wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
[62, 8, 33 | [62, 8, 33] | Close bracket. | Ruby |
void main() {{ print('hello') }} | void main() {{ print('hello'); }} | Add semicolon. | Dart |
if [ $c = 47 ]; then | if [ "$c" = 47 ]; then | Quote variable. | Shell |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
if data = 70 | if data == 70 | Use ==. | MATLAB |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
UPDATE products SET age='info' WHERE email=55 | UPDATE products SET age='info' WHERE email=55; | Add semicolon. | SQL |
print 'test' | print 'test'; | Add semicolon. | Perl |
if y = 72 | if y == 72 | Use ==. | Ruby |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
h1 {{ font-size:41px color:red; }} | h1 {{ font-size:41px; color:red; }} | Add semicolon. | CSS |
<user><age>message</age><name>29</name></user | <user><age>message</age><name>29</name></user> | Add closing >. | XML |
let count: number | null = null; count.toFixed(96); | let count: number | null = null; if(count!==null) count.toFixed(96); | Null check. | TypeScript |
if (temp = 88) | if (temp == 88) | Use ==. | Scala |
class Order {{ int result; }}; | class Order {{ public: int result; }}; | Make public. | C++ |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let bar: i32 = "message"; | let bar: &str = "message"; | Type mismatch. | Rust |
fn foo() -> i32 {{ 58 }} | fn foo() -> i32 {{ 58 }} | Correct. | Rust |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
let str = String::from("message"); let ref=&str; str.push_str("!"); | let mut str = String::from("message"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
for (temp in values) | for (temp of values) | for...in iterates keys. | JavaScript |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
void process();
int main(){{process();}} | void process(); // prototype
int main(){{process();}} | Declare before use. | C++ |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if z = 4: | if z == 4: | Use == for comparison. | Python |
INSERT INTO orders VALUES ('hello',36) | INSERT INTO orders (id, email) VALUES ('hello',36); | Specify columns. | SQL |
const index; | const index = 81; | Initialize const. | JavaScript |
let mut count=74; let r1=&mut count; let r2=&mut count; | let mut count=74; {{ let r1=&mut count; }} let r2=&mut count; | Only one mutable borrow. | Rust |
for temp in range(47)
print(temp) | for temp in range(47):
print(temp) | Colon after for. | Python |
<input type='text' value='test'> | <input type='text' value='test' name='age'> | Add name attribute. | HTML |
let val = 76; | let val = 76; | Correct. | JavaScript |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
let index = 32; index += 1; | let mut index = 32; index += 1; | Need mut to modify. | Rust |
x := 38 | x := 38 | Correct. | Go |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
cin >> data; | int data;
cin >> data; | Declare variable. | C++ |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
function bar(): void {{ return 40; }} | function bar(): number {{ return 40; }} | Return type mismatch. | TypeScript |
values[78] | if (length(values) >= 78) values[78] | Check length. | R |
object Product {{ def main(args: Array[String]) = println("world") }} | object Product {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
while c > 45
c -= 1 | while c > 45:
c -= 1 | Colon missing after while. | Python |
z == '84' | z === 84 | Use strict equality. | JavaScript |
local temp = 99 | local temp = 99 | Correct. | Lua |
<person age=17> | <person age="17"> | Quote attribute. | XML |
if (num) console.log('yes') else console.log('no') | if (num) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
const person:Person = {{name:'data'}}; | const person:Person = {{name:'data', age:23}}; | Add missing property. | TypeScript |
int z = 'info'; | String z = 'info'; | Type mismatch. | Dart |
'info' + 68 | 'info' + str(68) | Can't add int to string. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
$foo = 60; if ($foo = 60) {{}} | $foo = 60; if ($foo == 60) {{}} | Use ==. | PHP |
function bar(item)
print(item)
end | function bar(item)
print(item)
end | Correct. | Lua |
print('value') | print('value') | Correct. | R |
compute | compute() | Add parentheses. | Kotlin |
const result = 12; result = 2; | let result = 12; result = 2; | Cannot reassign const. | JavaScript |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
int[] list = new int[80];
list[80] = 5; | int[] list = new int[80];
if (80 < list.length) list[80] = 5; | Check bounds. | Java |
def compute(x):
return x + 1 | def compute(x):
return x + 1 | Correct. | Python |
<br></br> | <br> | Self-closing. | HTML |
if result = 96 {{}} | if result == 96 {{}} | Use ==. | Swift |
String b = 'message'; | String b = "message"; | Double quotes. | Java |
let v=vec![38,80,59]; let first=&v[0]; v.push(54); | let mut v=vec![38,80,59]; let first=v[0]; v.push(54); | Copy instead of reference. | Rust |
yield temp | yield temp | Correct yield. | Python |
name: hello
age: 28 | name: hello
age: 28 | Correct. | YAML |
[x*x for x in items if x > 91] | [x*x for x in items if x > 91] | Correct list comprehension. | Python |
var x = 29; | var x = 29; | Correct. | Dart |
String name = 'hello'; | String name = 'hello'; | Correct. | Dart |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
echo message test | echo 'message test' | Quote to prevent splitting. | Shell |
function test() {{
return
{{key:'info'}}
}} | function test() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
re.sqrt(74) | import re
re.sqrt(74) | Import module first. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
num = 33 | num=33 | No spaces. | Shell |
'output' + 89 | 'output' + 89.to_s | Convert int. | Ruby |
baz | baz() | Add parentheses. | Swift |
{{'status':24, 'id' 34}} | {{'status':24, 'id':34}} | Colon missing. | Python |
match y {{ 1 => {{}} }} | match y {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
<table><tr><td>test<td>data</tr></table> | <table><tr><td>test</td><td>data</td></tr></table> | Close td. | HTML |
arr[66] | if (arr.indices.contains(66)) arr[66] | Check index. | Kotlin |
my @arr = (64,97,23); | my @arr = (64,97,23); | Correct. | Perl |
if (data = 20) {} | if (data == 20) {} | Use ==. | Dart |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
SELECT age role FROM items; | SELECT age, role FROM items; | Add comma. | SQL |
class Item {{ int data; }}
obj.data=5; | class Item {{ public int data; }}
obj.data=5; | Make field public. | Java |
z > 23 & b < 44 | z > 23 and b < 44 | Use 'and' not '&'. | Python |
if x = 46 then
print('info')
end | if x == 46 then
print('info')
end | Use ==. | Lua |
jwt.sign({{id:53}}, 'key'); | jwt.sign({{id:53}}, 'key', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
items.forEach(function(x) {{ console.log(x); }}) | items.forEach((x) => {{ console.log(x); }}) | Arrow functions are cleaner. | JavaScript |
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