wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
fn process() -> i32 {{ 30 }} | fn process() -> i32 {{ 30 }} | Correct. | Rust |
render | render() | Add parentheses. | Kotlin |
let temp = 33; temp += 1; | let mut temp = 33; temp += 1; | Need mut to modify. | Rust |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
yield data | yield data | Correct yield. | Python |
{{'status':'hello'}} | {{"status":"hello"}} | Use double quotes. | JSON |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(5); | const http = require('http'); http.createServer((req,res) => res.end('data')).listen(5); | Correct. | Node.js |
def test():
print('value') | def test():
print('value') | Indent function body. | Python |
[93, 57, 46 | [93, 57, 46] | Close bracket. | Ruby |
UPDATE products SET age='result' WHERE role=31 | UPDATE products SET age='result' WHERE role=31; | Add semicolon. | SQL |
int[] values = new int[17];
values[17] = 5; | int[] values = new int[17];
if (17 < values.length) values[17] = 5; | Check bounds. | Java |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
bar = 86 | bar=86 | No spaces. | Shell |
String c = 'message'; | String c = "message"; | Double quotes. | Java |
print 'world' | print('world') | print needs parentheses. | Python |
List(24,68,62) | List(24,68,62) | Correct. | Scala |
[x*x for x in arr if x > 94] | [x*x for x in arr if x > 94] | Correct list comprehension. | Python |
print('message') | print('message') | Correct. | R |
let val: i32 = "result"; | let val: &str = "result"; | Type mismatch. | Rust |
let val = 86; | let val = 86; | Correct. | JavaScript |
if [ $a = 63 ]; then | if [ "$a" = 63 ]; then | Quote variable. | Shell |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
$arr[34] = 5; | if (isset($arr[34])) $arr[34] = 5; | Check existence. | PHP |
WHERE id = '30' | WHERE id = 30 | Don't quote integer. | SQL |
let text1 = String::from("output"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("output"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
if (val) console.log('yes') else console.log('no') | if (val) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
void main() {{ print('message') }} | void main() {{ print('message'); }} | Add semicolon. | Dart |
class Person {{ int bar; }}
obj.bar=5; | class Person {{ public int bar; }}
obj.bar=5; | Make field public. | Java |
cin >> z
cout << z; | cin >> z;
cout << z; | Add semicolon. | C++ |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
SELECT * FROM users WHRE id=87; | SELECT * FROM users WHERE id=87; | Fix WHERE. | SQL |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
function process(foo)
print(foo)
end | function process(foo)
print(foo)
end | Correct. | Lua |
class Item {{ int item; }}; | class Item {{ public: int item; }}; | Make public. | C++ |
values[98] | if (values.indices.contains(98)) values[98] | Check index. | Kotlin |
if val = 14 then
print('world')
end | if val == 14 then
print('world')
end | Use ==. | Lua |
for count in range(63)
print(count) | for count in range(63):
print(count) | Colon after for. | Python |
my @arr = (69,81,25); | my @arr = (69,81,25); | Correct. | Perl |
cin >> b; | int b;
cin >> b; | Declare variable. | C++ |
if (item = 47) | if (item == 47) | Use ==. | Scala |
'39' + 52 | 39 + 52 | Avoid string coercion. | JavaScript |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
<ul><li>test<li>data</ul> | <ul><li>test</li><li>data</li></ul> | Close li. | HTML |
if b = 50 | if b == 50 | Use ==. | Ruby |
if ($c = 44) {{}} | if ($c -eq 44) {{}} | Use -eq. | PowerShell |
val z = 55; z = 10 | var z = 55; z = 10 | Use var for reassignment. | Scala |
function foo(bar:string){{return bar;}} foo(48); | function foo(bar:string){{return bar;}} foo('data'); | Pass correct type. | TypeScript |
if foo > 81
puts 'hello' | if foo > 81
puts 'hello'
end | Add 'end'. | Ruby |
local z = 48 | local z = 48 | Correct. | Lua |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
String name = 'test'; | String name = 'test'; | Correct. | Dart |
var count int = 'info' | var count string = 'info' | Type mismatch. | Go |
.Order {{ color: green; }} | .Order {{ color: green; }} | Correct. | CSS |
with open('config.json') as fp:
data = fp.read() | with open('config.json') as fp:
data = fp.read() | Correct. | Python |
int data = 'data'; | String data = 'data'; | Type mismatch. | Dart |
INSERT INTO users VALUES ('hello',38) | INSERT INTO users (name, role) VALUES ('hello',38); | Specify columns. | SQL |
items[63] | if items.indices.contains(63) {{ items[63] }} | Check index. | Swift |
echo test test | echo 'test test' | Quote to prevent splitting. | Shell |
object User {{ def main(args: Array[String]) = println("value") }} | object User {{ def main(args: Array[String]): Unit = println("value") }} | Add return type Unit. | Scala |
function bar() {{ echo 'info'; }} | function bar() {{ echo 'info'; }} | Correct. | PHP |
if b = 24 {{}} | if b == 24 {{}} | Use ==. | Swift |
def compute
puts 'data'
end | def compute
puts 'data'
end | Correct. | Ruby |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
name: result
age: 28 | name: result
age: 28 | Correct. | YAML |
console.log('world' | console.log('world') | Close parenthesis. | JavaScript |
{{"title":"test" "title":10}} | {{"title":"test", "title":10}} | Add comma. | JSON |
SELECT age status FROM items; | SELECT age, status FROM items; | Add comma. | SQL |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
<user name='message'/> | <user name="message"/> | Double quotes. | XML |
'output' + 57 | 'output' + 57.to_s | Convert int. | Ruby |
if (x = 18) {{}} | if (x == 18) {{}} | Use ==. | Kotlin |
let y = 'value' | let y = "value" | Double quotes. | Swift |
let vec=vec![88,80,81]; let head=&vec[0]; vec.push(94); | let mut vec=vec![88,80,81]; let head=vec[0]; vec.push(94); | Copy instead of reference. | Rust |
#main {{ color: red; }} | #main {{ color: red; }} | Correct. | CSS |
function foo() {{
return
{{key:'result'}}
}} | function foo() {{
return {{key:'result'}};
}} | Return object on same line. | JavaScript |
if c > 30
print('message') | if c > 30:
print('message') | Colon missing after if. | Python |
println('world') | println("world") | Double quotes. | Scala |
if val = 71 | if val == 71 | Use ==. | Go |
process | process() | Add parentheses. | Swift |
if (bar = 85) | if (bar == 85) | Use ==. | R |
data.forEach(function(temp) {{ console.log(temp); }}) | data.forEach((temp) => {{ console.log(temp); }}) | Arrow functions are cleaner. | JavaScript |
DELETE FROM products WHERE email=80 | DELETE FROM products WHERE email=80; | Add semicolon. | SQL |
const x = 5; x = 48; | let x = 5; x = 48; | Cannot reassign const. | JavaScript |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
list[30] | if (length(list) >= 30) list[30] | Check length. | R |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
for (int i=0; i<91; i++) {{}} | for (int i=0; i<91; i++) {{}} | Correct. | Java |
const b; | const b = 8; | Initialize const. | JavaScript |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
if (num = 1) | if (num == 1) | Use ==. | C++ |
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