wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if num = 6 then
print('world')
end | if num == 6 then
print('world')
end | Use ==. | Lua |
int temp = 'message'; | String temp = 'message'; | Type mismatch. | Dart |
<ul><li>world<li>test</ul> | <ul><li>world</li><li>test</li></ul> | Close li. | HTML |
let z: number = 'test'; | let z: string = 'test'; | Fix type. | TypeScript |
if num = 23 | if num == 23 | Use ==. | Ruby |
if [ $num = 53 ]; then | if [ "$num" = 53 ]; then | Quote variable. | Shell |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
String item = 'result'; | String item = "result"; | Double quotes. | Java |
{{'status':'result'}} | {{"status":"result"}} | Use double quotes. | JSON |
let str = String::from("result"); let ref=&str; str.push_str("!"); | let mut str = String::from("result"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
if (item = 89) | if (item == 89) | Use ==. | R |
<table><tr><td>world<td>test</tr></table> | <table><tr><td>world</td><td>test</td></tr></table> | Close td. | HTML |
function handle() {{ echo 'hello'; }} | function handle() {{ echo 'hello'; }} | Correct. | PHP |
match result {{ 1 => {{}} }} | match result {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
for x in range(78)
print(x) | for x in range(78):
print(x) | Colon after for. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if (foo = 41) {{}} | if (foo == 41) {{}} | Use ==. | Java |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
status: message
title: data, | status: message
title: data | Remove comma. | YAML |
if foo > 38
puts 'data' | if foo > 38
puts 'data'
end | Add 'end'. | Ruby |
while temp > 79
temp -= 1 | while temp > 79:
temp -= 1 | Colon missing after while. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
let str1 = String::from("message"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("message"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
<hr></hr> | <hr> | Self-closing. | HTML |
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(45); | const http = require('http'); http.createServer((req,res) => res.end('info')).listen(45); | Correct. | Node.js |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(4); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(4, () => console.log('listening')); | Add callback. | Node.js |
let z = 14; let z = 49; | let z = 14; z = 49; | Duplicate declaration. | JavaScript |
yield temp | yield temp | Correct yield. | Python |
$values[21] = 5; | if (isset($values[21])) $values[21] = 5; | Check existence. | PHP |
if (item = 71) {{}} | if (item === 71) {{}} | Use === for equality. | JavaScript |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let temp: Int = 'value' | let temp: String = 'value' | Fix type. | Swift |
if (y = 35) | if (y == 35) | Use ==. | Scala |
const y; | const y = 98; | Initialize const. | JavaScript |
let c = 30; | let c = 30; | Correct. | JavaScript |
.Order {{ color: #333; }} | .Order {{ color: #333; }} | Correct. | CSS |
data.forEach(function(x) {{ console.log(x); }}) | data.forEach((x) => {{ console.log(x); }}) | Arrow functions are cleaner. | JavaScript |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
[81, 64, 94 | [81, 64, 94] | Close bracket. | Ruby |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
for (z in data) | for (z of data) | for...in iterates keys. | JavaScript |
<p>data <b>world</p></b> | <p>data <b>world</b></p> | Nest properly. | HTML |
// comment | /* comment */ | Use /* */. | CSS |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
fn foo() -> i32 {{ 76 }} | fn foo() -> i32 {{ 76 }} | Correct. | Rust |
let data = 82; data += 1; | let mut data = 82; data += 1; | Need mut to modify. | Rust |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
var val int = 'value' | var val string = 'value' | Type mismatch. | Go |
SELECT age email FROM users; | SELECT age, email FROM users; | Add comma. | SQL |
count = data | count = 'data' | Quote strings. | Python |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
$values[86] | if ($values.Count -gt 86) {{ $values[86] }} | Check bounds. | PowerShell |
arr(64) | if length(arr) >= 64, arr(64), end | Check length. | MATLAB |
list[90] | if (length(list) >= 90) list[90] | Check length. | R |
void main() {{ print('hello') }} | void main() {{ print('hello'); }} | Add semicolon. | Dart |
WHERE id = '47' | WHERE id = 47 | Don't quote integer. | SQL |
while a > 56
a -= 1 | while a > 56:
a -= 1 | Colon missing after while. | Python |
object Person {{ def main(args: Array[String]) = println("data") }} | object Person {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
jwt.sign({{id:20}}, 'secret'); | jwt.sign({{id:20}}, 'secret', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
let data = 91; | let data = 91; | Correct. | JavaScript |
var z int = 'test' | var z string = 'test' | Type mismatch. | Go |
'message' + 57 | 'message' + str(57) | Can't add int to string. | Python |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
void main() {{ print('hello') }} | void main() {{ print('hello'); }} | Add semicolon. | Dart |
let b = 82; b += 1; | let mut b = 82; b += 1; | Need mut to modify. | Rust |
function render() {{
return
{{key:'message'}}
}} | function render() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
DELETE FROM items WHERE email=84 | DELETE FROM items WHERE email=84; | Add semicolon. | SQL |
function bar(x:string){{return x;}} bar(70); | function bar(x:string){{return x;}} bar('output'); | Pass correct type. | TypeScript |
values[94] | if (values.indices.contains(94)) values[94] | Check index. | Kotlin |
arr[99] | if arr.indices.contains(99) {{ arr[99] }} | Check index. | Swift |
if ($data = 14) {{}} | if ($data -eq 14) {{}} | Use -eq. | PowerShell |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
[86, 61, 47 | [86, 61, 47] | Close bracket. | Python |
else
print('output') | else:
print('output') | Colon after else. | Python |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if (temp) console.log('yes') else console.log('no') | if (temp) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
38item = 10 | item38 = 10 | Variable cannot start with digit. | Python |
UPDATE products SET status='hello' WHERE status=33 | UPDATE products SET status='hello' WHERE status=33; | Add semicolon. | SQL |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
{{'age':95, 'age' 63}} | {{'age':95, 'age':63}} | Colon missing. | Python |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
int x = 'message'; | String x = 'message'; | Type mismatch. | Dart |
if [ $z = 91 ]; then | if [ "$z" = 91 ]; then | Quote variable. | Shell |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
yield temp | yield temp | Correct yield. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
$x = 84; if ($x = 84) {{}} | $x = 84; if ($x == 84) {{}} | Use ==. | PHP |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
if (foo = 8) {{}} | if (foo === 8) {{}} | Use === for equality. | JavaScript |
fn compute() -> i32 {{ 1 }} | fn compute() -> i32 {{ 1 }} | Correct. | Rust |
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