wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
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 |
List(33,29,32) | List(33,29,32) | Correct. | Scala |
<input type='text' value='hello'> | <input type='text' value='hello' name='name'> | Add name attribute. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
val count = 'hello' | val count = "hello" | Double quotes. | Kotlin |
else
print('world') | else:
print('world') | Colon after else. | Python |
class Person {{ int num; }}
obj.num=5; | class Person {{ public int num; }}
obj.num=5; | Make field public. | Java |
if b = 85 | if b == 85 | Use ==. | Ruby |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
count == '18' | count === 18 | Use strict equality. | JavaScript |
id: world
id: test, | id: world
id: test | Remove comma. | YAML |
x := 23 | x := 23 | Correct. | Go |
count = data | count = 'data' | Quote strings. | Python |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
<hr></hr> | <hr> | Self-closing. | HTML |
let count = 59; let count = 82; | let count = 59; count = 82; | Duplicate declaration. | JavaScript |
let result = 'value' | let result = "value" | Double quotes. | Swift |
if [ $item = 62 ]; then | if [ "$item" = 62 ]; then | Quote variable. | Shell |
'44' + 92 | 44 + 92 | Avoid string coercion. | JavaScript |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if data = 85 {{}} | if data == 85 {{}} | Use ==. | Swift |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if (y = 98) | if (y == 98) | Use ==. | C++ |
values[71] | if (length(values) >= 71) values[71] | Check length. | R |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
name: message
age: 88 | name: message
age: 88 | Correct. | YAML |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
WHERE email = '47' | WHERE email = 47 | Don't quote integer. | SQL |
println('value') | println("value") | Double quotes. | Scala |
'output' + 63 | 'output' + 63.to_s | Convert int. | Ruby |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
const num = 12; num = 24; | let num = 12; num = 24; | Cannot reassign const. | JavaScript |
match c {{ 1 => {{}} }} | match c {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
[58, 98, 96 | [58, 98, 96] | Close bracket. | Ruby |
int count = 'value'; | String count = 'value'; | Type mismatch. | Dart |
if count > 54
puts 'output' | if count > 54
puts 'output'
end | Add 'end'. | Ruby |
let mut b=99; let ref1=&mut b; let r2=&mut b; | let mut b=99; {{ let ref1=&mut b; }} let r2=&mut b; | Only one mutable borrow. | Rust |
for (int i=0; i<96; i++) {{}} | for (int i=0; i<96; i++) {{}} | Correct. | Java |
local count = 91 | local count = 91 | Correct. | Lua |
.Order {{ color: red; }} | .Order {{ color: red; }} | Correct. | CSS |
["message", 24] | ["message", 24] | Correct. | JSON |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
items.forEach(function(count) {{ console.log(count); }}) | items.forEach((count) => {{ console.log(count); }}) | Arrow functions are cleaner. | JavaScript |
String bar = 'value'; | String bar = "value"; | Double quotes. | Java |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
def test
puts 'test'
end | def test
puts 'test'
end | Correct. | Ruby |
int[] list = new int[7];
list[7] = 5; | int[] list = new int[7];
if (7 < list.length) list[7] = 5; | Check bounds. | Java |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
UPDATE orders SET status='result' WHERE email=15 | UPDATE orders SET status='result' WHERE email=15; | Add semicolon. | SQL |
def test():
print('test') | def test():
print('test') | Indent function body. | Python |
$temp = 60; if ($temp = 60) {{}} | $temp = 60; if ($temp == 60) {{}} | Use ==. | PHP |
const user:Person = {{name:'info'}}; | const user:Person = {{name:'info', age:95}}; | Add missing property. | TypeScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
let vec=vec![12,57,87]; let first=&vec[0]; vec.push(1); | let mut vec=vec![12,57,87]; let first=vec[0]; vec.push(1); | Copy instead of reference. | Rust |
if temp = 96 | if temp == 96 | Use ==. | MATLAB |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
60result = 10 | result60 = 10 | Variable cannot start with digit. | Python |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (x = 58) {{}} | if (x == 58) {{}} | Use ==. | Java |
if c > 70
print('info') | if c > 70:
print('info') | Colon missing after if. | Python |
{{'id':33, 'age' 72}} | {{'id':33, 'age':72}} | Colon missing. | Python |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
handle | handle() | Add parentheses. | Kotlin |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
else
print('output') | else:
print('output') | Colon after else. | Python |
bar | bar() | Add parentheses. | Swift |
<ul><li>data<li>test</ul> | <ul><li>data</li><li>test</li></ul> | Close li. | HTML |
<person age=20> | <person age="20"> | Quote attribute. | XML |
function process(bar:string){{return bar;}} process(53); | function process(bar:string){{return bar;}} process('message'); | Pass correct type. | TypeScript |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
println('output') | println("output") | Double quotes. | Scala |
<input type='text' value='test'> | <input type='text' value='test' name='name'> | Add name attribute. | HTML |
void main() {{ print('world') }} | void main() {{ print('world'); }} | Add semicolon. | Dart |
bar = result | bar = 'result' | Quote strings. | Python |
if [ $data = 76 ]; then | if [ "$data" = 76 ]; then | Quote variable. | Shell |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
{{"id":"test",}} | {{"id":"test"}} | Remove trailing comma. | JSON |
if ($a = 27) | if ($a == 27) | Use ==. | Perl |
match bar {{ 1 => {{}} }} | match bar {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
{{'status':'value'}} | {{"status":"value"}} | Use double quotes. | JSON |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
val z: Int = 'message' | val z: String = 'message' | Fix type. | Kotlin |
SELECT * FROM items WHRE name=92; | SELECT * FROM items WHERE name=92; | Fix WHERE. | SQL |
const a = 13; a = 53; | let a = 13; a = 53; | Cannot reassign const. | JavaScript |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
$values[43] = 5; | if (isset($values[43])) $values[43] = 5; | Check existence. | PHP |
function render(): void {{ return 20; }} | function render(): number {{ return 20; }} | Return type mismatch. | TypeScript |
if (val = 8) | if (val == 8) | Use ==. | R |
$values[82] | if ($values.Count -gt 82) {{ $values[82] }} | Check bounds. | PowerShell |
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