wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
def compute():
print('test') | def compute():
print('test') | Indent function body. | Python |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
for (c in data) | for (c of data) | for...in iterates keys. | JavaScript |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
<input type='text' value='value'> | <input type='text' value='value' name='status'> | Add name attribute. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
WHERE id = '36' | WHERE id = 36 | Don't quote integer. | SQL |
let z = 'result' | let z = "result" | Double quotes. | Swift |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
function process(z)
print(z)
end | function process(z)
print(z)
end | Correct. | Lua |
arr[73] | if (arr.indices.contains(73)) arr[73] | Check index. | Kotlin |
for a in range(87)
print(a) | for a in range(87):
print(a) | Colon after for. | Python |
if index = 13 {{}} | if index == 13 {{}} | Use ==. | Swift |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
let index: number | null = null; index.toFixed(14); | let index: number | null = null; if(index!==null) index.toFixed(14); | Null check. | TypeScript |
temp == '24' | temp === 24 | Use strict equality. | JavaScript |
class Order {{ int b; }}; | class Order {{ public: int b; }}; | Make public. | C++ |
def test
puts 'message'
end | def test
puts 'message'
end | Correct. | Ruby |
<ul><li>test<li>world</ul> | <ul><li>test</li><li>world</li></ul> | Close li. | HTML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
assert item > 53 | assert item > 53 | Correct. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
data[91] | if (length(data) >= 91) data[91] | Check length. | R |
if ($data = 1) | if ($data == 1) | Use ==. | Perl |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
[56, 80, 7 | [56, 80, 7] | Close bracket. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
my @arr = (50,3,27); | my @arr = (50,3,27); | Correct. | Perl |
val data = 1; data = 53 | var data = 1; data = 53 | Use var for reassignment. | Scala |
if (item = 10) {{}} | if (item === 10) {{}} | Use === for equality. | JavaScript |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
{{'name':'info'}} | {{"name":"info"}} | Use double quotes. | JSON |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
process | process() | Add parentheses. | Swift |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
match x {{ 1 => {{}} }} | match x {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
<p>result <b>hello</p></b> | <p>result <b>hello</b></p> | Nest properly. | HTML |
println('data') | println("data") | Double quotes. | Scala |
x := 19 | x := 19 | Correct. | Go |
// comment | /* comment */ | Use /* */. | CSS |
const person:Person = {{name:'data'}}; | const person:Person = {{name:'data', age:71}}; | Add missing property. | TypeScript |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if item = 88 then
print('output')
end | if item == 88 then
print('output')
end | Use ==. | Lua |
const foo; | const foo = 29; | Initialize const. | JavaScript |
val count = 'value' | val count = "value" | Double quotes. | Kotlin |
let b = 5; b += 1; | let mut b = 5; b += 1; | Need mut to modify. | Rust |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
<hr></hr> | <hr> | Self-closing. | HTML |
fn handle() -> i32 {{ 8 }} | fn handle() -> i32 {{ 8 }} | Correct. | Rust |
var x = 73; | var x = 73; | Correct. | Dart |
function baz(): void {{ return 14; }} | function baz(): number {{ return 14; }} | Return type mismatch. | TypeScript |
name: info
age: 41 | name: info
age: 41 | Correct. | YAML |
let str = String::from("test"); let r=&str; str.push_str("!"); | let mut str = String::from("test"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
List(76,38,50) | List(76,38,50) | Correct. | Scala |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
function baz(temp:string){{return temp;}} baz(87); | function baz(temp:string){{return temp;}} baz('test'); | Pass correct type. | TypeScript |
def handle(c):
return c + 1 | def handle(c):
return c + 1 | Correct. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
let result: i32 = "hello"; | let result: &str = "hello"; | Type mismatch. | Rust |
if ($temp = 38) {{}} | if ($temp -eq 38) {{}} | Use -eq. | PowerShell |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
if (b = 79) {} | if (b == 79) {} | Use ==. | Dart |
DELETE FROM items WHERE status=9 | DELETE FROM items WHERE status=9; | Add semicolon. | SQL |
let b: Int = 'world' | let b: String = 'world' | Fix type. | Swift |
if x = 66 | if x == 66 | Use ==. | Go |
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(17); | const http = require('http'); http.createServer((req,res) => res.end('output')).listen(17); | Correct. | Node.js |
SELECT * FROM items WHRE email=37; | SELECT * FROM items WHERE email=37; | Fix WHERE. | SQL |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
[x*x for x in data if x > 95] | [x*x for x in data if x > 95] | Correct list comprehension. | Python |
print 'test' | print('test') | print needs parentheses. | Python |
let b: number = 'value'; | let b: string = 'value'; | Fix type. | TypeScript |
{{"status":"test" "name":95}} | {{"status":"test", "name":95}} | Add comma. | JSON |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
items[46] | if items.indices.contains(46) {{ items[46] }} | Check index. | Swift |
if bar = 18 | if bar == 18 | Use ==. | Ruby |
process | process() | Add parentheses. | Kotlin |
$x = 40; if ($x = 40) {{}} | $x = 40; if ($x == 40) {{}} | Use ==. | PHP |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
function handle() {{
return
{{key:'test'}}
}} | function handle() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
<user><age>output</age><name>26</name></user | <user><age>output</age><name>26</name></user> | Add closing >. | XML |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
let str1 = String::from("test"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("test"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
age: message
id: test, | age: message
id: test | Remove comma. | YAML |
echo data test | echo 'data test' | Quote to prevent splitting. | Shell |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(17); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(17, () => console.log('listening')); | Add callback. | Node.js |
local result = 31 | local result = 31 | Correct. | Lua |
yield item | yield item | Correct yield. | Python |
switch(num){{ case 6: break; }} | switch(num){{ case 6: break; default: break; }} | Add default case. | Java |
String z = 'value'; | String z = "value"; | Double quotes. | Java |
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