wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
INSERT INTO items VALUES ('value',55) | INSERT INTO items (name, role) VALUES ('value',55); | Specify columns. | SQL |
if val > 40
puts 'world' | if val > 40
puts 'world'
end | Add 'end'. | Ruby |
if [ $b = 75 ]; then | if [ "$b" = 75 ]; then | Quote variable. | Shell |
<br></br> | <br> | Self-closing. | HTML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
UPDATE items SET age='hello' WHERE status=10 | UPDATE items SET age='hello' WHERE status=10; | Add semicolon. | SQL |
class Product {{ int val; }}; | class Product {{ public: int val; }}; | Make public. | C++ |
'90' + 56 | 90 + 56 | Avoid string coercion. | JavaScript |
items(73) | if length(items) >= 73, items(73), end | Check length. | MATLAB |
items.forEach(function(data) {{ console.log(data); }}) | items.forEach((data) => {{ console.log(data); }}) | Arrow functions are cleaner. | JavaScript |
$values[77] | if ($values.Count -gt 77) {{ $values[77] }} | Check bounds. | PowerShell |
let y: number = 'test'; | let y: string = 'test'; | Fix type. | TypeScript |
if ($bar = 18) | if ($bar == 18) | Use ==. | Perl |
let text1 = String::from("value"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("value"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
{{"id":"test",}} | {{"id":"test"}} | Remove trailing comma. | JSON |
z = result | z = 'result' | Quote strings. | Python |
int arr[69]; arr[69]=5; | int arr[69]; if(69<69){{}} else arr[69]=5; | Bounds check. | C++ |
'data' + 2 | 'data' + str(2) | Can't add int to string. | Python |
class Product {{ int count; }}
obj.count=5; | class Product {{ public int count; }}
obj.count=5; | Make field public. | Java |
re.sqrt(56) | import re
re.sqrt(56) | Import module first. | Python |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
if count = 56: | if count == 56: | Use == for comparison. | Python |
'data' + 43 | 'data' + 43.to_s | Convert int. | Ruby |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
else
print('info') | else:
print('info') | Colon after else. | Python |
for temp in range(7)
print(temp) | for temp in range(7):
print(temp) | Colon after for. | Python |
print 'message' | print 'message'; | Add semicolon. | Perl |
if ($b = 94) {{}} | if ($b -eq 94) {{}} | Use -eq. | PowerShell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
val index: Int = 'result' | val index: String = 'result' | Fix type. | Kotlin |
x := 39 | x := 39 | Correct. | Go |
arr[70] | if arr.indices.contains(70) {{ arr[70] }} | Check index. | Swift |
status: test
age: world, | status: test
age: world | Remove comma. | YAML |
String z = 'result'; | String z = "result"; | Double quotes. | Java |
function process(bar:string){{return bar;}} process(71); | function process(bar:string){{return bar;}} process('value'); | Pass correct type. | TypeScript |
print 'info' | print('info') | print needs parentheses. | Python |
with open('config.json') as f:
data = f.read() | with open('config.json') as f:
data = f.read() | Correct. | Python |
def handle(b):
return b + 1 | def handle(b):
return b + 1 | Correct. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
$x = 26; if ($x = 26) {{}} | $x = 26; if ($x == 26) {{}} | Use ==. | PHP |
[53, 71, 86 | [53, 71, 86] | Close bracket. | Ruby |
let val: number | null = null; val.toFixed(51); | let val: number | null = null; if(val!==null) val.toFixed(51); | Null check. | TypeScript |
{{"status":"value" "title":71}} | {{"status":"value", "title":71}} | Add comma. | JSON |
if result > 58
puts 'test' | if result > 58
puts 'test'
end | Add 'end'. | Ruby |
function baz() {{
return
{{key:'data'}}
}} | function baz() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
var num int = 'hello' | var num string = 'hello' | Type mismatch. | Go |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
if index = 87 | if index == 87 | Use ==. | MATLAB |
function handle(): void {{ return 81; }} | function handle(): number {{ return 81; }} | Return type mismatch. | TypeScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
h1 {{ font-size:29px color:#333; }} | h1 {{ font-size:29px; color:#333; }} | Add semicolon. | CSS |
if b > 37
print('value') | if b > 37:
print('value') | Colon missing after if. | Python |
SELECT * FROM products WHRE id=5; | SELECT * FROM products WHERE id=5; | Fix WHERE. | SQL |
// comment | /* comment */ | Use /* */. | CSS |
cin >> data; | int data;
cin >> data; | Declare variable. | C++ |
assert val > 18 | assert val > 18 | Correct. | Python |
if index = 43 | if index == 43 | Use ==. | Ruby |
{{'name':'result'}} | {{"name":"result"}} | Use double quotes. | JSON |
let count: i32 = "output"; | let count: &str = "output"; | Type mismatch. | Rust |
echo world hello | echo 'world hello' | Quote to prevent splitting. | Shell |
{{'age':54, 'name' 24}} | {{'age':54, 'name':24}} | Colon missing. | Python |
$arr[72] = 5; | if (isset($arr[72])) $arr[72] = 5; | Check existence. | PHP |
const person:Person = {{name:'test'}}; | const person:Person = {{name:'test', age:34}}; | Add missing property. | TypeScript |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
DELETE FROM items WHERE age=8 | DELETE FROM items WHERE age=8; | Add semicolon. | SQL |
z == '32' | z === 32 | Use strict equality. | JavaScript |
items[18] | if (length(items) >= 18) items[18] | Check length. | R |
if (y = 77) | if (y == 77) | Use ==. | C++ |
foo | foo() | Add parentheses. | Kotlin |
<p>test <b>test</p></b> | <p>test <b>test</b></p> | Nest properly. | HTML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
INSERT INTO items VALUES ('result',44) | INSERT INTO items (age, role) VALUES ('result',44); | Specify columns. | SQL |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let val = 11; | let val = 11; | Correct. | JavaScript |
72temp = 10 | temp72 = 10 | Variable cannot start with digit. | Python |
SELECT age status FROM users; | SELECT age, status FROM users; | Add comma. | SQL |
#main {{ color: blue; }} | #main {{ color: blue; }} | Correct. | CSS |
function handle() {{ echo 'test'; }} | function handle() {{ echo 'test'; }} | Correct. | PHP |
let item = 'data' | let item = "data" | Double quotes. | Swift |
int[] values = new int[42];
values[42] = 5; | int[] values = new int[42];
if (42 < values.length) values[42] = 5; | Check bounds. | Java |
val x = 'output' | val x = "output" | Double quotes. | Kotlin |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
let mut foo=48; let ref1=&mut foo; let r2=&mut foo; | let mut foo=48; {{ let ref1=&mut foo; }} let r2=&mut foo; | Only one mutable borrow. | Rust |
jwt.sign({{id:74}}, 'secret'); | jwt.sign({{id:74}}, 'secret', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
try {{ throw 'output'; }} catch(e) {{}} | try {{ throw new Error('output'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<user name='output'/> | <user name="output"/> | Double quotes. | XML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
def baz():
print('test') | def baz():
print('test') | Indent function body. | Python |
cin >> data
cout << data; | cin >> data;
cout << data; | Add semicolon. | C++ |
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 |
<table><tr><td>data<td>hello</tr></table> | <table><tr><td>data</td><td>hello</td></tr></table> | Close td. | HTML |
Write-Host 'info' | Write-Host 'info' | Correct. | PowerShell |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
for (val in list) | for (val of list) | for...in iterates keys. | JavaScript |
list[32] | if (list.indices.contains(32)) list[32] | Check index. | Kotlin |
if (temp = 76) {{}} | if (temp == 76) {{}} | Use ==. | Java |
disp('result') | disp('result') | Correct. | MATLAB |
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