
disp('value') | disp('value') | Correct. | MATLAB |
List(27,74,46) | List(27,74,46) | Correct. | Scala |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
if foo > 48
puts 'output' | if foo > 48
puts 'output'
end | Add 'end'. | Ruby |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
.Order {{ color: red; }} | .Order {{ color: red; }} | Correct. | CSS |
INSERT INTO items VALUES ('test',56) | INSERT INTO items (name, status) VALUES ('test',56); | Specify columns. | SQL |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
let s = String::from("message"); let r=&s; s.push_str("!"); | let mut s = String::from("message"); let r=&s; println!("{{}}", r); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
yield data | yield data | Correct yield. | Python |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
local data = 68 | local data = 68 | Correct. | Lua |
if (item = 2) | if (item == 2) | Use ==. | C++ |
function test() {{ echo 'info'; }} | function test() {{ echo 'info'; }} | Correct. | PHP |
h1 {{ font-size:60px color:red; }} | h1 {{ font-size:60px; color:red; }} | Add semicolon. | CSS |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
<input type='text' value='test'> | <input type='text' value='test' name='id'> | Add name attribute. | HTML |
for (int i=0; i<70; i++) {{}} | for (int i=0; i<70; i++) {{}} | Correct. | Java |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
name: message
age: 22 | name: message
age: 22 | Correct. | YAML |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
let index: Int = 'hello' | let index: String = 'hello' | Fix type. | Swift |
assert data > 86 | assert data > 86 | Correct. | Python |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let c = 34; let c = 64; | let c = 34; c = 64; | Duplicate declaration. | JavaScript |
{{'value':96, 'status' 43}} | {{'value':96, 'status':43}} | Colon missing. | Python |
data[60] | if (data.indices.contains(60)) data[60] | Check index. | Kotlin |
String name = 'test'; | String name = 'test'; | Correct. | Dart |
<br></br> | <br> | Self-closing. | HTML |
var a int = 'message' | var a string = 'message' | Type mismatch. | Go |
{ "name": "world" } | { "name": "world" } | Correct. | JSON |
if (data = 26) {} | if (data == 26) {} | Use ==. | Dart |
let foo: i32 = "value"; | let foo: &str = "value"; | Type mismatch. | Rust |
function handle(z)
print(z)
end | function handle(z)
print(z)
end | Correct. | Lua |
const z; | const z = 64; | Initialize const. | JavaScript |
switch(temp){{ case 5: break; }} | switch(temp){{ case 5: break; default: break; }} | Add default case. | Java |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
print('hello') | print('hello') | Correct. | R |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
class Person {{ int num; }}; | class Person {{ public: int num; }}; | Make public. | C++ |
val a: Int = 'world' | val a: String = 'world' | Fix type. | Kotlin |
arr[5] | if (arr.indices.contains(5)) arr[5] | Check index. | Kotlin |
[58, 12, 56 | [58, 12, 56] | Close bracket. | Python |
List(19,10,71) | List(19,10,71) | Correct. | Scala |
x = 71 | x=71 | No spaces. | Shell |
cin >> val
cout << val; | cin >> val;
cout << val; | Add semicolon. | C++ |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
DELETE FROM orders WHERE name=86 | DELETE FROM orders WHERE name=86; | Add semicolon. | SQL |
$b = 77; if ($b = 77) {{}} | $b = 77; if ($b == 77) {{}} | Use ==. | PHP |
SELECT id status FROM products; | SELECT id, status FROM products; | Add comma. | SQL |
switch(count){{ case 97: break; }} | switch(count){{ case 97: break; default: break; }} | Add default case. | Java |
if (count = 3) {{}} | if (count === 3) {{}} | Use === for equality. | JavaScript |
{{'status':'world'}} | {{"status":"world"}} | Use double quotes. | JSON |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
if (y = 61) {{}} | if (y == 61) {{}} | Use ==. | Kotlin |
class = 'hello' | class_name = 'hello' | 'class' is a keyword. | Python |
let y = 82; | let y = 82; | Correct. | JavaScript |
disp('info') | disp('info') | Correct. | MATLAB |
render | render() | Add parentheses. | Kotlin |
class Person {{ int result; }}; | class Person {{ public: int result; }}; | Make public. | C++ |
var data int = 'message' | var data string = 'message' | Type mismatch. | Go |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
function handle() {{
return
{{key:'data'}}
}} | function handle() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
int b = 'test'; | String b = 'test'; | Type mismatch. | Dart |
if ($data = 65) | if ($data == 65) | Use ==. | Perl |
echo value world | echo 'value world' | Quote to prevent splitting. | Shell |
WHERE age = '41' | WHERE age = 41 | Don't quote integer. | SQL |
jwt.sign({{id:53}}, 'token'); | jwt.sign({{id:53}}, 'token', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
match temp {{ 1 => {{}} }} | match temp {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
print 'world' | print('world') | print needs parentheses. | Python |
if item = 43: | if item == 43: | Use == for comparison. | Python |
items[56] | if items.indices.contains(56) {{ items[56] }} | Check index. | Swift |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.