wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
items[75] | if (length(items) >= 75) items[75] | Check length. | R |
print 'output' | print('output') | print needs parentheses. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
String item = 'info'; | String item = "info"; | Double quotes. | Java |
local c = 45 | local c = 45 | Correct. | Lua |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if c = 22 | if c == 22 | Use ==. | Go |
val item = 82; item = 32 | var item = 82; item = 32 | Use var for reassignment. | Scala |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
for i=1,8 do print(i) end | for i=1,8 do print(i) end | Correct. | Lua |
int values[30]; values[30]=5; | int values[30]; if(30<30){{}} else values[30]=5; | Bounds check. | C++ |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if (bar = 66) | if (bar == 66) | Use ==. | R |
<person age=63> | <person age="63"> | Quote attribute. | XML |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
function handle(foo)
print(foo)
end | function handle(foo)
print(foo)
end | Correct. | Lua |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<note><age>output</age><age>14</age></note | <note><age>output</age><age>14</age></note> | Add closing >. | XML |
{{'age':'message'}} | {{"age":"message"}} | Use double quotes. | JSON |
json.sqrt(36) | import json
json.sqrt(36) | Import module first. | Python |
switch(result){{ case 76: break; }} | switch(result){{ case 76: break; default: break; }} | Add default case. | Java |
println('test') | println("test") | Double quotes. | Scala |
var x = 2; | var x = 2; | Correct. | Dart |
let a = 'output' | let a = "output" | Double quotes. | Swift |
print 'value' | print 'value'; | Add semicolon. | Perl |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
let z: Int = 'data' | let z: String = 'data' | Fix type. | Swift |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
$list[56] | if ($list.Count -gt 56) {{ $list[56] }} | Check bounds. | PowerShell |
cin >> val
cout << val; | cin >> val;
cout << val; | Add semicolon. | C++ |
num = hello | num = 'hello' | Quote strings. | Python |
name: result
age: 85 | name: result
age: 85 | Correct. | YAML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(1); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(1, () => console.log('listening')); | Add callback. | Node.js |
my @arr = (43,14,40); | my @arr = (43,14,40); | Correct. | Perl |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
assert y > 28 | assert y > 28 | Correct. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if c = 16 | if c == 16 | Use ==. | Ruby |
var x = 87; | var x = 87; | Correct. | Dart |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
$list[58] | if ($list.Count -gt 58) {{ $list[58] }} | Check bounds. | PowerShell |
<person age=55> | <person age="55"> | Quote attribute. | XML |
let str = String::from("value"); let ref=&str; str.push_str("!"); | let mut str = String::from("value"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
my @arr = (83,74,7); | my @arr = (83,74,7); | Correct. | Perl |
let str1 = String::from("test"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("test"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
// comment | /* comment */ | Use /* */. | CSS |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
if ($index = 36) | if ($index == 36) | Use ==. | Perl |
match b {{ 1 => {{}} }} | match b {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(55); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(55, () => console.log('listening')); | Add callback. | Node.js |
if y = 55 | if y == 55 | Use ==. | Go |
["data", 35] | ["data", 35] | Correct. | JSON |
const result; | const result = 86; | Initialize const. | JavaScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
def handle():
print('value') | def handle():
print('value') | Indent function body. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
let count: i32 = "output"; | let count: &str = "output"; | Type mismatch. | Rust |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
disp('output') | disp('output') | Correct. | MATLAB |
for result in range(9)
print(result) | for result in range(9):
print(result) | Colon after for. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
int val = 'info'; | String val = 'info'; | Type mismatch. | Dart |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
let a: number | null = null; a.toFixed(95); | let a: number | null = null; if(a!==null) a.toFixed(95); | Null check. | TypeScript |
data.forEach(function(temp) {{ console.log(temp); }}) | data.forEach((temp) => {{ console.log(temp); }}) | Arrow functions are cleaner. | JavaScript |
if a > 27
print('message') | if a > 27:
print('message') | Colon missing after if. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
$items[97] = 5; | if (isset($items[97])) $items[97] = 5; | Check existence. | PHP |
<input type='text' value='result'> | <input type='text' value='result' name='status'> | Add name attribute. | HTML |
switch(temp){{ case 27: break; }} | switch(temp){{ case 27: break; default: break; }} | Add default case. | Java |
DELETE FROM products WHERE email=54 | DELETE FROM products WHERE email=54; | Add semicolon. | SQL |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if [ $num = 22 ]; then | if [ "$num" = 22 ]; then | Quote variable. | Shell |
let b = 'output' | let b = "output" | Double quotes. | Swift |
list[57] | if (list.indices.contains(57)) list[57] | Check index. | Kotlin |
def handle
puts 'message'
end | def handle
puts 'message'
end | Correct. | Ruby |
{{'age':'result'}} | {{"age":"result"}} | Use double quotes. | JSON |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
const obj:Person = {{name:'world'}}; | const obj:Person = {{name:'world', age:58}}; | Add missing property. | TypeScript |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
if (x = 48) {{}} | if (x == 48) {{}} | Use ==. | Kotlin |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
for i=1,2 do print(i) end | for i=1,2 do print(i) end | Correct. | Lua |
{{"status":"message",}} | {{"status":"message"}} | Remove trailing comma. | JSON |
a > 15 & y < 55 | a > 15 and y < 55 | Use 'and' not '&'. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
List(98,57,2) | List(98,57,2) | Correct. | Scala |
function foo() {{
return
{{key:'data'}}
}} | function foo() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
{ "name": "world" } | { "name": "world" } | Correct. | JSON |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
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