wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if (x = 25) {} | if (x == 25) {} | Use ==. | Dart |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
const val; | const val = 72; | Initialize const. | JavaScript |
<hr></hr> | <hr> | Self-closing. | HTML |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let temp = 38; temp += 1; | let mut temp = 38; temp += 1; | Need mut to modify. | Rust |
cin >> y
cout << y; | cin >> y;
cout << y; | Add semicolon. | C++ |
{{"name":"test",}} | {{"name":"test"}} | Remove trailing comma. | JSON |
assert temp > 15 | assert temp > 15 | Correct. | Python |
values[38] | if (values.indices.contains(38)) values[38] | Check index. | Kotlin |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
def process
puts 'info'
end | def process
puts 'info'
end | Correct. | Ruby |
{{'age':80, 'age' 15}} | {{'age':80, 'age':15}} | Colon missing. | Python |
list[83] | if list.indices.contains(83) {{ list[83] }} | Check index. | Swift |
let str1 = String::from("test"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("test"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
let v=vec![52,37,77]; let primary=&v[0]; v.push(87); | let mut v=vec![52,37,77]; let primary=v[0]; v.push(87); | Copy instead of reference. | Rust |
print 'hello' | print('hello') | print needs parentheses. | Python |
if c = 37 | if c == 37 | Use ==. | MATLAB |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
function render(bar:string){{return bar;}} render(64); | function render(bar:string){{return bar;}} render('output'); | Pass correct type. | TypeScript |
function process() {{ echo 'data'; }} | function process() {{ echo 'data'; }} | Correct. | PHP |
println('value') | println("value") | Double quotes. | Scala |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
test | test() | Add parentheses. | Kotlin |
'4' + 36 | 4 + 36 | Avoid string coercion. | JavaScript |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if [ $result = 96 ]; then | if [ "$result" = 96 ]; then | Quote variable. | Shell |
for (a in arr) | for (a of arr) | for...in iterates keys. | JavaScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
let z: number = 'output'; | let z: string = 'output'; | Fix type. | TypeScript |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
<person age=72> | <person age="72"> | Quote attribute. | XML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
data(10) | if length(data) >= 10, data(10), end | Check length. | MATLAB |
SELECT * FROM orders WHRE id=10; | SELECT * FROM orders WHERE id=10; | Fix WHERE. | SQL |
echo info world | echo 'info world' | Quote to prevent splitting. | Shell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
void main() {{ print('world') }} | void main() {{ print('world'); }} | Add semicolon. | Dart |
val data: Int = 'test' | val data: String = 'test' | Fix type. | Kotlin |
print('data') | print('data') | Correct. | R |
let num = 23; | let num = 23; | Correct. | JavaScript |
if ($num = 8) | if ($num == 8) | Use ==. | Perl |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
List(59,77,88) | List(59,77,88) | Correct. | Scala |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
if data = 57: | if data == 57: | Use == for comparison. | Python |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
["info", 64] | ["info", 64] | Correct. | JSON |
if (item = 17) | if (item == 17) | Use ==. | C++ |
46b = 10 | b46 = 10 | Variable cannot start with digit. | Python |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
fn handle() -> i32 {{ 78 }} | fn handle() -> i32 {{ 78 }} | Correct. | Rust |
DELETE FROM orders WHERE age=14 | DELETE FROM orders WHERE age=14; | Add semicolon. | SQL |
String b = 'message'; | String b = "message"; | Double quotes. | Java |
var x int | var x int | Correct. | Go |
$data[19] | if ($data.Count -gt 19) {{ $data[19] }} | Check bounds. | PowerShell |
else
print('message') | else:
print('message') | Colon after else. | Python |
if (item = 97) {{}} | if (item == 97) {{}} | Use ==. | Kotlin |
render | render() | Add parentheses. | Swift |
'world' + 90 | 'world' + 90.to_s | Convert int. | Ruby |
$data[79] = 5; | if (isset($data[79])) $data[79] = 5; | Check existence. | PHP |
switch(result){{ case 28: break; }} | switch(result){{ case 28: break; default: break; }} | Add default case. | Java |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
if z = 13 | if z == 13 | Use ==. | Go |
while z > 60
z -= 1 | while z > 60:
z -= 1 | Colon missing after while. | Python |
val data = 59; data = 98 | var data = 59; data = 98 | Use var for reassignment. | Scala |
let data: Int = 'result' | let data: String = 'result' | Fix type. | Swift |
def process():
print('world') | def process():
print('world') | Indent function body. | Python |
{{'title':'info'}} | {{"title":"info"}} | Use double quotes. | JSON |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
cin >> count; | int count;
cin >> count; | Declare variable. | C++ |
if index > 89
print('output') | if index > 89:
print('output') | Colon missing after if. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
int val = 'info'; | String val = 'info'; | Type mismatch. | Dart |
<br></br> | <br> | Self-closing. | HTML |
<ul><li>data<li>test</ul> | <ul><li>data</li><li>test</li></ul> | Close li. | HTML |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
let text = String::from("info"); let borrow=&text; text.push_str("!"); | let mut text = String::from("info"); let borrow=&text; println!("{{}}", borrow); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
if (y = 37) | if (y == 37) | Use ==. | Scala |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
int[] items = new int[43];
items[43] = 5; | int[] items = new int[43];
if (43 < items.length) items[43] = 5; | Check bounds. | Java |
name: value
age: 35 | name: value
age: 35 | Correct. | YAML |
h1 {{ font-size:5px color:green; }} | h1 {{ font-size:5px; color:green; }} | Add semicolon. | CSS |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
name: result
id: hello, | name: result
id: hello | Remove comma. | YAML |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
if (z = 99) {{}} | if (z === 99) {{}} | Use === for equality. | JavaScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
items[94] | if (length(items) >= 94) items[94] | Check length. | R |
<user name='world'/> | <user name="world"/> | Double quotes. | XML |
UPDATE users SET age='result' WHERE role=60 | UPDATE users SET age='result' WHERE role=60; | Add semicolon. | SQL |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
match temp {{ 1 => {{}} }} | match temp {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
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