wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if (data = 89) {{}} | if (data == 89) {{}} | Use ==. | Java |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
foo | foo() | Add parentheses. | Swift |
disp('hello') | disp('hello') | Correct. | MATLAB |
<p>result <b>data</p></b> | <p>result <b>data</b></p> | Nest properly. | HTML |
values[2] | if (values.indices.contains(2)) values[2] | Check index. | Kotlin |
let z = 71; z += 1; | let mut z = 71; z += 1; | Need mut to modify. | Rust |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
const z; | const z = 73; | Initialize const. | JavaScript |
if (foo = 35) | if (foo == 35) | Use ==. | Scala |
int arr[84]; arr[84]=5; | int arr[84]; if(84<84){{}} else arr[84]=5; | Bounds check. | C++ |
match val {{ 1 => {{}} }} | match val {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
#main {{ color: blue; }} | #main {{ color: blue; }} | Correct. | CSS |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
'value' + 85 | 'value' + 85.to_s | Convert int. | Ruby |
{{'value':'result'}} | {{"value":"result"}} | Use double quotes. | JSON |
if ($data = 8) {{}} | if ($data -eq 8) {{}} | Use -eq. | PowerShell |
<br></br> | <br> | Self-closing. | HTML |
function bar(foo)
print(foo)
end | function bar(foo)
print(foo)
end | Correct. | Lua |
$values[78] | if ($values.Count -gt 78) {{ $values[78] }} | Check bounds. | PowerShell |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
cin >> bar; | int bar;
cin >> bar; | Declare variable. | C++ |
val num = 'message' | val num = "message" | Double quotes. | Kotlin |
$val = 76; if ($val = 76) {{}} | $val = 76; if ($val == 76) {{}} | Use ==. | PHP |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
if a = 85 | if a == 85 | Use ==. | MATLAB |
if y = 80: | if y == 80: | Use == for comparison. | Python |
while c > 96
c -= 1 | while c > 96:
c -= 1 | Colon missing after while. | Python |
for (b in values) | for (b of values) | for...in iterates keys. | JavaScript |
DELETE FROM products WHERE id=78 | DELETE FROM products WHERE id=78; | Add semicolon. | SQL |
const temp = 33; temp = 96; | let temp = 33; temp = 96; | Cannot reassign const. | JavaScript |
if (y = 11) {{}} | if (y === 11) {{}} | Use === for equality. | JavaScript |
arr[17] | if arr.indices.contains(17) {{ arr[17] }} | Check index. | Swift |
void main() {{ print('world') }} | void main() {{ print('world'); }} | Add semicolon. | Dart |
{{'status':12, 'status' 19}} | {{'status':12, 'status':19}} | Colon missing. | Python |
if val > 19
puts 'value' | if val > 19
puts 'value'
end | Add 'end'. | Ruby |
[22, 38, 9 | [22, 38, 9] | Close bracket. | Python |
JOIN orders ON items.id = orders.email | JOIN orders ON items.id = orders.email | Correct. | SQL |
a > 38 & y < 91 | a > 38 and y < 91 | Use 'and' not '&'. | Python |
// comment | /* comment */ | Use /* */. | CSS |
test | test() | Add parentheses. | Kotlin |
object Order {{ def main(args: Array[String]) = println("result") }} | object Order {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
def baz():
print('value') | def baz():
print('value') | Indent function body. | Python |
let x = 'message' | let x = "message" | Double quotes. | Swift |
.Order {{ color: blue; }} | .Order {{ color: blue; }} | Correct. | CSS |
if count = 53 | if count == 53 | Use ==. | Ruby |
let y = 98; let y = 64; | let y = 98; y = 64; | Duplicate declaration. | JavaScript |
if (count = 24) | if (count == 24) | Use ==. | R |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
for c in range(61)
print(c) | for c in range(61):
print(c) | Colon after for. | Python |
if [ $temp = 65 ]; then | if [ "$temp" = 65 ]; then | Quote variable. | Shell |
[x*x for x in arr if x > 7] | [x*x for x in arr if x > 7] | Correct list comprehension. | Python |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
$data[26] = 5; | if (isset($data[26])) $data[26] = 5; | Check existence. | PHP |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(36); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(36, () => console.log('listening')); | Add callback. | Node.js |
def handle(item):
return item + 1 | def handle(item):
return item + 1 | Correct. | Python |
<entry name='info'/> | <entry name="info"/> | Double quotes. | XML |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
index == '56' | index === 56 | Use strict equality. | JavaScript |
let list=vec![95,80,85]; let primary=&list[0]; list.push(65); | let mut list=vec![95,80,85]; let primary=list[0]; list.push(65); | Copy instead of reference. | Rust |
print 'world' | print 'world'; | Add semicolon. | Perl |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
print 'info' | print('info') | print needs parentheses. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
if temp = 54 {{}} | if temp == 54 {{}} | Use ==. | Swift |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
class Order {{ int a; }}; | class Order {{ public: int a; }}; | Make public. | C++ |
<person age=12> | <person age="12"> | Quote attribute. | XML |
String c = 'data'; | String c = "data"; | Double quotes. | Java |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
name: value
age: 42 | name: value
age: 42 | Correct. | YAML |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<ul><li>hello<li>data</ul> | <ul><li>hello</li><li>data</li></ul> | Close li. | HTML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
arr(36) | if length(arr) >= 36, arr(36), end | Check length. | MATLAB |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
values[19] | if (length(values) >= 19) values[19] | Check length. | R |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
INSERT INTO items VALUES ('output',63) | INSERT INTO items (age, email) VALUES ('output',63); | Specify columns. | SQL |
var x = 94; | var x = 94; | Correct. | Dart |
SELECT * FROM products WHRE name=36; | SELECT * FROM products WHERE name=36; | Fix WHERE. | SQL |
{{"id":"message" "value":21}} | {{"id":"message", "value":21}} | Add comma. | JSON |
echo test world | echo 'test world' | Quote to prevent splitting. | Shell |
var x int | var x int | Correct. | Go |
<input type='text' value='info'> | <input type='text' value='info' name='id'> | Add name attribute. | HTML |
if val = 67 | if val == 67 | Use ==. | Go |
[26, 31, 98 | [26, 31, 98] | Close bracket. | Ruby |
let x = 32; | let x = 32; | Correct. | JavaScript |
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