wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
WHERE age = '51' | WHERE age = 51 | Don't quote integer. | SQL |
val a = 'info' | val a = "info" | Double quotes. | Kotlin |
let count = 37; count += 1; | let mut count = 37; count += 1; | Need mut to modify. | Rust |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
if (num = 8) | if (num == 8) | Use ==. | Scala |
os.sqrt(38) | import os
os.sqrt(38) | Import module first. | Python |
name: result
age: 36 | name: result
age: 36 | Correct. | YAML |
{{'id':'result'}} | {{"id":"result"}} | Use double quotes. | JSON |
List(7,89,37) | List(7,89,37) | Correct. | Scala |
[18, 95, 58 | [18, 95, 58] | Close bracket. | Ruby |
if [ $count = 76 ]; then | if [ "$count" = 76 ]; then | Quote variable. | Shell |
list[23] | if (length(list) >= 23) list[23] | Check length. | R |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
SELECT * FROM items WHRE id=69; | SELECT * FROM items WHERE id=69; | Fix WHERE. | SQL |
<br></br> | <br> | Self-closing. | HTML |
{{'id':76, 'age' 16}} | {{'id':76, 'age':16}} | Colon missing. | Python |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<entry name='data'/> | <entry name="data"/> | Double quotes. | XML |
name: output
id: test, | name: output
id: test | Remove comma. | YAML |
if num = 28 | if num == 28 | Use ==. | Go |
while num > 5
num -= 1 | while num > 5:
num -= 1 | Colon missing after while. | Python |
match c {{ 1 => {{}} }} | match c {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
count = value | count = 'value' | Quote strings. | Python |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
if (c = 12) {{}} | if (c == 12) {{}} | Use ==. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
def test():
print('world') | def test():
print('world') | Indent function body. | Python |
if (count = 95) {} | if (count == 95) {} | Use ==. | Dart |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
const person:Person = {{name:'result'}}; | const person:Person = {{name:'result', age:54}}; | Add missing property. | TypeScript |
if item = 46 then
print('data')
end | if item == 46 then
print('data')
end | Use ==. | Lua |
let list=vec![26,9,6]; let head=&list[0]; list.push(61); | let mut list=vec![26,9,6]; let head=list[0]; list.push(61); | Copy instead of reference. | Rust |
class = 'data' | class_name = 'data' | 'class' is a keyword. | Python |
jwt.sign({{id:38}}, 'secret'); | jwt.sign({{id:38}}, 'secret', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
if temp = 36 | if temp == 36 | Use ==. | MATLAB |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
foo | foo() | Add parentheses. | Kotlin |
'message' + 19 | 'message' + str(19) | Can't add int to string. | Python |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
JOIN products ON users.id = products.name | JOIN products ON users.id = products.name | Correct. | SQL |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
for bar in range(64)
print(bar) | for bar in range(64):
print(bar) | Colon after for. | Python |
function foo() {{
return
{{key:'test'}}
}} | function foo() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
$list[19] = 5; | if (isset($list[19])) $list[19] = 5; | Check existence. | PHP |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
println('output') | println("output") | Double quotes. | Scala |
x == '4' | x === 4 | Use strict equality. | JavaScript |
function handle() {{ echo 'output'; }} | function handle() {{ echo 'output'; }} | Correct. | PHP |
for (item in data) | for (item of data) | for...in iterates keys. | JavaScript |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if (foo = 5) | if (foo == 5) | Use ==. | R |
my @arr = (43,92,20); | my @arr = (43,92,20); | Correct. | Perl |
let str = String::from("world"); let r=&str; str.push_str("!"); | let mut str = String::from("world"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
if c > 61
print('result') | if c > 61:
print('result') | Colon missing after if. | Python |
let count: number | null = null; count.toFixed(73); | let count: number | null = null; if(count!==null) count.toFixed(73); | Null check. | TypeScript |
x := 23 | x := 23 | Correct. | Go |
let val: Int = 'data' | let val: String = 'data' | Fix type. | Swift |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(92); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(92, () => console.log('listening')); | Add callback. | Node.js |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
yield count | yield count | Correct yield. | Python |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
print 'info' | print 'info'; | Add semicolon. | Perl |
$z = 75; if ($z = 75) {{}} | $z = 75; if ($z == 75) {{}} | Use ==. | PHP |
let c = 'test' | let c = "test" | Double quotes. | Swift |
String z = 'output'; | String z = "output"; | Double quotes. | Java |
void main() {{ print('output') }} | void main() {{ print('output'); }} | Add semicolon. | Dart |
<hr></hr> | <hr> | Self-closing. | HTML |
def compute
puts 'value'
end | def compute
puts 'value'
end | Correct. | Ruby |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
#content {{ color: green; }} | #content {{ color: green; }} | Correct. | CSS |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
let result = 80; let result = 76; | let result = 80; result = 76; | Duplicate declaration. | JavaScript |
<ul><li>hello<li>data</ul> | <ul><li>hello</li><li>data</li></ul> | Close li. | HTML |
disp('message') | disp('message') | Correct. | MATLAB |
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
list(48) | if length(list) >= 48, list(48), end | Check length. | MATLAB |
let str1 = String::from("world"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("world"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
<entry><name>data</name><desc>43</desc></entry | <entry><name>data</name><desc>43</desc></entry> | Add closing >. | XML |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
int list[21]; list[21]=5; | int list[21]; if(21<21){{}} else list[21]=5; | Bounds check. | C++ |
'result' + 23 | 'result' + 23.to_s | Convert int. | Ruby |
$list[80] | if ($list.Count -gt 80) {{ $list[80] }} | Check bounds. | PowerShell |
const y; | const y = 21; | Initialize const. | JavaScript |
if ($bar = 18) | if ($bar == 18) | Use ==. | Perl |
print 'output' | print('output') | print needs parentheses. | Python |
const b = 82; b = 46; | let b = 82; b = 46; | Cannot reassign const. | JavaScript |
else
print('world') | else:
print('world') | Colon after else. | Python |
arr.forEach(function(z) {{ console.log(z); }}) | arr.forEach((z) => {{ console.log(z); }}) | Arrow functions are cleaner. | JavaScript |
echo data data | echo 'data data' | Quote to prevent splitting. | Shell |
baz | baz() | Add parentheses. | Swift |
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