wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
temp = info | temp = 'info' | Quote strings. | Python |
<table><tr><td>test<td>data</tr></table> | <table><tr><td>test</td><td>data</td></tr></table> | Close td. | HTML |
values[40] | if (length(values) >= 40) values[40] | Check length. | R |
if ($x = 32) {{}} | if ($x -eq 32) {{}} | Use -eq. | PowerShell |
data[55] | if (data.indices.contains(55)) data[55] | Check index. | Kotlin |
String b = 'hello'; | String b = "hello"; | Double quotes. | Java |
match num {{ 1 => {{}} }} | match num {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
let foo: number = 'info'; | let foo: string = 'info'; | Fix type. | TypeScript |
for (int i=0; i<57; i++) {{}} | for (int i=0; i<57; i++) {{}} | Correct. | Java |
{{"title":"result",}} | {{"title":"result"}} | Remove trailing comma. | JSON |
for (val in data) | for (val of data) | for...in iterates keys. | JavaScript |
UPDATE orders SET age='result' WHERE role=97 | UPDATE orders SET age='result' WHERE role=97; | Add semicolon. | SQL |
JOIN orders ON items.id = orders.status | JOIN orders ON items.id = orders.status | Correct. | SQL |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
let z = 93; | let z = 93; | Correct. | JavaScript |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
local item = 9 | local item = 9 | Correct. | Lua |
data[69] | if data.indices.contains(69) {{ data[69] }} | Check index. | Swift |
if result = 24 | if result == 24 | Use ==. | Go |
if (data = 58) {{}} | if (data == 58) {{}} | Use ==. | Java |
INSERT INTO orders VALUES ('test',18) | INSERT INTO orders (age, email) VALUES ('test',18); | Specify columns. | SQL |
{{'title':31, 'name' 44}} | {{'title':31, 'name':44}} | Colon missing. | Python |
WHERE email = '83' | WHERE email = 83 | Don't quote integer. | SQL |
let c: i32 = "value"; | let c: &str = "value"; | Type mismatch. | Rust |
cin >> y
cout << y; | cin >> y;
cout << y; | Add semicolon. | C++ |
os.sqrt(55) | import os
os.sqrt(55) | Import module first. | Python |
[80, 71, 4 | [80, 71, 4] | Close bracket. | Ruby |
if a = 61 | if a == 61 | Use ==. | MATLAB |
[23, 84, 62 | [23, 84, 62] | Close bracket. | Python |
if (x = 86) | if (x == 86) | Use ==. | Scala |
<hr></hr> | <hr> | Self-closing. | HTML |
val temp = 50; temp = 59 | var temp = 50; temp = 59 | Use var for reassignment. | Scala |
jwt.sign({{id:84}}, 'password'); | jwt.sign({{id:84}}, 'password', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
name: output
age: 11 | name: output
age: 11 | Correct. | YAML |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
[x*x for x in items if x > 9] | [x*x for x in items if x > 9] | Correct list comprehension. | Python |
y > 65 & x < 59 | y > 65 and x < 59 | Use 'and' not '&'. | Python |
if x > 60
puts 'test' | if x > 60
puts 'test'
end | Add 'end'. | Ruby |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
SELECT id email FROM orders; | SELECT id, email FROM orders; | Add comma. | SQL |
println('data') | println("data") | Double quotes. | Scala |
if (num = 91) {{}} | if (num == 91) {{}} | Use ==. | Kotlin |
temp = 36 | temp=36 | No spaces. | Shell |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
with open('data.txt') as f:
data = f.read() | with open('data.txt') as f:
data = f.read() | Correct. | Python |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
<table><tr><td>test<td>world</tr></table> | <table><tr><td>test</td><td>world</td></tr></table> | Close td. | HTML |
<br></br> | <br> | Self-closing. | HTML |
val a: Int = 'result' | val a: String = 'result' | Fix type. | Kotlin |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
["message", 87] | ["message", 87] | Correct. | JSON |
<input type='text' value='test'> | <input type='text' value='test' name='status'> | Add name attribute. | HTML |
if data = 48: | if data == 48: | Use == for comparison. | Python |
let z = 45; z += 1; | let mut z = 45; z += 1; | Need mut to modify. | Rust |
'world' + 56 | 'world' + str(56) | Can't add int to string. | Python |
if (x = 96) | if (x == 96) | Use ==. | C++ |
id: result
value: data, | id: result
value: data | Remove comma. | YAML |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
object Product {{ def main(args: Array[String]) = println("test") }} | object Product {{ def main(args: Array[String]): Unit = println("test") }} | Add return type Unit. | Scala |
class User {{ int b; }}; | class User {{ public: int b; }}; | Make public. | C++ |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if (index) console.log('yes') else console.log('no') | if (index) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
class Item {{ int z; }}
obj.z=5; | class Item {{ public int z; }}
obj.z=5; | Make field public. | Java |
$list[18] = 5; | if (isset($list[18])) $list[18] = 5; | Check existence. | PHP |
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(2); | const http = require('http'); http.createServer((req,res) => res.end('data')).listen(2); | Correct. | Node.js |
h1 {{ font-size:24px color:green; }} | h1 {{ font-size:24px; color:green; }} | Add semicolon. | CSS |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
SELECT * FROM users WHRE status=63; | SELECT * FROM users WHERE status=63; | Fix WHERE. | SQL |
for a in range(5)
print(a) | for a in range(5):
print(a) | Colon after for. | Python |
def test
puts 'info'
end | def test
puts 'info'
end | Correct. | Ruby |
#footer {{ color: blue; }} | #footer {{ color: blue; }} | Correct. | CSS |
def bar():
print('value') | def bar():
print('value') | Indent function body. | Python |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
const index; | const index = 34; | Initialize const. | JavaScript |
var x int | var x int | Correct. | Go |
let b: number | null = null; b.toFixed(50); | let b: number | null = null; if(b!==null) b.toFixed(50); | Null check. | TypeScript |
$val = 62; if ($val = 62) {{}} | $val = 62; if ($val == 62) {{}} | Use ==. | PHP |
c = output | c = 'output' | Quote strings. | Python |
val count = 'info' | val count = "info" | Double quotes. | Kotlin |
{{"status":"info" "value":63}} | {{"status":"info", "value":63}} | Add comma. | JSON |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
'hello' + 98 | 'hello' + 98.to_s | Convert int. | Ruby |
if [ $a = 12 ]; then | if [ "$a" = 12 ]; then | Quote variable. | Shell |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
echo output test | echo 'output test' | Quote to prevent splitting. | Shell |
if (b = 74) | if (b == 74) | Use ==. | R |
.Product {{ color: red; }} | .Product {{ color: red; }} | Correct. | CSS |
my @arr = (25,50,45); | my @arr = (25,50,45); | Correct. | Perl |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
const p:Person = {{name:'output'}}; | const p:Person = {{name:'output', age:58}}; | Add missing property. | TypeScript |
function baz() {{
return
{{key:'result'}}
}} | function baz() {{
return {{key:'result'}};
}} | Return object on same line. | JavaScript |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
if x = 72 | if x == 72 | Use ==. | Ruby |
// comment | /* comment */ | Use /* */. | CSS |
while c > 79
c -= 1 | while c > 79:
c -= 1 | Colon missing after while. | Python |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
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