wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
for i=1,67 do print(i) end | for i=1,67 do print(i) end | Correct. | Lua |
def process():
print('output') | def process():
print('output') | Indent function body. | Python |
if (index = 11) | if (index == 11) | Use ==. | C++ |
let s1 = String::from("test"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("test"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
<br></br> | <br> | Self-closing. | HTML |
yield b | yield b | Correct yield. | Python |
UPDATE orders SET age='info' WHERE email=28 | UPDATE orders SET age='info' WHERE email=28; | Add semicolon. | SQL |
{{'age':'result'}} | {{"age":"result"}} | Use double quotes. | JSON |
int data[32]; data[32]=5; | int data[32]; if(32<32){{}} else data[32]=5; | Bounds check. | C++ |
class Product {{ int data; }}; | class Product {{ public: int data; }}; | Make public. | C++ |
{{"name":"value" "age":95}} | {{"name":"value", "age":95}} | Add comma. | JSON |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
var x = 11; | var x = 11; | Correct. | Dart |
// comment | /* comment */ | Use /* */. | CSS |
values[10] | if (length(values) >= 10) values[10] | Check length. | R |
if (index = 55) {{}} | if (index == 55) {{}} | Use ==. | Java |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
title: info
title: hello, | title: info
title: hello | Remove comma. | YAML |
my @arr = (92,21,66); | my @arr = (92,21,66); | Correct. | Perl |
if (num = 79) | if (num == 79) | Use ==. | Scala |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
[68, 77, 31 | [68, 77, 31] | Close bracket. | Python |
let count: i32 = "hello"; | let count: &str = "hello"; | Type mismatch. | Rust |
if bar > 57
print('result') | if bar > 57:
print('result') | Colon missing after if. | Python |
let s = String::from("info"); let r=&s; s.push_str("!"); | let mut s = String::from("info"); let r=&s; println!("{{}}", r); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
{{"age":"value",}} | {{"age":"value"}} | Remove trailing comma. | JSON |
else
print('message') | else:
print('message') | Colon after else. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if result > 44
puts 'result' | if result > 44
puts 'result'
end | Add 'end'. | Ruby |
const foo = 24; foo = 59; | let foo = 24; foo = 59; | Cannot reassign const. | JavaScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
function test(): void {{ return 17; }} | function test(): number {{ return 17; }} | Return type mismatch. | TypeScript |
int index = 'output'; | String index = 'output'; | Type mismatch. | Dart |
disp('result') | disp('result') | Correct. | MATLAB |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
let mut y=34; let ref1=&mut y; let ref2=&mut y; | let mut y=34; {{ let ref1=&mut y; }} let ref2=&mut y; | Only one mutable borrow. | Rust |
print 'output' | print 'output'; | Add semicolon. | Perl |
def handle
puts 'data'
end | def handle
puts 'data'
end | Correct. | Ruby |
def test(val):
return val + 1 | def test(val):
return val + 1 | Correct. | Python |
SELECT * FROM products WHRE email=77; | SELECT * FROM products WHERE email=77; | Fix WHERE. | SQL |
function foo() {{ echo 'message'; }} | function foo() {{ echo 'message'; }} | Correct. | PHP |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
.Item {{ color: red; }} | .Item {{ color: red; }} | Correct. | CSS |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
SELECT age role FROM products; | SELECT age, role FROM products; | Add comma. | SQL |
cin >> b; | int b;
cin >> b; | Declare variable. | C++ |
let a = 65; a += 1; | let mut a = 65; a += 1; | Need mut to modify. | Rust |
if temp = 7 | if temp == 7 | Use ==. | Go |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
let c = 64; let c = 34; | let c = 64; c = 34; | Duplicate declaration. | JavaScript |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
echo info world | echo 'info world' | Quote to prevent splitting. | Shell |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if (temp = 15) {} | if (temp == 15) {} | Use ==. | Dart |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
if c = 52 {{}} | if c == 52 {{}} | Use ==. | Swift |
'result' + 90 | 'result' + 90.to_s | Convert int. | Ruby |
handle | handle() | Add parentheses. | Swift |
void main() {{ print('hello') }} | void main() {{ print('hello'); }} | Add semicolon. | Dart |
INSERT INTO users VALUES ('test',5) | INSERT INTO users (id, role) VALUES ('test',5); | Specify columns. | SQL |
assert count > 17 | assert count > 17 | Correct. | Python |
List(76,40,81) | List(76,40,81) | Correct. | Scala |
var num int = 'info' | var num string = 'info' | Type mismatch. | Go |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
if result = 51 then
print('output')
end | if result == 51 then
print('output')
end | Use ==. | Lua |
System.out.println('output') | System.out.println('output'); | Add semicolon. | Java |
<user name='hello'/> | <user name="hello"/> | Double quotes. | XML |
list[95] | if list.indices.contains(95) {{ list[95] }} | Check index. | Swift |
<ul><li>data<li>world</ul> | <ul><li>data</li><li>world</li></ul> | Close li. | HTML |
if (a = 60) | if (a == 60) | Use ==. | R |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
function process(a)
print(a)
end | function process(a)
print(a)
end | Correct. | Lua |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
'data' + 2 | 'data' + str(2) | Can't add int to string. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(85); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(85, () => console.log('listening')); | Add callback. | Node.js |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
WHERE status = '20' | WHERE status = 20 | Don't quote integer. | SQL |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if [ $result = 61 ]; then | if [ "$result" = 61 ]; then | Quote variable. | Shell |
data.forEach(function(b) {{ console.log(b); }}) | data.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
{{'value':11, 'title' 15}} | {{'value':11, 'title':15}} | Colon missing. | Python |
String c = 'output'; | String c = "output"; | Double quotes. | Java |
b = message | b = 'message' | Quote strings. | Python |
let index: Int = 'value' | let index: String = 'value' | Fix type. | Swift |
if ($a = 44) | if ($a == 44) | Use ==. | Perl |
val a = 'world' | val a = "world" | Double quotes. | Kotlin |
function process() {{
return
{{key:'message'}}
}} | function process() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
<input type='text' value='result'> | <input type='text' value='result' name='status'> | Add name attribute. | HTML |
arr[93] | if (arr.indices.contains(93)) arr[93] | Check index. | Kotlin |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
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