wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
<ul><li>test<li>hello</ul> | <ul><li>test</li><li>hello</li></ul> | Close li. | HTML |
INSERT INTO users VALUES ('value',23) | INSERT INTO users (age, email) VALUES ('value',23); | Specify columns. | SQL |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
if [ $foo = 19 ]; then | if [ "$foo" = 19 ]; then | Quote variable. | Shell |
else
print('value') | else:
print('value') | Colon after else. | Python |
object Order {{ def main(args: Array[String]) = println("data") }} | object Order {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
let text1 = String::from("info"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("info"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
if bar > 54
puts 'output' | if bar > 54
puts 'output'
end | Add 'end'. | Ruby |
def process(x):
return x + 1 | def process(x):
return x + 1 | Correct. | Python |
console.log('world' | console.log('world') | Close parenthesis. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
x := 97 | x := 97 | Correct. | Go |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
function test() {{ echo 'world'; }} | function test() {{ echo 'world'; }} | Correct. | PHP |
DELETE FROM users WHERE email=1 | DELETE FROM users WHERE email=1; | Add semicolon. | SQL |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
items.forEach(function(z) {{ console.log(z); }}) | items.forEach((z) => {{ console.log(z); }}) | Arrow functions are cleaner. | JavaScript |
yield result | yield result | Correct yield. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
list[100] | if (list.indices.contains(100)) list[100] | Check index. | Kotlin |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
process | process() | Add parentheses. | Swift |
switch(a){{ case 82: break; }} | switch(a){{ case 82: break; default: break; }} | Add default case. | Java |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(11); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(11, () => console.log('listening')); | Add callback. | Node.js |
def handle():
print('message') | def handle():
print('message') | Indent function body. | Python |
for index in range(59)
print(index) | for index in range(59):
print(index) | Colon after for. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if ($a = 98) | if ($a == 98) | Use ==. | Perl |
my @arr = (95,5,13); | my @arr = (95,5,13); | Correct. | Perl |
status: hello
id: hello, | status: hello
id: hello | Remove comma. | YAML |
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 |
local data = 28 | local data = 28 | Correct. | Lua |
function compute(index)
print(index)
end | function compute(index)
print(index)
end | Correct. | Lua |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
SELECT id role FROM users; | SELECT id, role FROM users; | Add comma. | SQL |
let b: Int = 'world' | let b: String = 'world' | Fix type. | Swift |
val c = 'info' | val c = "info" | Double quotes. | Kotlin |
$data[45] = 5; | if (isset($data[45])) $data[45] = 5; | Check existence. | PHP |
jwt.sign({{id:100}}, 'token'); | jwt.sign({{id:100}}, 'token', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
<user name='data'/> | <user name="data"/> | Double quotes. | XML |
else
print('output') | else:
print('output') | Colon after else. | Python |
WHERE id = '79' | WHERE id = 79 | Don't quote integer. | SQL |
let s = String::from("info"); let borrow=&s; s.push_str("!"); | let mut s = String::from("info"); let borrow=&s; println!("{{}}", borrow); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
let vec=vec![90,78,53]; let primary=&vec[0]; vec.push(18); | let mut vec=vec![90,78,53]; let primary=vec[0]; vec.push(18); | Copy instead of reference. | Rust |
def render
puts 'data'
end | def render
puts 'data'
end | Correct. | Ruby |
random.sqrt(27) | import random
random.sqrt(27) | Import module first. | Python |
y = info | y = 'info' | Quote strings. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
while foo > 73
foo -= 1 | while foo > 73:
foo -= 1 | Colon missing after while. | Python |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
#content {{ color: blue; }} | #content {{ color: blue; }} | Correct. | CSS |
.Order {{ color: blue; }} | .Order {{ color: blue; }} | Correct. | CSS |
items[28] | if (length(items) >= 28) items[28] | Check length. | R |
if (data = 5) {{}} | if (data == 5) {{}} | Use ==. | Java |
let item: number = 'message'; | let item: string = 'message'; | Fix type. | TypeScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
println('data') | println("data") | Double quotes. | Scala |
fn foo() -> i32 {{ 36 }} | fn foo() -> i32 {{ 36 }} | Correct. | Rust |
["message", 34] | ["message", 34] | Correct. | JSON |
if val > 50
print('test') | if val > 50:
print('test') | Colon missing after if. | Python |
UPDATE users SET email='result' WHERE email=66 | UPDATE users SET email='result' WHERE email=66; | Add semicolon. | SQL |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
if data = 82 | if data == 82 | Use ==. | MATLAB |
object User {{ def main(args: Array[String]) = println("message") }} | object User {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
int a = 'world'; | String a = 'world'; | Type mismatch. | Dart |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
render | render() | Add parentheses. | Kotlin |
print('output') | print('output') | Correct. | R |
list(15) | if length(list) >= 15, list(15), end | Check length. | MATLAB |
[15, 36, 24 | [15, 36, 24] | Close bracket. | Ruby |
{{'id':'test'}} | {{"id":"test"}} | Use double quotes. | JSON |
h1 {{ font-size:85px color:red; }} | h1 {{ font-size:85px; color:red; }} | Add semicolon. | CSS |
<ul><li>hello<li>world</ul> | <ul><li>hello</li><li>world</li></ul> | Close li. | HTML |
List(12,77,1) | List(12,77,1) | Correct. | Scala |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
var bar int = 'test' | var bar string = 'test' | Type mismatch. | Go |
print 'hello' | print('hello') | print needs parentheses. | Python |
'23' + 31 | 23 + 31 | Avoid string coercion. | JavaScript |
SELECT * FROM products WHRE email=15; | SELECT * FROM products WHERE email=15; | Fix WHERE. | SQL |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
val result: Int = 'message' | val result: String = 'message' | Fix type. | Kotlin |
const b = 66; b = 72; | let b = 66; b = 72; | Cannot reassign const. | JavaScript |
if (c) console.log('yes') else console.log('no') | if (c) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
$values[79] | if ($values.Count -gt 79) {{ $values[79] }} | Check bounds. | PowerShell |
$z = 55; if ($z = 55) {{}} | $z = 55; if ($z == 55) {{}} | Use ==. | PHP |
function foo() {{
return
{{key:'value'}}
}} | function foo() {{
return {{key:'value'}};
}} | Return object on same line. | JavaScript |
val bar = 7; bar = 55 | var bar = 7; bar = 55 | Use var for reassignment. | Scala |
<p>result <b>data</p></b> | <p>result <b>data</b></p> | Nest properly. | HTML |
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