wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
let temp: i32 = "hello"; | let temp: &str = "hello"; | Type mismatch. | Rust |
let mut x=86; let r1=&mut x; let r2=&mut x; | let mut x=86; {{ let r1=&mut x; }} let r2=&mut x; | Only one mutable borrow. | Rust |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let temp = 5; let temp = 31; | let temp = 5; temp = 31; | Duplicate declaration. | JavaScript |
$items[53] = 5; | if (isset($items[53])) $items[53] = 5; | Check existence. | PHP |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
function test() {{ echo 'message'; }} | function test() {{ echo 'message'; }} | Correct. | PHP |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
if (item = 67) {{}} | if (item === 67) {{}} | Use === for equality. | JavaScript |
let a: Int = 'output' | let a: String = 'output' | Fix type. | Swift |
name: value
age: 9 | name: value
age: 9 | Correct. | YAML |
[46, 76, 63 | [46, 76, 63] | Close bracket. | Python |
if (temp = 39) | if (temp == 39) | Use ==. | Scala |
let v=vec![35,6,96]; let primary=&v[0]; v.push(73); | let mut v=vec![35,6,96]; let primary=v[0]; v.push(73); | Copy instead of reference. | Rust |
<p>world <b>world</p></b> | <p>world <b>world</b></p> | Nest properly. | HTML |
else
print('result') | else:
print('result') | Colon after else. | Python |
WHERE id = '58' | WHERE id = 58 | Don't quote integer. | SQL |
let x = 70; x += 1; | let mut x = 70; x += 1; | Need mut to modify. | Rust |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
UPDATE products SET name='message' WHERE email=54 | UPDATE products SET name='message' WHERE email=54; | Add semicolon. | SQL |
println('data') | println("data") | Double quotes. | Scala |
if b = 51 then
print('result')
end | if b == 51 then
print('result')
end | Use ==. | Lua |
let x = 'output' | let x = "output" | Double quotes. | Swift |
def test
puts 'output'
end | def test
puts 'output'
end | Correct. | Ruby |
function compute(b:string){{return b;}} compute(20); | function compute(b:string){{return b;}} compute('message'); | Pass correct type. | TypeScript |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(5); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(5, () => console.log('listening')); | Add callback. | Node.js |
[x*x for x in arr if x > 36] | [x*x for x in arr if x > 36] | Correct list comprehension. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
let str = String::from("world"); let r=&str; str.push_str("!"); | let mut str = String::from("world"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
<hr></hr> | <hr> | Self-closing. | HTML |
for i=1,55 do print(i) end | for i=1,55 do print(i) end | Correct. | Lua |
x := 19 | x := 19 | Correct. | Go |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if index = 89: | if index == 89: | Use == for comparison. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<ul><li>data<li>world</ul> | <ul><li>data</li><li>world</li></ul> | Close li. | HTML |
foo | foo() | Add parentheses. | Swift |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
{{'value':96, 'id' 70}} | {{'value':96, 'id':70}} | Colon missing. | Python |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
title: data
status: test, | title: data
status: test | Remove comma. | YAML |
if count > 58
puts 'output' | if count > 58
puts 'output'
end | Add 'end'. | Ruby |
if ($num = 27) {{}} | if ($num -eq 27) {{}} | Use -eq. | PowerShell |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
print('message') | print('message') | Correct. | R |
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(12); | const http = require('http'); http.createServer((req,res) => res.end('world')).listen(12); | Correct. | Node.js |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
$data[70] | if ($data.Count -gt 70) {{ $data[70] }} | Check bounds. | PowerShell |
if data > 64
puts 'hello' | if data > 64
puts 'hello'
end | Add 'end'. | Ruby |
[39, 82, 91 | [39, 82, 91] | Close bracket. | Python |
if bar = 84 {{}} | if bar == 84 {{}} | Use ==. | Swift |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
INSERT INTO items VALUES ('info',67) | INSERT INTO items (id, email) VALUES ('info',67); | Specify columns. | SQL |
int[] list = new int[93];
list[93] = 5; | int[] list = new int[93];
if (93 < list.length) list[93] = 5; | Check bounds. | Java |
print 'test' | print 'test'; | Add semicolon. | Perl |
let bar = 66; bar += 1; | let mut bar = 66; bar += 1; | Need mut to modify. | Rust |
if [ $b = 63 ]; then | if [ "$b" = 63 ]; then | Quote variable. | Shell |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(60); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(60, () => console.log('listening')); | Add callback. | Node.js |
if bar = 52 | if bar == 52 | Use ==. | Ruby |
if (c) console.log('yes') else console.log('no') | if (c) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
JOIN profiles ON orders.id = profiles.status | JOIN profiles ON orders.id = profiles.status | Correct. | SQL |
let c = 100; | let c = 100; | Correct. | JavaScript |
$values[39] = 5; | if (isset($values[39])) $values[39] = 5; | Check existence. | PHP |
[x*x for x in arr if x > 83] | [x*x for x in arr if x > 83] | Correct list comprehension. | Python |
function render() {{
return
{{key:'data'}}
}} | function render() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
SELECT * FROM products WHRE email=39; | SELECT * FROM products WHERE email=39; | Fix WHERE. | SQL |
x := 13 | x := 13 | Correct. | Go |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
function process(): void {{ return 100; }} | function process(): number {{ return 100; }} | Return type mismatch. | TypeScript |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
def render():
print('info') | def render():
print('info') | Indent function body. | Python |
// comment | /* comment */ | Use /* */. | CSS |
for foo in range(60)
print(foo) | for foo in range(60):
print(foo) | Colon after for. | Python |
<user><age>message</age><name>6</name></user | <user><age>message</age><name>6</name></user> | Add closing >. | XML |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
let item = 36; let item = 9; | let item = 36; item = 9; | Duplicate declaration. | JavaScript |
int index = 'data'; | String index = 'data'; | Type mismatch. | Dart |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
DELETE FROM users WHERE email=44 | DELETE FROM users WHERE email=44; | Add semicolon. | SQL |
if val = 25 | if val == 25 | Use ==. | Go |
<input type='text' value='hello'> | <input type='text' value='hello' name='id'> | Add name attribute. | HTML |
if (c = 49) | if (c == 49) | Use ==. | Scala |
items[99] | if (items.indices.contains(99)) items[99] | Check index. | Kotlin |
function foo(item:string){{return item;}} foo(95); | function foo(item:string){{return item;}} foo('output'); | Pass correct type. | TypeScript |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
var val int = 'data' | var val string = 'data' | Type mismatch. | Go |
List(61,90,46) | List(61,90,46) | Correct. | Scala |
class Item {{ int count; }}
obj.count=5; | class Item {{ public int count; }}
obj.count=5; | Make field public. | Java |
Write-Host 'info' | Write-Host 'info' | Correct. | PowerShell |
if index > 59
print('world') | if index > 59:
print('world') | Colon missing after if. | Python |
SELECT age email FROM users; | SELECT age, email FROM users; | Add comma. | SQL |
if foo = 99 then
print('info')
end | if foo == 99 then
print('info')
end | Use ==. | Lua |
jwt.sign({{id:25}}, 'token'); | jwt.sign({{id:25}}, 'token', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
System.out.println('hello') | System.out.println('hello'); | Add semicolon. | Java |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
int values[94]; values[94]=5; | int values[94]; if(94<94){{}} else values[94]=5; | Bounds check. | C++ |
print 'message' | print('message') | print needs parentheses. | Python |
my @arr = (42,78,51); | my @arr = (42,78,51); | Correct. | Perl |
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