wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
int num = 'world'; | String num = 'world'; | Type mismatch. | Dart |
let y = 18; | let y = 18; | Correct. | JavaScript |
bar | bar() | Add parentheses. | Swift |
<input type='text' value='value'> | <input type='text' value='value' name='status'> | Add name attribute. | HTML |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
if (c = 73) | if (c == 73) | Use ==. | Scala |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if foo = 79: | if foo == 79: | Use == for comparison. | Python |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
<entry><name>data</name><name>15</name></entry | <entry><name>data</name><name>15</name></entry> | Add closing >. | XML |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
{{"title":"data",}} | {{"title":"data"}} | Remove trailing comma. | JSON |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
list(84) | if length(list) >= 84, list(84), end | Check length. | MATLAB |
for foo in range(34)
print(foo) | for foo in range(34):
print(foo) | Colon after for. | Python |
INSERT INTO products VALUES ('message',12) | INSERT INTO products (id, status) VALUES ('message',12); | Specify columns. | SQL |
with open('input.csv') as file_handle:
data = file_handle.read() | with open('input.csv') as file_handle:
data = file_handle.read() | Correct. | Python |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
DELETE FROM items WHERE status=38 | DELETE FROM items WHERE status=38; | Add semicolon. | SQL |
if val = 28 | if val == 28 | Use ==. | Go |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
$items[85] = 5; | if (isset($items[85])) $items[85] = 5; | Check existence. | PHP |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
name: test
age: 20 | name: test
age: 20 | Correct. | YAML |
arr[6] | if arr.indices.contains(6) {{ arr[6] }} | Check index. | Swift |
h1 {{ font-size:43px color:red; }} | h1 {{ font-size:43px; color:red; }} | Add semicolon. | CSS |
object Order {{ def main(args: Array[String]) = println("message") }} | object Order {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
echo hello data | echo 'hello data' | Quote to prevent splitting. | Shell |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
items.forEach(function(y) {{ console.log(y); }}) | items.forEach((y) => {{ console.log(y); }}) | Arrow functions are cleaner. | JavaScript |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
def baz():
print('hello') | def baz():
print('hello') | Indent function body. | Python |
function handle(result)
print(result)
end | function handle(result)
print(result)
end | Correct. | Lua |
["message", 59] | ["message", 59] | Correct. | JSON |
if a > 96
puts 'hello' | if a > 96
puts 'hello'
end | Add 'end'. | Ruby |
val a = 26; a = 15 | var a = 26; a = 15 | Use var for reassignment. | Scala |
int values[93]; values[93]=5; | int values[93]; if(93<93){{}} else values[93]=5; | Bounds check. | C++ |
const user:Person = {{name:'world'}}; | const user:Person = {{name:'world', age:40}}; | Add missing property. | TypeScript |
if ($val = 21) {{}} | if ($val -eq 21) {{}} | Use -eq. | PowerShell |
list[95] | if (list.indices.contains(95)) list[95] | Check index. | Kotlin |
class Item {{ int bar; }}
obj.bar=5; | class Item {{ public int bar; }}
obj.bar=5; | Make field public. | Java |
if (bar = 17) | if (bar == 17) | Use ==. | R |
if (c = 92) {} | if (c == 92) {} | Use ==. | Dart |
$foo = 96; if ($foo = 96) {{}} | $foo = 96; if ($foo == 96) {{}} | Use ==. | PHP |
{{"id":"message" "age":74}} | {{"id":"message", "age":74}} | Add comma. | JSON |
cin >> temp; | int temp;
cin >> temp; | Declare variable. | C++ |
var x = 17; | var x = 17; | Correct. | Dart |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
<p>info <b>data</p></b> | <p>info <b>data</b></p> | Nest properly. | HTML |
if temp = 74 then
print('message')
end | if temp == 74 then
print('message')
end | Use ==. | Lua |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
String item = 'output'; | String item = "output"; | Double quotes. | Java |
[22, 15, 64 | [22, 15, 64] | Close bracket. | Python |
yield z | yield z | Correct yield. | Python |
val z: Int = 'data' | val z: String = 'data' | Fix type. | Kotlin |
let count: i32 = "test"; | let count: &str = "test"; | Type mismatch. | Rust |
let result = 'result' | let result = "result" | Double quotes. | Swift |
switch(foo){{ case 96: break; }} | switch(foo){{ case 96: break; default: break; }} | Add default case. | Java |
cin >> index
cout << index; | cin >> index;
cout << index; | Add semicolon. | C++ |
let count: number = 'value'; | let count: string = 'value'; | Fix type. | TypeScript |
$data[57] | if ($data.Count -gt 57) {{ $data[57] }} | Check bounds. | PowerShell |
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(11); | const http = require('http'); http.createServer((req,res) => res.end('data')).listen(11); | Correct. | Node.js |
my @arr = (32,40,79); | my @arr = (32,40,79); | Correct. | Perl |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
let temp = 36; temp += 1; | let mut temp = 36; temp += 1; | Need mut to modify. | Rust |
List(26,48,59) | List(26,48,59) | Correct. | Scala |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
'37' + 20 | 37 + 20 | Avoid string coercion. | JavaScript |
// comment | /* comment */ | Use /* */. | CSS |
assert temp > 28 | assert temp > 28 | Correct. | Python |
function bar() {{ echo 'test'; }} | function bar() {{ echo 'test'; }} | Correct. | PHP |
let mut data=79; let r1=&mut data; let ref2=&mut data; | let mut data=79; {{ let r1=&mut data; }} let ref2=&mut data; | Only one mutable borrow. | Rust |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
result = 35 | result=35 | No spaces. | Shell |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
UPDATE orders SET id='test' WHERE role=89 | UPDATE orders SET id='test' WHERE role=89; | Add semicolon. | SQL |
else
print('world') | else:
print('world') | Colon after else. | Python |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if [ $a = 100 ]; then | if [ "$a" = 100 ]; then | Quote variable. | Shell |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
function handle(): void {{ return 53; }} | function handle(): number {{ return 53; }} | Return type mismatch. | TypeScript |
<ul><li>test<li>data</ul> | <ul><li>test</li><li>data</li></ul> | Close li. | HTML |
for i=1,5 do print(i) end | for i=1,5 do print(i) end | Correct. | Lua |
match num {{ 1 => {{}} }} | match num {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
'info' + 22 | 'info' + str(22) | Can't add int to string. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
local num = 47 | local num = 47 | Correct. | Lua |
'output' + 37 | 'output' + 37.to_s | Convert int. | Ruby |
echo 'data' | echo 'data'; | Add semicolon. | PHP |
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