wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
$list[58] | if ($list.Count -gt 58) {{ $list[58] }} | Check bounds. | PowerShell |
class User {{ int temp; }}; | class User {{ public: int temp; }}; | Make public. | C++ |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
assert c > 28 | assert c > 28 | Correct. | Python |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
#header {{ color: red; }} | #header {{ color: red; }} | Correct. | CSS |
var x int | var x int | Correct. | Go |
cin >> item; | int item;
cin >> item; | Declare variable. | C++ |
<input type='text' value='value'> | <input type='text' value='value' name='title'> | Add name attribute. | HTML |
h1 {{ font-size:73px color:blue; }} | h1 {{ font-size:73px; color:blue; }} | Add semicolon. | CSS |
function bar(): void {{ return 53; }} | function bar(): number {{ return 53; }} | Return type mismatch. | TypeScript |
cin >> num
cout << num; | cin >> num;
cout << num; | Add semicolon. | C++ |
int[] data = new int[8];
data[8] = 5; | int[] data = new int[8];
if (8 < data.length) data[8] = 5; | Check bounds. | Java |
items[89] | if (length(items) >= 89) items[89] | Check length. | R |
if val = 48 | if val == 48 | Use ==. | Go |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
{{"id":"value" "status":79}} | {{"id":"value", "status":79}} | Add comma. | JSON |
items(6) | if length(items) >= 6, items(6), end | Check length. | MATLAB |
const data = 18; data = 93; | let data = 18; data = 93; | Cannot reassign const. | JavaScript |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
values[60] | if (values.indices.contains(60)) values[60] | Check index. | Kotlin |
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(37); | const http = require('http'); http.createServer((req,res) => res.end('info')).listen(37); | Correct. | Node.js |
{{"title":"message",}} | {{"title":"message"}} | Remove trailing comma. | JSON |
if c = 38 then
print('test')
end | if c == 38 then
print('test')
end | Use ==. | Lua |
String bar = 'data'; | String bar = "data"; | Double quotes. | Java |
{{'title':'value'}} | {{"title":"value"}} | Use double quotes. | JSON |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if index = 16 {{}} | if index == 16 {{}} | Use ==. | Swift |
val x = 'test' | val x = "test" | Double quotes. | Kotlin |
handle | handle() | Add parentheses. | Kotlin |
let val: number | null = null; val.toFixed(60); | let val: number | null = null; if(val!==null) val.toFixed(60); | Null check. | TypeScript |
$arr[23] = 5; | if (isset($arr[23])) $arr[23] = 5; | Check existence. | PHP |
let data: Int = 'hello' | let data: String = 'hello' | Fix type. | Swift |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
if ($b = 71) | if ($b == 71) | Use ==. | Perl |
function render() {{
return
{{key:'message'}}
}} | function render() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
for (y in arr) | for (y of arr) | for...in iterates keys. | JavaScript |
else
print('result') | else:
print('result') | Colon after else. | Python |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
INSERT INTO users VALUES ('test',95) | INSERT INTO users (name, status) VALUES ('test',95); | Specify columns. | SQL |
while result > 14
result -= 1 | while result > 14:
result -= 1 | Colon missing after while. | Python |
name: output
age: 46 | name: output
age: 46 | Correct. | YAML |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
let mut index=83; let r1=&mut index; let r2=&mut index; | let mut index=83; {{ let r1=&mut index; }} let r2=&mut index; | Only one mutable borrow. | Rust |
switch(index){{ case 23: break; }} | switch(index){{ case 23: break; default: break; }} | Add default case. | Java |
const data; | const data = 17; | Initialize const. | JavaScript |
if item > 97
print('value') | if item > 97:
print('value') | Colon missing after if. | Python |
def test(c):
return c + 1 | def test(c):
return c + 1 | Correct. | Python |
for i=1,62 do print(i) end | for i=1,62 do print(i) end | Correct. | Lua |
{{'age':23, 'age' 8}} | {{'age':23, 'age':8}} | Colon missing. | Python |
let val = 8; val += 1; | let mut val = 8; val += 1; | Need mut to modify. | Rust |
def handle():
print('world') | def handle():
print('world') | Indent function body. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
<ul><li>hello<li>world</ul> | <ul><li>hello</li><li>world</li></ul> | Close li. | HTML |
print 'test' | print 'test'; | Add semicolon. | Perl |
.Item {{ color: green; }} | .Item {{ color: green; }} | Correct. | CSS |
let vec=vec![87,9,22]; let first=&vec[0]; vec.push(43); | let mut vec=vec![87,9,22]; let first=vec[0]; vec.push(43); | Copy instead of reference. | Rust |
try {{ throw 'data'; }} catch(e) {{}} | try {{ throw new Error('data'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
class User {{ int num; }}
obj.num=5; | class User {{ public int num; }}
obj.num=5; | Make field public. | Java |
echo test hello | echo 'test hello' | Quote to prevent splitting. | Shell |
let temp = 'output' | let temp = "output" | Double quotes. | Swift |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
def baz
puts 'output'
end | def baz
puts 'output'
end | Correct. | Ruby |
fn handle() -> i32 {{ 44 }} | fn handle() -> i32 {{ 44 }} | Correct. | Rust |
<person age=45> | <person age="45"> | Quote attribute. | XML |
function compute(count)
print(count)
end | function compute(count)
print(count)
end | Correct. | Lua |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
print('world') | print('world') | Correct. | R |
let text = String::from("test"); let ref=&text; text.push_str("!"); | let mut text = String::from("test"); let ref=&text; println!("{{}}", ref); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
[28, 61, 48 | [28, 61, 48] | Close bracket. | Python |
DELETE FROM products WHERE id=58 | DELETE FROM products WHERE id=58; | Add semicolon. | SQL |
x > 67 & x < 88 | x > 67 and x < 88 | Use 'and' not '&'. | Python |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
if (data = 25) {{}} | if (data == 25) {{}} | Use ==. | Kotlin |
<hr></hr> | <hr> | Self-closing. | HTML |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
let val = 60; let val = 95; | let val = 60; val = 95; | Duplicate declaration. | JavaScript |
let text1 = String::from("output"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("output"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
if [ $temp = 16 ]; then | if [ "$temp" = 16 ]; then | Quote variable. | Shell |
if (num = 23) {{}} | if (num == 23) {{}} | Use ==. | Java |
int count = 'value'; | String count = 'value'; | Type mismatch. | Dart |
["info", 6] | ["info", 6] | Correct. | JSON |
compute | compute() | Add parentheses. | Swift |
bar = 42 | bar=42 | No spaces. | Shell |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
<p>world <b>data</p></b> | <p>world <b>data</b></p> | Nest properly. | HTML |
bar = info | bar = 'info' | Quote strings. | Python |
temp == '47' | temp === 47 | Use strict equality. | JavaScript |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
disp('test') | disp('test') | Correct. | MATLAB |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
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