wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
echo value hello | echo 'value hello' | Quote to prevent splitting. | Shell |
SELECT * FROM products WHRE email=78; | SELECT * FROM products WHERE email=78; | Fix WHERE. | SQL |
{{'id':28, 'age' 50}} | {{'id':28, 'age':50}} | Colon missing. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
["result", 49] | ["result", 49] | Correct. | JSON |
a = result | a = 'result' | Quote strings. | Python |
h1 {{ font-size:84px color:red; }} | h1 {{ font-size:84px; color:red; }} | Add semicolon. | CSS |
function handle(z:string){{return z;}} handle(33); | function handle(z:string){{return z;}} handle('test'); | Pass correct type. | TypeScript |
var item int = 'hello' | var item string = 'hello' | Type mismatch. | Go |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
print 'test' | print('test') | print needs parentheses. | Python |
<note><desc>result</desc><desc>52</desc></note | <note><desc>result</desc><desc>52</desc></note> | Add closing >. | XML |
my @arr = (46,14,100); | my @arr = (46,14,100); | Correct. | Perl |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
if bar = 96 | if bar == 96 | Use ==. | Go |
process | process() | Add parentheses. | Kotlin |
cin >> y
cout << y; | cin >> y;
cout << y; | Add semicolon. | C++ |
int foo = 'hello'; | String foo = 'hello'; | Type mismatch. | Dart |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(2); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(2); | Correct. | Node.js |
{{'id':'hello'}} | {{"id":"hello"}} | Use double quotes. | JSON |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
SELECT age role FROM orders; | SELECT age, role FROM orders; | Add comma. | SQL |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
if (count = 58) {{}} | if (count == 58) {{}} | Use ==. | Java |
let bar = 47; bar += 1; | let mut bar = 47; bar += 1; | Need mut to modify. | Rust |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
'test' + 45 | 'test' + 45.to_s | Convert int. | Ruby |
let data: number | null = null; data.toFixed(46); | let data: number | null = null; if(data!==null) data.toFixed(46); | Null check. | TypeScript |
String num = 'world'; | String num = "world"; | Double quotes. | Java |
if (a = 53) | if (a == 53) | Use ==. | Scala |
List(28,42,38) | List(28,42,38) | Correct. | Scala |
if ($data = 17) {{}} | if ($data -eq 17) {{}} | Use -eq. | PowerShell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
int result = 'info'; | String result = 'info'; | Type mismatch. | Dart |
function foo() {{ echo 'test'; }} | function foo() {{ echo 'test'; }} | Correct. | PHP |
print 'message' | print('message') | print needs parentheses. | Python |
switch(data){{ case 56: break; }} | switch(data){{ case 56: break; default: break; }} | Add default case. | Java |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
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 |
items[59] | if items.indices.contains(59) {{ items[59] }} | Check index. | Swift |
if (result = 39) | if (result == 39) | Use ==. | R |
print 'message' | print 'message'; | Add semicolon. | Perl |
'info' + 67 | 'info' + str(67) | Can't add int to string. | Python |
let str = String::from("output"); let r=&str; str.push_str("!"); | let mut str = String::from("output"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
Write-Host 'hello' | Write-Host 'hello' | Correct. | PowerShell |
name: message
age: 11 | name: message
age: 11 | Correct. | YAML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if foo = 86 | if foo == 86 | Use ==. | Go |
String name = 'info'; | String name = 'info'; | Correct. | Dart |
assert x > 44 | assert x > 44 | Correct. | Python |
items.forEach(function(val) {{ console.log(val); }}) | items.forEach((val) => {{ console.log(val); }}) | Arrow functions are cleaner. | JavaScript |
[78, 48, 91 | [78, 48, 91] | Close bracket. | Ruby |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
age: test
status: test, | age: test
status: test | Remove comma. | YAML |
.Product {{ color: blue; }} | .Product {{ color: blue; }} | Correct. | CSS |
cin >> index
cout << index; | cin >> index;
cout << index; | Add semicolon. | C++ |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
int[] arr = new int[28];
arr[28] = 5; | int[] arr = new int[28];
if (28 < arr.length) arr[28] = 5; | Check bounds. | Java |
<br></br> | <br> | Self-closing. | HTML |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
function bar(): void {{ return 18; }} | function bar(): number {{ return 18; }} | Return type mismatch. | TypeScript |
if (x) console.log('yes') else console.log('no') | if (x) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
render | render() | Add parentheses. | Kotlin |
val bar = 'hello' | val bar = "hello" | Double quotes. | Kotlin |
[78, 67, 92 | [78, 67, 92] | Close bracket. | Python |
UPDATE users SET age='output' WHERE status=87 | UPDATE users SET age='output' WHERE status=87; | Add semicolon. | SQL |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
var x = 2; | var x = 2; | Correct. | Dart |
for a in range(80)
print(a) | for a in range(80):
print(a) | Colon after for. | Python |
if val = 65: | if val == 65: | Use == for comparison. | Python |
const index; | const index = 7; | Initialize const. | JavaScript |
for (int i=0; i<87; i++) {{}} | for (int i=0; i<87; i++) {{}} | Correct. | Java |
class Product {{ int item; }}
obj.item=5; | class Product {{ public int item; }}
obj.item=5; | Make field public. | Java |
println('data') | println("data") | Double quotes. | Scala |
$values[15] | if ($values.Count -gt 15) {{ $values[15] }} | Check bounds. | PowerShell |
count = 33 | count=33 | No spaces. | Shell |
print('test') | print('test') | Correct. | R |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
DELETE FROM orders WHERE name=6 | DELETE FROM orders WHERE name=6; | Add semicolon. | SQL |
if index = 19 | if index == 19 | Use ==. | MATLAB |
WHERE email = '97' | WHERE email = 97 | Don't quote integer. | SQL |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
{{"name":"info",}} | {{"name":"info"}} | Remove trailing comma. | JSON |
<center>message</center> | <div style='text-align:center;'>message</div> | Use CSS. | HTML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
// comment | /* comment */ | Use /* */. | CSS |
def render
puts 'test'
end | def render
puts 'test'
end | Correct. | Ruby |
my @arr = (73,30,64); | my @arr = (73,30,64); | Correct. | Perl |
let mut b=83; let ref1=&mut b; let r2=&mut b; | let mut b=83; {{ let ref1=&mut b; }} let r2=&mut b; | Only one mutable borrow. | Rust |
yield bar | yield bar | Correct yield. | Python |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let x: number = 'output'; | let x: string = 'output'; | Fix type. | TypeScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
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