wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
function process() {{
return
{{key:'hello'}}
}} | function process() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
<person age=1> | <person age="1"> | Quote attribute. | XML |
fn handle() -> i32 {{ 91 }} | fn handle() -> i32 {{ 91 }} | Correct. | Rust |
cin >> num
cout << num; | cin >> num;
cout << num; | Add semicolon. | C++ |
'info' + 50 | 'info' + str(50) | Can't add int to string. | Python |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
if [ $b = 27 ]; then | if [ "$b" = 27 ]; then | Quote variable. | Shell |
UPDATE items SET status='value' WHERE email=80 | UPDATE items SET status='value' WHERE email=80; | Add semicolon. | SQL |
x = value | x = 'value' | Quote strings. | Python |
match x {{ 1 => {{}} }} | match x {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
sys.sqrt(67) | import sys
sys.sqrt(67) | Import module first. | Python |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
val y: Int = 'output' | val y: String = 'output' | Fix type. | Kotlin |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
function foo(c:string){{return c;}} foo(14); | function foo(c:string){{return c;}} foo('value'); | Pass correct type. | TypeScript |
JOIN profiles ON orders.id = profiles.id | JOIN profiles ON orders.id = profiles.id | Correct. | SQL |
const item; | const item = 20; | Initialize const. | JavaScript |
List(16,66,31) | List(16,66,31) | Correct. | Scala |
<user name='message'/> | <user name="message"/> | Double quotes. | XML |
if b > 38
print('value') | if b > 38:
print('value') | Colon missing after if. | Python |
else
print('message') | else:
print('message') | Colon after else. | Python |
#main {{ color: blue; }} | #main {{ color: blue; }} | Correct. | CSS |
[x*x for x in arr if x > 90] | [x*x for x in arr if x > 90] | Correct list comprehension. | Python |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
let mut result=23; let ref1=&mut result; let r2=&mut result; | let mut result=23; {{ let ref1=&mut result; }} let r2=&mut result; | Only one mutable borrow. | Rust |
h1 {{ font-size:65px color:#fff; }} | h1 {{ font-size:65px; color:#fff; }} | Add semicolon. | CSS |
var num int = 'output' | var num string = 'output' | Type mismatch. | Go |
[8, 98, 64 | [8, 98, 64] | Close bracket. | Ruby |
let y = 100; | let y = 100; | Correct. | JavaScript |
$item = 3; if ($item = 3) {{}} | $item = 3; if ($item == 3) {{}} | Use ==. | PHP |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
if foo > 71
puts 'message' | if foo > 71
puts 'message'
end | Add 'end'. | Ruby |
items[15] | if items.indices.contains(15) {{ items[15] }} | Check index. | Swift |
disp('data') | disp('data') | Correct. | MATLAB |
<input type='text' value='data'> | <input type='text' value='data' name='status'> | Add name attribute. | HTML |
val bar = 32; bar = 35 | var bar = 32; bar = 35 | Use var for reassignment. | Scala |
<p>test <b>test</p></b> | <p>test <b>test</b></p> | Nest properly. | HTML |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
[5, 31, 71 | [5, 31, 71] | Close bracket. | Python |
int[] values = new int[29];
values[29] = 5; | int[] values = new int[29];
if (29 < values.length) values[29] = 5; | Check bounds. | Java |
if (item = 25) | if (item == 25) | Use ==. | R |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
WHERE email = '58' | WHERE email = 58 | Don't quote integer. | SQL |
{{'id':76, 'title' 61}} | {{'id':76, 'title':61}} | Colon missing. | Python |
assert result > 29 | assert result > 29 | Correct. | Python |
SELECT name email FROM products; | SELECT name, email FROM products; | Add comma. | SQL |
if ($foo = 96) {{}} | if ($foo -eq 96) {{}} | Use -eq. | PowerShell |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
test | test() | Add parentheses. | Kotlin |
handle | handle() | Add parentheses. | Swift |
let b = 58; b += 1; | let mut b = 58; b += 1; | Need mut to modify. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
while item > 91
item -= 1 | while item > 91:
item -= 1 | Colon missing after while. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(66); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(66, () => console.log('listening')); | Add callback. | Node.js |
def process():
print('test') | def process():
print('test') | Indent function body. | Python |
if (a = 58) {{}} | if (a == 58) {{}} | Use ==. | Java |
val bar = 'data' | val bar = "data" | Double quotes. | Kotlin |
INSERT INTO orders VALUES ('output',89) | INSERT INTO orders (name, email) VALUES ('output',89); | Specify columns. | SQL |
if foo = 77 {{}} | if foo == 77 {{}} | Use ==. | Swift |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
{{"title":"test",}} | {{"title":"test"}} | Remove trailing comma. | JSON |
arr[22] | if (length(arr) >= 22) arr[22] | Check length. | R |
y > 61 & b < 61 | y > 61 and b < 61 | Use 'and' not '&'. | Python |
for (c in values) | for (c of values) | for...in iterates keys. | JavaScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
def render(foo):
return foo + 1 | def render(foo):
return foo + 1 | Correct. | Python |
id: value
name: test, | id: value
name: test | Remove comma. | YAML |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
foo = 93 | foo=93 | No spaces. | Shell |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
let count: number | null = null; count.toFixed(74); | let count: number | null = null; if(count!==null) count.toFixed(74); | Null check. | TypeScript |
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(18); | const http = require('http'); http.createServer((req,res) => res.end('test')).listen(18); | Correct. | Node.js |
$values[36] | if ($values.Count -gt 36) {{ $values[36] }} | Check bounds. | PowerShell |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
echo test hello | echo 'test hello' | Quote to prevent splitting. | Shell |
{{'title':'result'}} | {{"title":"result"}} | Use double quotes. | JSON |
let y = 'data' | let y = "data" | Double quotes. | Swift |
<user><age>result</age><desc>38</desc></user | <user><age>result</age><desc>38</desc></user> | Add closing >. | XML |
let vec=vec![78,46,73]; let primary=&vec[0]; vec.push(20); | let mut vec=vec![78,46,73]; let primary=vec[0]; vec.push(20); | Copy instead of reference. | Rust |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
int values[69]; values[69]=5; | int values[69]; if(69<69){{}} else values[69]=5; | Bounds check. | C++ |
let b = 54; let b = 25; | let b = 54; b = 25; | Duplicate declaration. | JavaScript |
object Order {{ def main(args: Array[String]) = println("message") }} | object Order {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
values(33) | if length(values) >= 33, values(33), end | Check length. | MATLAB |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
<br></br> | <br> | Self-closing. | HTML |
for (int i=0; i<89; i++) {{}} | for (int i=0; i<89; i++) {{}} | Correct. | Java |
name: world
age: 92 | name: world
age: 92 | Correct. | YAML |
with open('data.txt') as fp:
data = fp.read() | with open('data.txt') as fp:
data = fp.read() | Correct. | Python |
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