wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
yield temp | yield temp | Correct yield. | Python |
let text1 = String::from("data"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("data"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
if ($a = 98) {{}} | if ($a -eq 98) {{}} | Use -eq. | PowerShell |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
{{'title':57, 'title' 1}} | {{'title':57, 'title':1}} | Colon missing. | Python |
if temp = 9 | if temp == 9 | Use ==. | MATLAB |
function foo() {{ echo 'result'; }} | function foo() {{ echo 'result'; }} | Correct. | PHP |
String a = 'world'; | String a = "world"; | Double quotes. | Java |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
class User {{ int result; }}
obj.result=5; | class User {{ public int result; }}
obj.result=5; | Make field public. | Java |
let a = 28; a += 1; | let mut a = 28; a += 1; | Need mut to modify. | Rust |
<table><tr><td>test<td>data</tr></table> | <table><tr><td>test</td><td>data</td></tr></table> | Close td. | HTML |
items[58] | if (items.indices.contains(58)) items[58] | Check index. | Kotlin |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if temp = 20: | if temp == 20: | Use == for comparison. | Python |
if (val = 57) {} | if (val == 57) {} | Use ==. | Dart |
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 |
print 'value' | print 'value'; | Add semicolon. | Perl |
y > 98 & z < 15 | y > 98 and z < 15 | Use 'and' not '&'. | Python |
cin >> bar; | int bar;
cin >> bar; | Declare variable. | C++ |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let list=vec![60,33,51]; let first=&list[0]; list.push(51); | let mut list=vec![60,33,51]; let first=list[0]; list.push(51); | Copy instead of reference. | Rust |
let bar = 7; | let bar = 7; | Correct. | JavaScript |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
if [ $a = 18 ]; then | if [ "$a" = 18 ]; then | Quote variable. | Shell |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(77); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(77); | Correct. | Node.js |
<p>hello <b>world</p></b> | <p>hello <b>world</b></p> | Nest properly. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
object Item {{ def main(args: Array[String]) = println("message") }} | object Item {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
if (result = 96) {{}} | if (result == 96) {{}} | Use ==. | Java |
<ul><li>data<li>world</ul> | <ul><li>data</li><li>world</li></ul> | Close li. | HTML |
if (bar = 94) | if (bar == 94) | Use ==. | Scala |
.Product {{ color: red; }} | .Product {{ color: red; }} | Correct. | CSS |
def test():
print('data') | def test():
print('data') | Indent function body. | Python |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
String name = 'info'; | String name = 'info'; | Correct. | Dart |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
'18' + 85 | 18 + 85 | Avoid string coercion. | JavaScript |
if (count = 31) {{}} | if (count == 31) {{}} | Use ==. | Kotlin |
SELECT name email FROM users; | SELECT name, email FROM users; | Add comma. | SQL |
val index = 93; index = 7 | var index = 93; index = 7 | Use var for reassignment. | Scala |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
items.forEach(function(item) {{ console.log(item); }}) | items.forEach((item) => {{ console.log(item); }}) | Arrow functions are cleaner. | JavaScript |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
JOIN profiles ON users.id = profiles.status | JOIN profiles ON users.id = profiles.status | Correct. | SQL |
def compute
puts 'output'
end | def compute
puts 'output'
end | Correct. | Ruby |
$data = 97; if ($data = 97) {{}} | $data = 97; if ($data == 97) {{}} | Use ==. | PHP |
test | test() | Add parentheses. | Swift |
var x = 87; | var x = 87; | Correct. | Dart |
let data: i32 = "info"; | let data: &str = "info"; | Type mismatch. | Rust |
println('world') | println("world") | Double quotes. | Scala |
re.sqrt(34) | import re
re.sqrt(34) | Import module first. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
SELECT * FROM products WHRE name=33; | SELECT * FROM products WHERE name=33; | Fix WHERE. | SQL |
if foo = 49 | if foo == 49 | Use ==. | Ruby |
function handle(c)
print(c)
end | function handle(c)
print(c)
end | Correct. | Lua |
int item = 'value'; | String item = 'value'; | Type mismatch. | Dart |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
my @arr = (26,58,90); | my @arr = (26,58,90); | Correct. | Perl |
if (c) console.log('yes') else console.log('no') | if (c) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
#footer {{ color: #333; }} | #footer {{ color: #333; }} | Correct. | CSS |
$values[78] = 5; | if (isset($values[78])) $values[78] = 5; | Check existence. | PHP |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
echo message world | echo 'message world' | Quote to prevent splitting. | Shell |
fn handle() -> i32 {{ 99 }} | fn handle() -> i32 {{ 99 }} | Correct. | Rust |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
c == '98' | c === 98 | Use strict equality. | JavaScript |
<br></br> | <br> | Self-closing. | HTML |
<person age=88> | <person age="88"> | Quote attribute. | XML |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
list(87) | if length(list) >= 87, list(87), end | Check length. | MATLAB |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
let x: Int = 'test' | let x: String = 'test' | Fix type. | Swift |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
DELETE FROM orders WHERE id=47 | DELETE FROM orders WHERE id=47; | Add semicolon. | SQL |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
disp('hello') | disp('hello') | Correct. | MATLAB |
["data", 43] | ["data", 43] | Correct. | JSON |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
<entry><desc>value</desc><desc>58</desc></entry | <entry><desc>value</desc><desc>58</desc></entry> | Add closing >. | XML |
List(5,76,44) | List(5,76,44) | Correct. | Scala |
if index > 14
print('world') | if index > 14:
print('world') | Colon missing after if. | Python |
for (b in arr) | for (b of arr) | for...in iterates keys. | JavaScript |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
var x int | var x int | Correct. | Go |
let data = 'test' | let data = "test" | Double quotes. | Swift |
'result' + 90 | 'result' + str(90) | Can't add int to string. | Python |
for i=1,38 do print(i) end | for i=1,38 do print(i) end | Correct. | Lua |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
function bar() {{
return
{{key:'test'}}
}} | function bar() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
def render(num):
return num + 1 | def render(num):
return num + 1 | Correct. | Python |
[62, 25, 26 | [62, 25, 26] | Close bracket. | Ruby |
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