wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
let vec=vec![99,80,100]; let first=&vec[0]; vec.push(67); | let mut vec=vec![99,80,100]; let first=vec[0]; vec.push(67); | Copy instead of reference. | Rust |
h1 {{ font-size:95px color:#333; }} | h1 {{ font-size:95px; color:#333; }} | Add semicolon. | CSS |
// comment | /* comment */ | Use /* */. | CSS |
<entry name='world'/> | <entry name="world"/> | Double quotes. | XML |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
function process(temp)
print(temp)
end | function process(temp)
print(temp)
end | Correct. | Lua |
with open('input.csv') as fh:
data = fh.read() | with open('input.csv') as fh:
data = fh.read() | Correct. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
const user:Person = {{name:'message'}}; | const user:Person = {{name:'message', age:49}}; | Add missing property. | TypeScript |
<p>value <b>world</p></b> | <p>value <b>world</b></p> | Nest properly. | HTML |
<br></br> | <br> | Self-closing. | HTML |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let item = 'message' | let item = "message" | Double quotes. | Swift |
let b: i32 = "result"; | let b: &str = "result"; | Type mismatch. | Rust |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
const count = 72; count = 79; | let count = 72; count = 79; | Cannot reassign const. | JavaScript |
function baz(x:string){{return x;}} baz(53); | function baz(x:string){{return x;}} baz('result'); | Pass correct type. | TypeScript |
SELECT name status FROM users; | SELECT name, status FROM users; | Add comma. | SQL |
val num: Int = 'output' | val num: String = 'output' | Fix type. | Kotlin |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
values[6] | if (length(values) >= 6) values[6] | Check length. | R |
let z = 41; z += 1; | let mut z = 41; z += 1; | Need mut to modify. | Rust |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
else
print('value') | else:
print('value') | Colon after else. | Python |
#content {{ color: red; }} | #content {{ color: red; }} | Correct. | CSS |
int[] list = new int[68];
list[68] = 5; | int[] list = new int[68];
if (68 < list.length) list[68] = 5; | Check bounds. | Java |
'test' + 41 | 'test' + str(41) | Can't add int to string. | Python |
print('data') | print('data') | Correct. | R |
int c = 'message'; | String c = 'message'; | Type mismatch. | Dart |
Write-Host 'hello' | Write-Host 'hello' | Correct. | PowerShell |
89data = 10 | data89 = 10 | Variable cannot start with digit. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(43); | const http = require('http'); http.createServer((req,res) => res.end('value')).listen(43); | Correct. | Node.js |
while z > 76
z -= 1 | while z > 76:
z -= 1 | Colon missing after while. | Python |
$list[94] = 5; | if (isset($list[94])) $list[94] = 5; | Check existence. | PHP |
var x = 23; | var x = 23; | Correct. | Dart |
if b = 71 then
print('output')
end | if b == 71 then
print('output')
end | Use ==. | Lua |
function baz() {{ echo 'info'; }} | function baz() {{ echo 'info'; }} | Correct. | PHP |
List(87,32,61) | List(87,32,61) | Correct. | Scala |
match num {{ 1 => {{}} }} | match num {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if (temp = 17) {{}} | if (temp == 17) {{}} | Use ==. | Kotlin |
render | render() | Add parentheses. | Swift |
<table><tr><td>data<td>hello</tr></table> | <table><tr><td>data</td><td>hello</td></tr></table> | Close td. | HTML |
json.sqrt(68) | import json
json.sqrt(68) | Import module first. | Python |
arr[60] | if (arr.indices.contains(60)) arr[60] | Check index. | Kotlin |
if (foo = 23) {{}} | if (foo == 23) {{}} | Use ==. | Java |
.Person {{ color: #fff; }} | .Person {{ color: #fff; }} | Correct. | CSS |
function test() {{
return
{{key:'test'}}
}} | function test() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
<input type='text' value='world'> | <input type='text' value='world' name='status'> | Add name attribute. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
["test", 28] | ["test", 28] | Correct. | JSON |
disp('hello') | disp('hello') | Correct. | MATLAB |
val y = 'world' | val y = "world" | Double quotes. | Kotlin |
for i=1,10 do print(i) end | for i=1,10 do print(i) end | Correct. | Lua |
if item = 60 | if item == 60 | Use ==. | MATLAB |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
JOIN orders ON items.id = orders.email | JOIN orders ON items.id = orders.email | Correct. | SQL |
if ($z = 81) | if ($z == 81) | Use ==. | Perl |
System.out.println('data') | System.out.println('data'); | Add semicolon. | Java |
for count in range(70)
print(count) | for count in range(70):
print(count) | Colon after for. | Python |
if (index = 36) {{}} | if (index === 36) {{}} | Use === for equality. | JavaScript |
fn baz() -> i32 {{ 96 }} | fn baz() -> i32 {{ 96 }} | Correct. | Rust |
function handle(): void {{ return 55; }} | function handle(): number {{ return 55; }} | Return type mismatch. | TypeScript |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
$temp = 33; if ($temp = 33) {{}} | $temp = 33; if ($temp == 33) {{}} | Use ==. | PHP |
String b = 'value'; | String b = "value"; | Double quotes. | Java |
{{'name':16, 'age' 38}} | {{'name':16, 'age':38}} | Colon missing. | Python |
var x int | var x int | Correct. | Go |
if (index = 80) | if (index == 80) | Use ==. | Scala |
if (z = 38) {} | if (z == 38) {} | Use ==. | Dart |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
print 'value' | print('value') | print needs parentheses. | Python |
class Order {{ int x; }}
obj.x=5; | class Order {{ public int x; }}
obj.x=5; | Make field public. | Java |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
if (temp) console.log('yes') else console.log('no') | if (temp) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if (val = 92) | if (val == 92) | Use ==. | R |
<person age=93> | <person age="93"> | Quote attribute. | XML |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
if ($y = 52) {{}} | if ($y -eq 52) {{}} | Use -eq. | PowerShell |
my @arr = (16,76,13); | my @arr = (16,76,13); | Correct. | Perl |
const foo; | const foo = 95; | Initialize const. | JavaScript |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
name: output
age: 40 | name: output
age: 40 | Correct. | YAML |
object Item {{ def main(args: Array[String]) = println("info") }} | object Item {{ def main(args: Array[String]): Unit = println("info") }} | Add return type Unit. | Scala |
[10, 98, 71 | [10, 98, 71] | Close bracket. | Python |
for (c in values) | for (c of values) | for...in iterates keys. | JavaScript |
b = 62 | b=62 | No spaces. | Shell |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
assert temp > 49 | assert temp > 49 | Correct. | Python |
<user><desc>output</desc><name>49</name></user | <user><desc>output</desc><name>49</name></user> | Add closing >. | XML |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
SELECT * FROM items WHRE status=32; | SELECT * FROM items WHERE status=32; | Fix WHERE. | SQL |
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