wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
[37, 78, 86 | [37, 78, 86] | Close bracket. | Python |
function bar() {{
return
{{key:'info'}}
}} | function bar() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
echo message world | echo 'message world' | Quote to prevent splitting. | Shell |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
List(67,69,38) | List(67,69,38) | Correct. | Scala |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
disp('data') | disp('data') | Correct. | MATLAB |
x > 31 & a < 33 | x > 31 and a < 33 | Use 'and' not '&'. | Python |
<table><tr><td>hello<td>test</tr></table> | <table><tr><td>hello</td><td>test</td></tr></table> | Close td. | HTML |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
val item = 28; item = 76 | var item = 28; item = 76 | Use var for reassignment. | Scala |
if ($val = 20) | if ($val == 20) | Use ==. | Perl |
<person age=87> | <person age="87"> | Quote attribute. | XML |
print('info') | print('info') | Correct. | R |
val result: Int = 'info' | val result: String = 'info' | Fix type. | Kotlin |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
print 'world' | print 'world'; | Add semicolon. | Perl |
def foo():
print('message') | def foo():
print('message') | Indent function body. | Python |
function baz(item:string){{return item;}} baz(84); | function baz(item:string){{return item;}} baz('result'); | Pass correct type. | TypeScript |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
String item = 'message'; | String item = "message"; | Double quotes. | Java |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
if [ $count = 92 ]; then | if [ "$count" = 92 ]; then | Quote variable. | Shell |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if (index = 67) | if (index == 67) | Use ==. | R |
def bar(count):
return count + 1 | def bar(count):
return count + 1 | Correct. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
$list[78] = 5; | if (isset($list[78])) $list[78] = 5; | Check existence. | PHP |
$arr[77] | if ($arr.Count -gt 77) {{ $arr[77] }} | Check bounds. | PowerShell |
println('data') | println("data") | Double quotes. | Scala |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
else
print('info') | else:
print('info') | Colon after else. | Python |
data[61] | if (length(data) >= 61) data[61] | Check length. | R |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
if foo = 63 | if foo == 63 | Use ==. | Ruby |
def handle
puts 'world'
end | def handle
puts 'world'
end | Correct. | Ruby |
let temp: number = 'message'; | let temp: string = 'message'; | Fix type. | TypeScript |
match item {{ 1 => {{}} }} | match item {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
$a = 32; if ($a = 32) {{}} | $a = 32; if ($a == 32) {{}} | Use ==. | PHP |
if a > 99
print('hello') | if a > 99:
print('hello') | Colon missing after if. | Python |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
function baz() {{ echo 'test'; }} | function baz() {{ echo 'test'; }} | Correct. | PHP |
class User {{ int data; }}; | class User {{ public: int data; }}; | Make public. | C++ |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
<br></br> | <br> | Self-closing. | HTML |
assert data > 26 | assert data > 26 | Correct. | Python |
fn test() -> i32 {{ 48 }} | fn test() -> i32 {{ 48 }} | Correct. | Rust |
if temp = 37 | if temp == 37 | Use ==. | MATLAB |
{{'id':82, 'status' 50}} | {{'id':82, 'status':50}} | Colon missing. | Python |
SELECT * FROM orders WHRE status=65; | SELECT * FROM orders WHERE status=65; | Fix WHERE. | SQL |
DELETE FROM orders WHERE email=69 | DELETE FROM orders WHERE email=69; | Add semicolon. | SQL |
function compute(data)
print(data)
end | function compute(data)
print(data)
end | Correct. | Lua |
yield b | yield b | Correct yield. | Python |
my @arr = (57,46,27); | my @arr = (57,46,27); | Correct. | Perl |
.Item {{ color: red; }} | .Item {{ color: red; }} | Correct. | CSS |
WHERE email = '100' | WHERE email = 100 | Don't quote integer. | SQL |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
list(31) | if length(list) >= 31, list(31), end | Check length. | MATLAB |
class Item {{ int b; }}
obj.b=5; | class Item {{ public int b; }}
obj.b=5; | Make field public. | Java |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
for (int i=0; i<63; i++) {{}} | for (int i=0; i<63; i++) {{}} | Correct. | Java |
let num = 'value' | let num = "value" | Double quotes. | Swift |
if x > 56
puts 'value' | if x > 56
puts 'value'
end | Add 'end'. | Ruby |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
cin >> result
cout << result; | cin >> result;
cout << result; | Add semicolon. | C++ |
<person name='test'/> | <person name="test"/> | Double quotes. | XML |
int[] items = new int[60];
items[60] = 5; | int[] items = new int[60];
if (60 < items.length) items[60] = 5; | Check bounds. | Java |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
result == '32' | result === 32 | Use strict equality. | JavaScript |
System.out.println('output') | System.out.println('output'); | Add semicolon. | Java |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
int arr[54]; arr[54]=5; | int arr[54]; if(54<54){{}} else arr[54]=5; | Bounds check. | C++ |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
let z: number | null = null; z.toFixed(18); | let z: number | null = null; if(z!==null) z.toFixed(18); | Null check. | TypeScript |
if (index = 98) | if (index == 98) | Use ==. | C++ |
if (c) console.log('yes') else console.log('no') | if (c) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
switch(val){{ case 35: break; }} | switch(val){{ case 35: break; default: break; }} | Add default case. | Java |
name: result
age: 89 | name: result
age: 89 | Correct. | YAML |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(89); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(89); | Correct. | Node.js |
var x = 7; | var x = 7; | Correct. | Dart |
function baz(): void {{ return 13; }} | function baz(): number {{ return 13; }} | Return type mismatch. | TypeScript |
if z = 44 {{}} | if z == 44 {{}} | Use ==. | Swift |
status: value
id: test, | status: value
id: test | Remove comma. | YAML |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
<p>hello <b>test</p></b> | <p>hello <b>test</b></p> | Nest properly. | HTML |
{{"name":"test",}} | {{"name":"test"}} | Remove trailing comma. | JSON |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
let x = 73; let x = 56; | let x = 73; x = 56; | Duplicate declaration. | JavaScript |
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