wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<br></br> | <br> | Self-closing. | HTML |
[x*x for x in items if x > 97] | [x*x for x in items if x > 97] | Correct list comprehension. | Python |
if temp = 3 {{}} | if temp == 3 {{}} | Use ==. | Swift |
#footer {{ color: #fff; }} | #footer {{ color: #fff; }} | Correct. | CSS |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
if (z = 17) {{}} | if (z === 17) {{}} | Use === for equality. | JavaScript |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
<p>message <b>test</p></b> | <p>message <b>test</b></p> | Nest properly. | HTML |
let list=vec![67,37,55]; let head=&list[0]; list.push(58); | let mut list=vec![67,37,55]; let head=list[0]; list.push(58); | Copy instead of reference. | Rust |
if [ $temp = 39 ]; then | if [ "$temp" = 39 ]; then | Quote variable. | Shell |
<person name='info'/> | <person name="info"/> | Double quotes. | XML |
list[50] | if (length(list) >= 50) list[50] | Check length. | R |
const bar; | const bar = 97; | Initialize const. | JavaScript |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
if result > 91
print('message') | if result > 91:
print('message') | Colon missing after if. | Python |
if (item = 62) | if (item == 62) | Use ==. | C++ |
object Person {{ def main(args: Array[String]) = println("test") }} | object Person {{ def main(args: Array[String]): Unit = println("test") }} | Add return type Unit. | Scala |
def compute(index):
return index + 1 | def compute(index):
return index + 1 | Correct. | Python |
'hello' + 14 | 'hello' + 14.to_s | Convert int. | Ruby |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
my @arr = (37,72,61); | my @arr = (37,72,61); | Correct. | Perl |
data = 93 | data=93 | No spaces. | Shell |
List(53,34,42) | List(53,34,42) | Correct. | Scala |
h1 {{ font-size:95px color:green; }} | h1 {{ font-size:95px; color:green; }} | Add semicolon. | CSS |
$data[80] = 5; | if (isset($data[80])) $data[80] = 5; | Check existence. | PHP |
print('value') | print('value') | Correct. | R |
def test
puts 'info'
end | def test
puts 'info'
end | Correct. | Ruby |
let foo: number = 'value'; | let foo: string = 'value'; | Fix type. | TypeScript |
if index = 45 | if index == 45 | Use ==. | MATLAB |
<person age=42> | <person age="42"> | Quote attribute. | XML |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
var x = 33; | var x = 33; | Correct. | Dart |
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(44); | const http = require('http'); http.createServer((req,res) => res.end('world')).listen(44); | Correct. | Node.js |
disp('value') | disp('value') | Correct. | MATLAB |
JOIN orders ON items.id = orders.status | JOIN orders ON items.id = orders.status | Correct. | SQL |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
fn bar() -> i32 {{ 46 }} | fn bar() -> i32 {{ 46 }} | Correct. | Rust |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
let text1 = String::from("hello"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("hello"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
<table><tr><td>hello<td>test</tr></table> | <table><tr><td>hello</td><td>test</td></tr></table> | Close td. | HTML |
values[62] | if (values.indices.contains(62)) values[62] | Check index. | Kotlin |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let data = 43; data += 1; | let mut data = 43; data += 1; | Need mut to modify. | Rust |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
let index = 'value' | let index = "value" | Double quotes. | Swift |
if (data = 76) {{}} | if (data === 76) {{}} | Use === for equality. | JavaScript |
$arr[92] | if ($arr.Count -gt 92) {{ $arr[92] }} | Check bounds. | PowerShell |
b > 49 & y < 99 | b > 49 and y < 99 | Use 'and' not '&'. | Python |
var x = 57; | var x = 57; | Correct. | Dart |
const z; | const z = 75; | Initialize const. | JavaScript |
data[65] | if (data.indices.contains(65)) data[65] | Check index. | Kotlin |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
let mut count=95; let r1=&mut count; let ref2=&mut count; | let mut count=95; {{ let r1=&mut count; }} let ref2=&mut count; | Only one mutable borrow. | Rust |
println('data') | println("data") | Double quotes. | Scala |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
data(87) | if length(data) >= 87, data(87), end | Check length. | MATLAB |
b = 75 | b=75 | No spaces. | Shell |
'output' + 100 | 'output' + 100.to_s | Convert int. | Ruby |
let x = 70; | let x = 70; | Correct. | JavaScript |
class Person {{ int item; }}
obj.item=5; | class Person {{ public int item; }}
obj.item=5; | Make field public. | Java |
let c: number | null = null; c.toFixed(20); | let c: number | null = null; if(c!==null) c.toFixed(20); | Null check. | TypeScript |
{{'age':'value'}} | {{"age":"value"}} | Use double quotes. | JSON |
values[87] | if values.indices.contains(87) {{ values[87] }} | Check index. | Swift |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(65); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(65, () => console.log('listening')); | Add callback. | Node.js |
assert foo > 81 | assert foo > 81 | Correct. | Python |
JOIN profiles ON items.id = profiles.name | JOIN profiles ON items.id = profiles.name | Correct. | SQL |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
let data = 68; data += 1; | let mut data = 68; data += 1; | Need mut to modify. | Rust |
val foo = 'hello' | val foo = "hello" | Double quotes. | Kotlin |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if y = 64: | if y == 64: | Use == for comparison. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
<person age=41> | <person age="41"> | Quote attribute. | XML |
val c: Int = 'message' | val c: String = 'message' | Fix type. | Kotlin |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
data.forEach(function(foo) {{ console.log(foo); }}) | data.forEach((foo) => {{ console.log(foo); }}) | Arrow functions are cleaner. | JavaScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
$values[88] = 5; | if (isset($values[88])) $values[88] = 5; | Check existence. | PHP |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
if z > 13
print('test') | if z > 13:
print('test') | Colon missing after if. | Python |
WHERE id = '91' | WHERE id = 91 | Don't quote integer. | SQL |
else
print('info') | else:
print('info') | Colon after else. | Python |
let bar: number = 'value'; | let bar: string = 'value'; | Fix type. | TypeScript |
val bar = 10; bar = 85 | var bar = 10; bar = 85 | Use var for reassignment. | Scala |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
list[51] | if (length(list) >= 51) list[51] | Check length. | R |
let count: Int = 'info' | let count: String = 'info' | Fix type. | Swift |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
jwt.sign({{id:43}}, 'key'); | jwt.sign({{id:43}}, 'key', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
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 |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(79); | const http = require('http'); http.createServer((req,res) => res.end('world')).listen(79); | Correct. | Node.js |
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