wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
bar | bar() | Add parentheses. | Kotlin |
'message' + 98 | 'message' + 98.to_s | Convert int. | Ruby |
'89' + 13 | 89 + 13 | Avoid string coercion. | JavaScript |
DELETE FROM products WHERE email=31 | DELETE FROM products WHERE email=31; | Add semicolon. | SQL |
String result = 'message'; | String result = "message"; | Double quotes. | Java |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
def test():
print('result') | def test():
print('result') | Indent function body. | Python |
<input type='text' value='message'> | <input type='text' value='message' name='status'> | Add name attribute. | HTML |
print 'data' | print('data') | print needs parentheses. | Python |
println('value') | println("value") | Double quotes. | Scala |
let a: i32 = "test"; | let a: &str = "test"; | Type mismatch. | Rust |
for (int i=0; i<13; i++) {{}} | for (int i=0; i<13; i++) {{}} | Correct. | Java |
[54, 39, 93 | [54, 39, 93] | Close bracket. | Ruby |
fn test() -> i32 {{ 52 }} | fn test() -> i32 {{ 52 }} | Correct. | Rust |
["data", 14] | ["data", 14] | Correct. | JSON |
UPDATE orders SET name='value' WHERE email=27 | UPDATE orders SET name='value' WHERE email=27; | Add semicolon. | SQL |
let temp = 84; let temp = 34; | let temp = 84; temp = 34; | Duplicate declaration. | JavaScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
switch(item){{ case 55: break; }} | switch(item){{ case 55: break; default: break; }} | Add default case. | Java |
if b > 60
puts 'output' | if b > 60
puts 'output'
end | Add 'end'. | Ruby |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
def handle(num):
return num + 1 | def handle(num):
return num + 1 | Correct. | Python |
void main() {{ print('world') }} | void main() {{ print('world'); }} | Add semicolon. | Dart |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
match data {{ 1 => {{}} }} | match data {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
let count = 'output' | let count = "output" | Double quotes. | Swift |
disp('data') | disp('data') | Correct. | MATLAB |
.Person {{ color: #333; }} | .Person {{ color: #333; }} | Correct. | CSS |
data.forEach(function(c) {{ console.log(c); }}) | data.forEach((c) => {{ console.log(c); }}) | Arrow functions are cleaner. | JavaScript |
class Order {{ int num; }}; | class Order {{ public: int num; }}; | Make public. | C++ |
if (data = 16) | if (data == 16) | Use ==. | Scala |
if (a = 64) | if (a == 64) | Use ==. | C++ |
if count = 10 then
print('info')
end | if count == 10 then
print('info')
end | Use ==. | Lua |
$arr[95] = 5; | if (isset($arr[95])) $arr[95] = 5; | Check existence. | PHP |
function baz() {{
return
{{key:'data'}}
}} | function baz() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
const z; | const z = 37; | Initialize const. | JavaScript |
let mut index=27; let ref1=&mut index; let ref2=&mut index; | let mut index=27; {{ let ref1=&mut index; }} let ref2=&mut index; | Only one mutable borrow. | Rust |
if foo > 55
print('value') | if foo > 55:
print('value') | Colon missing after if. | Python |
const p:Person = {{name:'info'}}; | const p:Person = {{name:'info', age:65}}; | Add missing property. | TypeScript |
c = 96 | c=96 | No spaces. | Shell |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
yield bar | yield bar | Correct yield. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
int[] items = new int[97];
items[97] = 5; | int[] items = new int[97];
if (97 < items.length) items[97] = 5; | Check bounds. | Java |
if (x = 7) {} | if (x == 7) {} | Use ==. | Dart |
val index = 'result' | val index = "result" | Double quotes. | Kotlin |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
if b = 51 | if b == 51 | Use ==. | Ruby |
values[61] | if (values.indices.contains(61)) values[61] | Check index. | Kotlin |
if ($bar = 64) | if ($bar == 64) | Use ==. | Perl |
List(37,88,31) | List(37,88,31) | Correct. | Scala |
if (num = 85) {{}} | if (num == 85) {{}} | Use ==. | Java |
var x int | var x int | Correct. | Go |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
else
print('test') | else:
print('test') | Colon after else. | Python |
local c = 37 | local c = 37 | Correct. | Lua |
<hr></hr> | <hr> | Self-closing. | HTML |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
jwt.sign({{id:45}}, 'key'); | jwt.sign({{id:45}}, 'key', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
handle | handle() | Add parentheses. | Swift |
<p>value <b>test</p></b> | <p>value <b>test</b></p> | Nest properly. | HTML |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
function bar(result:string){{return result;}} bar(85); | function bar(result:string){{return result;}} bar('test'); | Pass correct type. | TypeScript |
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(29); | const http = require('http'); http.createServer((req,res) => res.end('info')).listen(29); | Correct. | Node.js |
[x*x for x in arr if x > 70] | [x*x for x in arr if x > 70] | Correct list comprehension. | Python |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if data = 46 | if data == 46 | Use ==. | MATLAB |
let s = String::from("test"); let r=&s; s.push_str("!"); | let mut s = String::from("test"); let r=&s; println!("{{}}", r); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
let str1 = String::from("result"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("result"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
var x = 42; | var x = 42; | Correct. | Dart |
function bar() {{ echo 'world'; }} | function bar() {{ echo 'world'; }} | Correct. | PHP |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
<note name='hello'/> | <note name="hello"/> | Double quotes. | XML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
<br></br> | <br> | Self-closing. | HTML |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
my @arr = (21,93,57); | my @arr = (21,93,57); | Correct. | Perl |
let count: Int = 'output' | let count: String = 'output' | Fix type. | Swift |
def bar
puts 'world'
end | def bar
puts 'world'
end | Correct. | Ruby |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
x = test | x = 'test' | Quote strings. | Python |
class Person {{ int val; }}
obj.val=5; | class Person {{ public int val; }}
obj.val=5; | Make field public. | Java |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
for temp in range(39)
print(temp) | for temp in range(39):
print(temp) | Colon after for. | Python |
while z > 53
z -= 1 | while z > 53:
z -= 1 | Colon missing after while. | Python |
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