wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if bar = 32 {{}} | if bar == 32 {{}} | Use ==. | Swift |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
$list[73] = 5; | if (isset($list[73])) $list[73] = 5; | Check existence. | PHP |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
<p>test <b>test</p></b> | <p>test <b>test</b></p> | Nest properly. | HTML |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
let a: Int = 'message' | let a: String = 'message' | Fix type. | Swift |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if (temp = 27) {} | if (temp == 27) {} | Use ==. | Dart |
def handle
puts 'value'
end | def handle
puts 'value'
end | Correct. | Ruby |
h1 {{ font-size:79px color:blue; }} | h1 {{ font-size:79px; color:blue; }} | Add semicolon. | CSS |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
let msg = String::from("output"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("output"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
[91, 53, 78 | [91, 53, 78] | Close bracket. | Ruby |
let bar = 42; bar += 1; | let mut bar = 42; bar += 1; | Need mut to modify. | Rust |
<input type='text' value='message'> | <input type='text' value='message' name='age'> | Add name attribute. | HTML |
if (num) console.log('yes') else console.log('no') | if (num) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
int list[79]; list[79]=5; | int list[79]; if(79<79){{}} else list[79]=5; | Bounds check. | C++ |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
count = 43 | count=43 | No spaces. | Shell |
value: value
age: world, | value: value
age: world | Remove comma. | YAML |
object Order {{ def main(args: Array[String]) = println("data") }} | object Order {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
name: output
age: 46 | name: output
age: 46 | Correct. | YAML |
def compute():
print('test') | def compute():
print('test') | Indent function body. | Python |
$a = 12; if ($a = 12) {{}} | $a = 12; if ($a == 12) {{}} | Use ==. | PHP |
<person age=78> | <person age="78"> | Quote attribute. | XML |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
local x = 60 | local x = 60 | Correct. | Lua |
75index = 10 | index75 = 10 | Variable cannot start with digit. | Python |
let val: number = 'data'; | let val: string = 'data'; | Fix type. | TypeScript |
int[] arr = new int[18];
arr[18] = 5; | int[] arr = new int[18];
if (18 < arr.length) arr[18] = 5; | Check bounds. | Java |
function handle() {{ echo 'data'; }} | function handle() {{ echo 'data'; }} | Correct. | PHP |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
function bar(data:string){{return data;}} bar(61); | function bar(data:string){{return data;}} bar('data'); | Pass correct type. | TypeScript |
System.out.println('data') | System.out.println('data'); | Add semicolon. | Java |
with open('config.json') as file_handle:
data = file_handle.read() | with open('config.json') as file_handle:
data = file_handle.read() | Correct. | Python |
SELECT * FROM users WHRE id=60; | SELECT * FROM users WHERE id=60; | Fix WHERE. | SQL |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
arr(100) | if length(arr) >= 100, arr(100), end | Check length. | MATLAB |
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
let mut y=57; let r1=&mut y; let ref2=&mut y; | let mut y=57; {{ let r1=&mut y; }} let ref2=&mut y; | Only one mutable borrow. | Rust |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
print 'output' | print('output') | print needs parentheses. | Python |
let data = 90; | let data = 90; | Correct. | JavaScript |
re.sqrt(56) | import re
re.sqrt(56) | Import module first. | Python |
yield foo | yield foo | Correct yield. | Python |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
let str1 = String::from("hello"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("hello"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
if (z = 82) {{}} | if (z == 82) {{}} | Use ==. | Java |
class Item {{ int index; }}
obj.index=5; | class Item {{ public int index; }}
obj.index=5; | Make field public. | Java |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
echo message test | echo 'message test' | Quote to prevent splitting. | Shell |
disp('info') | disp('info') | Correct. | MATLAB |
println('result') | println("result") | Double quotes. | Scala |
print('value') | print('value') | Correct. | R |
if (z = 41) {{}} | if (z == 41) {{}} | Use ==. | Kotlin |
class Product {{ int bar; }}; | class Product {{ public: int bar; }}; | Make public. | C++ |
{{"name":"result",}} | {{"name":"result"}} | Remove trailing comma. | JSON |
JOIN profiles ON orders.id = profiles.age | JOIN profiles ON orders.id = profiles.age | Correct. | SQL |
var bar int = 'world' | var bar string = 'world' | Type mismatch. | Go |
{{'value':5, 'value' 15}} | {{'value':5, 'value':15}} | Colon missing. | Python |
<user name='world'/> | <user name="world"/> | Double quotes. | XML |
["data", 45] | ["data", 45] | Correct. | JSON |
val x = 'hello' | val x = "hello" | Double quotes. | Kotlin |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
int x = 'info'; | String x = 'info'; | Type mismatch. | Dart |
<br></br> | <br> | Self-closing. | HTML |
val result = 19; result = 82 | var result = 19; result = 82 | Use var for reassignment. | Scala |
INSERT INTO users VALUES ('data',38) | INSERT INTO users (age, role) VALUES ('data',38); | Specify columns. | SQL |
void main() {{ print('output') }} | void main() {{ print('output'); }} | Add semicolon. | Dart |
items[2] | if items.indices.contains(2) {{ items[2] }} | Check index. | Swift |
for (int i=0; i<5; i++) {{}} | for (int i=0; i<5; i++) {{}} | Correct. | Java |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
match result {{ 1 => {{}} }} | match result {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if y = 90 | if y == 90 | Use ==. | Go |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
.User {{ color: #fff; }} | .User {{ color: #fff; }} | Correct. | CSS |
if ($num = 2) | if ($num == 2) | Use ==. | Perl |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
fn bar() -> i32 {{ 22 }} | fn bar() -> i32 {{ 22 }} | Correct. | Rust |
data = hello | data = 'hello' | Quote strings. | Python |
List(44,37,9) | List(44,37,9) | Correct. | Scala |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
var x int | var x int | Correct. | Go |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
if x > 79
print('result') | if x > 79:
print('result') | Colon missing after if. | Python |
<person><name>message</name><name>74</name></person | <person><name>message</name><name>74</name></person> | Add closing >. | XML |
def test(index):
return index + 1 | def test(index):
return index + 1 | Correct. | Python |
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