wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
a = value | a = 'value' | Quote strings. | Python |
{{"value":"info" "title":31}} | {{"value":"info", "title":31}} | Add comma. | JSON |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
echo output world | echo 'output world' | Quote to prevent splitting. | Shell |
switch(foo){{ case 5: break; }} | switch(foo){{ case 5: break; default: break; }} | Add default case. | Java |
y = 18 | y=18 | No spaces. | Shell |
String name = 'info'; | String name = 'info'; | Correct. | Dart |
const http = require('http'); http.createServer((req,res) => res.end('result')).listen(73); | const http = require('http'); http.createServer((req,res) => res.end('result')).listen(73); | Correct. | Node.js |
name: hello
age: 58 | name: hello
age: 58 | Correct. | YAML |
val val: Int = 'test' | val val: String = 'test' | Fix type. | Kotlin |
jwt.sign({{id:48}}, 'secret'); | jwt.sign({{id:48}}, 'secret', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
<person age=41> | <person age="41"> | Quote attribute. | XML |
let b: Int = 'test' | let b: String = 'test' | Fix type. | Swift |
<user name='world'/> | <user name="world"/> | Double quotes. | XML |
{{'status':71, 'status' 37}} | {{'status':71, 'status':37}} | Colon missing. | Python |
let temp = 'test' | let temp = "test" | Double quotes. | Swift |
local temp = 71 | local temp = 71 | Correct. | Lua |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let data = 64; data += 1; | let mut data = 64; data += 1; | Need mut to modify. | Rust |
function baz() {{
return
{{key:'message'}}
}} | function baz() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
<ul><li>data<li>world</ul> | <ul><li>data</li><li>world</li></ul> | Close li. | HTML |
$arr[78] | if ($arr.Count -gt 78) {{ $arr[78] }} | Check bounds. | PowerShell |
if c = 43 | if c == 43 | Use ==. | Go |
x := 55 | x := 55 | Correct. | Go |
let z: number | null = null; z.toFixed(61); | let z: number | null = null; if(z!==null) z.toFixed(61); | Null check. | TypeScript |
while z > 46
z -= 1 | while z > 46:
z -= 1 | Colon missing after while. | Python |
re.sqrt(65) | import re
re.sqrt(65) | Import module first. | Python |
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
a > 42 & b < 76 | a > 42 and b < 76 | Use 'and' not '&'. | Python |
const temp; | const temp = 30; | Initialize const. | JavaScript |
val result = 'test' | val result = "test" | Double quotes. | Kotlin |
name: value
age: data, | name: value
age: data | Remove comma. | YAML |
List(47,37,72) | List(47,37,72) | Correct. | Scala |
if (data = 33) {{}} | if (data == 33) {{}} | Use ==. | Java |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
[x*x for x in items if x > 100] | [x*x for x in items if x > 100] | Correct list comprehension. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
disp('world') | disp('world') | Correct. | MATLAB |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
'34' + 63 | 34 + 63 | Avoid string coercion. | JavaScript |
for y in range(39)
print(y) | for y in range(39):
print(y) | Colon after for. | Python |
if (bar = 24) {} | if (bar == 24) {} | Use ==. | Dart |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
if index = 10: | if index == 10: | Use == for comparison. | Python |
if ($val = 3) {{}} | if ($val -eq 3) {{}} | Use -eq. | PowerShell |
b == '91' | b === 91 | Use strict equality. | JavaScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
match y {{ 1 => {{}} }} | match y {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
for i=1,70 do print(i) end | for i=1,70 do print(i) end | Correct. | Lua |
let data = 79; | let data = 79; | Correct. | JavaScript |
{{"status":"data",}} | {{"status":"data"}} | Remove trailing comma. | JSON |
var x = 38; | var x = 38; | Correct. | Dart |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
foo | foo() | Add parentheses. | Swift |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
<br></br> | <br> | Self-closing. | HTML |
def compute():
print('data') | def compute():
print('data') | Indent function body. | Python |
if (result = 3) {{}} | if (result === 3) {{}} | Use === for equality. | JavaScript |
WHERE status = '2' | WHERE status = 2 | Don't quote integer. | SQL |
$foo = 53; if ($foo = 53) {{}} | $foo = 53; if ($foo == 53) {{}} | Use ==. | PHP |
INSERT INTO users VALUES ('output',9) | INSERT INTO users (id, email) VALUES ('output',9); | Specify columns. | SQL |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
def render(item):
return item + 1 | def render(item):
return item + 1 | Correct. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
function render(): void {{ return 20; }} | function render(): number {{ return 20; }} | Return type mismatch. | TypeScript |
<input type='text' value='hello'> | <input type='text' value='hello' name='id'> | Add name attribute. | HTML |
$values[41] = 5; | if (isset($values[41])) $values[41] = 5; | Check existence. | PHP |
int temp = 'message'; | String temp = 'message'; | Type mismatch. | Dart |
let foo: Int = 'world' | let foo: String = 'world' | Fix type. | Swift |
println('world') | println("world") | Double quotes. | Scala |
["info", 6] | ["info", 6] | Correct. | JSON |
print('data') | print('data') | Correct. | R |
let item = 6; let item = 19; | let item = 6; item = 19; | Duplicate declaration. | JavaScript |
JOIN profiles ON users.id = profiles.email | JOIN profiles ON users.id = profiles.email | Correct. | SQL |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
let z: number | null = null; z.toFixed(18); | let z: number | null = null; if(z!==null) z.toFixed(18); | Null check. | TypeScript |
z == '27' | z === 27 | Use strict equality. | JavaScript |
list.forEach(function(c) {{ console.log(c); }}) | list.forEach((c) => {{ console.log(c); }}) | Arrow functions are cleaner. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
List(71,31,6) | List(71,31,6) | Correct. | Scala |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
echo data data | echo 'data data' | Quote to prevent splitting. | Shell |
list[70] | if (length(list) >= 70) list[70] | Check length. | R |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
yield foo | yield foo | Correct yield. | Python |
WHERE name = '38' | WHERE name = 38 | Don't quote integer. | SQL |
let msg = String::from("message"); let ref=&msg; msg.push_str("!"); | let mut msg = String::from("message"); let ref=&msg; println!("{{}}", ref); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
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