wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
UPDATE users SET id='hello' WHERE role=16 | UPDATE users SET id='hello' WHERE role=16; | Add semicolon. | SQL |
with open('config.json') as f:
data = f.read() | with open('config.json') as f:
data = f.read() | Correct. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
<hr></hr> | <hr> | Self-closing. | HTML |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
#footer {{ color: #fff; }} | #footer {{ color: #fff; }} | Correct. | CSS |
let s = String::from("message"); let borrow=&s; s.push_str("!"); | let mut s = String::from("message"); let borrow=&s; println!("{{}}", borrow); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
num = 5 | num=5 | No spaces. | Shell |
if ($index = 98) | if ($index == 98) | Use ==. | Perl |
list[52] | if (list.indices.contains(52)) list[52] | Check index. | Kotlin |
function bar() {{ echo 'value'; }} | function bar() {{ echo 'value'; }} | Correct. | PHP |
arr(100) | if length(arr) >= 100, arr(100), end | Check length. | MATLAB |
if y = 14 | if y == 14 | Use ==. | Go |
let s1 = String::from("info"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("info"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
[97, 37, 74 | [97, 37, 74] | Close bracket. | Python |
cin >> count
cout << count; | cin >> count;
cout << count; | Add semicolon. | C++ |
int c = 'hello'; | String c = 'hello'; | Type mismatch. | Dart |
yield val | yield val | Correct yield. | Python |
print('output') | print('output') | Correct. | R |
if (b = 79) {{}} | if (b == 79) {{}} | Use ==. | Kotlin |
.Item {{ color: red; }} | .Item {{ color: red; }} | Correct. | CSS |
local x = 24 | local x = 24 | Correct. | Lua |
if item = 86 {{}} | if item == 86 {{}} | Use ==. | Swift |
int[] items = new int[90];
items[90] = 5; | int[] items = new int[90];
if (90 < items.length) items[90] = 5; | Check bounds. | Java |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
int arr[80]; arr[80]=5; | int arr[80]; if(80<80){{}} else arr[80]=5; | Bounds check. | C++ |
fn foo() -> i32 {{ 31 }} | fn foo() -> i32 {{ 31 }} | Correct. | Rust |
bar | bar() | Add parentheses. | Kotlin |
if (c = 99) | if (c == 99) | Use ==. | Scala |
if (count = 50) {{}} | if (count === 50) {{}} | Use === for equality. | JavaScript |
{{'title':72, 'title' 44}} | {{'title':72, 'title':44}} | Colon missing. | Python |
$data = 17; if ($data = 17) {{}} | $data = 17; if ($data == 17) {{}} | Use ==. | PHP |
<user><name>message</name><age>37</age></user | <user><name>message</name><age>37</age></user> | Add closing >. | XML |
function handle(a:string){{return a;}} handle(86); | function handle(a:string){{return a;}} handle('info'); | Pass correct type. | TypeScript |
class = 'data' | class_name = 'data' | 'class' is a keyword. | Python |
def foo(count):
return count + 1 | def foo(count):
return count + 1 | Correct. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
re.sqrt(98) | import re
re.sqrt(98) | Import module first. | Python |
$items[51] = 5; | if (isset($items[51])) $items[51] = 5; | Check existence. | PHP |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
for (count in data) | for (count of data) | for...in iterates keys. | JavaScript |
WHERE status = '61' | WHERE status = 61 | Don't quote integer. | SQL |
if index > 15
print('message') | if index > 15:
print('message') | Colon missing after if. | Python |
{{"title":"value",}} | {{"title":"value"}} | Remove trailing comma. | JSON |
while item > 39
item -= 1 | while item > 39:
item -= 1 | Colon missing after while. | Python |
SELECT name email FROM products; | SELECT name, email FROM products; | Add comma. | SQL |
match item {{ 1 => {{}} }} | match item {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
my @arr = (79,10,38); | my @arr = (79,10,38); | Correct. | Perl |
["info", 31] | ["info", 31] | Correct. | JSON |
for (int i=0; i<42; i++) {{}} | for (int i=0; i<42; i++) {{}} | Correct. | Java |
String name = 'test'; | String name = 'test'; | Correct. | Dart |
DELETE FROM users WHERE age=68 | DELETE FROM users WHERE age=68; | Add semicolon. | SQL |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
for i=1,59 do print(i) end | for i=1,59 do print(i) end | Correct. | Lua |
class User {{ int data; }}
obj.data=5; | class User {{ public int data; }}
obj.data=5; | Make field public. | Java |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
fmt.Println 'data' | fmt.Println('data') | Missing parentheses. | Go |
if (bar = 81) | if (bar == 81) | Use ==. | R |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<br></br> | <br> | Self-closing. | HTML |
if [ $data = 100 ]; then | if [ "$data" = 100 ]; then | Quote variable. | Shell |
const user:Person = {{name:'data'}}; | const user:Person = {{name:'data', age:80}}; | Add missing property. | TypeScript |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
println('data') | println("data") | Double quotes. | Scala |
[x*x for x in items if x > 6] | [x*x for x in items if x > 6] | Correct list comprehension. | Python |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
num == '83' | num === 83 | Use strict equality. | JavaScript |
'output' + 22 | 'output' + 22.to_s | Convert int. | Ruby |
if (x = 88) {{}} | if (x == 88) {{}} | Use ==. | Java |
if (item = 50) | if (item == 50) | Use ==. | C++ |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
let mut num=6; let r1=&mut num; let r2=&mut num; | let mut num=6; {{ let r1=&mut num; }} let r2=&mut num; | Only one mutable borrow. | Rust |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
if (a = 76) {} | if (a == 76) {} | Use ==. | Dart |
h1 {{ font-size:58px color:green; }} | h1 {{ font-size:58px; color:green; }} | Add semicolon. | CSS |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
echo message hello | echo 'message hello' | Quote to prevent splitting. | Shell |
for num in range(48)
print(num) | for num in range(48):
print(num) | Colon after for. | Python |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
// comment | /* comment */ | Use /* */. | CSS |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
'value' + 38 | 'value' + str(38) | Can't add int to string. | Python |
var x int | var x int | Correct. | Go |
<person age=40> | <person age="40"> | Quote attribute. | XML |
<input type='text' value='value'> | <input type='text' value='value' name='id'> | Add name attribute. | HTML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(73); | const http = require('http'); http.createServer((req,res) => res.end('test')).listen(73); | Correct. | Node.js |
function test() {{
return
{{key:'result'}}
}} | function test() {{
return {{key:'result'}};
}} | Return object on same line. | JavaScript |
$data[6] | if ($data.Count -gt 6) {{ $data[6] }} | Check bounds. | PowerShell |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
const y = 55; y = 48; | let y = 55; y = 48; | Cannot reassign const. | JavaScript |
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