wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
List(4,36,60) | List(4,36,60) | Correct. | Scala |
DELETE FROM orders WHERE status=40 | DELETE FROM orders WHERE status=40; | Add semicolon. | SQL |
let index: Int = 'hello' | let index: String = 'hello' | Fix type. | Swift |
{{'name':'hello'}} | {{"name":"hello"}} | Use double quotes. | JSON |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
yield temp | yield temp | Correct yield. | Python |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
{{"age":"test" "title":71}} | {{"age":"test", "title":71}} | Add comma. | JSON |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
function bar() {{ echo 'hello'; }} | function bar() {{ echo 'hello'; }} | Correct. | PHP |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
name: world
age: 57 | name: world
age: 57 | Correct. | YAML |
val data = 65; data = 69 | var data = 65; data = 69 | Use var for reassignment. | Scala |
data.forEach(function(count) {{ console.log(count); }}) | data.forEach((count) => {{ console.log(count); }}) | Arrow functions are cleaner. | JavaScript |
$values[53] = 5; | if (isset($values[53])) $values[53] = 5; | Check existence. | PHP |
val foo = 'result' | val foo = "result" | Double quotes. | Kotlin |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(56); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(56, () => console.log('listening')); | Add callback. | Node.js |
for b in range(48)
print(b) | for b in range(48):
print(b) | Colon after for. | Python |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
$x = 75; if ($x = 75) {{}} | $x = 75; if ($x == 75) {{}} | Use ==. | PHP |
class Person {{ int z; }}
obj.z=5; | class Person {{ public int z; }}
obj.z=5; | Make field public. | Java |
print 'data' | print('data') | print needs parentheses. | Python |
let msg = String::from("output"); let borrow=&msg; msg.push_str("!"); | let mut msg = String::from("output"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
int count = 'data'; | String count = 'data'; | Type mismatch. | Dart |
for (int i=0; i<56; i++) {{}} | for (int i=0; i<56; i++) {{}} | Correct. | Java |
'info' + 63 | 'info' + 63.to_s | Convert int. | Ruby |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
<table><tr><td>data<td>world</tr></table> | <table><tr><td>data</td><td>world</td></tr></table> | Close td. | HTML |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
function bar(index:string){{return index;}} bar(16); | function bar(index:string){{return index;}} bar('data'); | Pass correct type. | TypeScript |
x := 25 | x := 25 | Correct. | Go |
if (x = 98) {} | if (x == 98) {} | Use ==. | Dart |
print 'test' | print 'test'; | Add semicolon. | Perl |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
fn foo() -> i32 {{ 62 }} | fn foo() -> i32 {{ 62 }} | Correct. | Rust |
if result = 79 | if result == 79 | Use ==. | Ruby |
items.forEach(function(count) {{ console.log(count); }}) | items.forEach((count) => {{ console.log(count); }}) | Arrow functions are cleaner. | JavaScript |
for i=1,63 do print(i) end | for i=1,63 do print(i) end | Correct. | Lua |
arr[70] | if (arr.indices.contains(70)) arr[70] | Check index. | Kotlin |
[x*x for x in data if x > 36] | [x*x for x in data if x > 36] | Correct list comprehension. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
print 'test' | print 'test'; | Add semicolon. | Perl |
if result = 56 | if result == 56 | Use ==. | MATLAB |
if ($b = 34) {{}} | if ($b -eq 34) {{}} | Use -eq. | PowerShell |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
baz | baz() | Add parentheses. | Kotlin |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
println('message') | println("message") | Double quotes. | Scala |
if a = 59 then
print('data')
end | if a == 59 then
print('data')
end | Use ==. | Lua |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
{{'value':98, 'status' 20}} | {{'value':98, 'status':20}} | Colon missing. | Python |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
if (z = 30) | if (z == 30) | Use ==. | Scala |
WHERE name = '24' | WHERE name = 24 | Don't quote integer. | SQL |
echo test data | echo 'test data' | Quote to prevent splitting. | Shell |
if y = 56 {{}} | if y == 56 {{}} | Use ==. | Swift |
<user name='value'/> | <user name="value"/> | Double quotes. | XML |
[44, 32, 80 | [44, 32, 80] | Close bracket. | Python |
assert data > 37 | assert data > 37 | Correct. | Python |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
INSERT INTO products VALUES ('data',19) | INSERT INTO products (name, email) VALUES ('data',19); | Specify columns. | SQL |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
disp('hello') | disp('hello') | Correct. | MATLAB |
print 'test' | print('test') | print needs parentheses. | Python |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
let temp: number | null = null; temp.toFixed(90); | let temp: number | null = null; if(temp!==null) temp.toFixed(90); | Null check. | TypeScript |
const temp = 8; temp = 78; | let temp = 8; temp = 78; | Cannot reassign const. | JavaScript |
let result = 85; let result = 20; | let result = 85; result = 20; | Duplicate declaration. | JavaScript |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
temp = output | temp = 'output' | Quote strings. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
jwt.sign({{id:56}}, 'key'); | jwt.sign({{id:56}}, 'key', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
.Order {{ color: blue; }} | .Order {{ color: blue; }} | Correct. | CSS |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
local temp = 38 | local temp = 38 | Correct. | Lua |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
def foo
puts 'result'
end | def foo
puts 'result'
end | Correct. | Ruby |
<p>message <b>world</p></b> | <p>message <b>world</b></p> | Nest properly. | HTML |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
#content {{ color: #fff; }} | #content {{ color: #fff; }} | Correct. | CSS |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
h1 {{ font-size:96px color:red; }} | h1 {{ font-size:96px; color:red; }} | Add semicolon. | CSS |
if c > 10
print('world') | if c > 10:
print('world') | Colon missing after if. | Python |
'11' + 12 | 11 + 12 | Avoid string coercion. | JavaScript |
for bar in range(11)
print(bar) | for bar in range(11):
print(bar) | Colon after for. | Python |
List(62,45,67) | List(62,45,67) | Correct. | Scala |
x == '5' | x === 5 | Use strict equality. | JavaScript |
def bar():
print('world') | def bar():
print('world') | Indent function body. | Python |
if [ $bar = 99 ]; then | if [ "$bar" = 99 ]; then | Quote variable. | Shell |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
{{'id':'result'}} | {{"id":"result"}} | Use double quotes. | JSON |
my @arr = (17,85,39); | my @arr = (17,85,39); | Correct. | Perl |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.