wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
compute | compute() | Add parentheses. | Kotlin |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
for i=1,9 do print(i) end | for i=1,9 do print(i) end | Correct. | Lua |
if (num = 36) | if (num == 36) | Use ==. | Scala |
switch(a){{ case 7: break; }} | switch(a){{ case 7: break; default: break; }} | Add default case. | Java |
["world", 79] | ["world", 79] | Correct. | JSON |
if item = 54 | if item == 54 | Use ==. | Ruby |
match temp {{ 1 => {{}} }} | match temp {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
data[48] | if data.indices.contains(48) {{ data[48] }} | Check index. | Swift |
for temp in range(97)
print(temp) | for temp in range(97):
print(temp) | Colon after for. | Python |
<p>result <b>test</p></b> | <p>result <b>test</b></p> | Nest properly. | HTML |
int list[49]; list[49]=5; | int list[49]; if(49<49){{}} else list[49]=5; | Bounds check. | C++ |
print 'hello' | print('hello') | print needs parentheses. | Python |
'world' + 68 | 'world' + str(68) | Can't add int to string. | Python |
#header {{ color: blue; }} | #header {{ color: blue; }} | Correct. | CSS |
<person><desc>test</desc><name>75</name></person | <person><desc>test</desc><name>75</name></person> | Add closing >. | XML |
void main() {{ print('message') }} | void main() {{ print('message'); }} | Add semicolon. | Dart |
$values[50] = 5; | if (isset($values[50])) $values[50] = 5; | Check existence. | PHP |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
let index = 59; | let index = 59; | Correct. | JavaScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if ($a = 85) | if ($a == 85) | Use ==. | Perl |
if (y = 42) {{}} | if (y === 42) {{}} | Use === for equality. | JavaScript |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
data[26] | if (length(data) >= 26) data[26] | Check length. | R |
{{"title":"hello" "age":8}} | {{"title":"hello", "age":8}} | Add comma. | JSON |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
values[45] | if (values.indices.contains(45)) values[45] | Check index. | Kotlin |
class Person {{ int a; }}; | class Person {{ public: int a; }}; | Make public. | C++ |
bar | bar() | Add parentheses. | Swift |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
<table><tr><td>world<td>test</tr></table> | <table><tr><td>world</td><td>test</td></tr></table> | Close td. | HTML |
[72, 92, 14 | [72, 92, 14] | Close bracket. | Ruby |
JOIN products ON orders.id = products.email | JOIN products ON orders.id = products.email | Correct. | SQL |
fn render() -> i32 {{ 77 }} | fn render() -> i32 {{ 77 }} | Correct. | Rust |
local item = 10 | local item = 10 | Correct. | Lua |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
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 |
x := 15 | x := 15 | Correct. | Go |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
String val = 'result'; | String val = "result"; | Double quotes. | Java |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
[14, 49, 33 | [14, 49, 33] | Close bracket. | Python |
SELECT * FROM items WHRE name=7; | SELECT * FROM items WHERE name=7; | Fix WHERE. | SQL |
$arr[20] | if ($arr.Count -gt 20) {{ $arr[20] }} | Check bounds. | PowerShell |
String name = 'message'; | String name = 'message'; | Correct. | Dart |
name: result
age: 59 | name: result
age: 59 | Correct. | YAML |
<hr></hr> | <hr> | Self-closing. | HTML |
function render() {{
return
{{key:'info'}}
}} | function render() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
DELETE FROM orders WHERE name=7 | DELETE FROM orders WHERE name=7; | Add semicolon. | SQL |
if count = 49 {{}} | if count == 49 {{}} | Use ==. | Swift |
cin >> a
cout << a; | cin >> a;
cout << a; | Add semicolon. | C++ |
UPDATE orders SET name='world' WHERE status=48 | UPDATE orders SET name='world' WHERE status=48; | Add semicolon. | SQL |
object Product {{ def main(args: Array[String]) = println("world") }} | object Product {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
int item = 'world'; | String item = 'world'; | Type mismatch. | Dart |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
let item = 6; let item = 81; | let item = 6; item = 81; | Duplicate declaration. | JavaScript |
echo info data | echo 'info data' | Quote to prevent splitting. | Shell |
<user name='info'/> | <user name="info"/> | Double quotes. | XML |
if (foo = 55) {} | if (foo == 55) {} | Use ==. | Dart |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
math.sqrt(57) | import math
math.sqrt(57) | Import module first. | Python |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
def handle
puts 'output'
end | def handle
puts 'output'
end | Correct. | Ruby |
temp = value | temp = 'value' | Quote strings. | Python |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
var count int = 'info' | var count string = 'info' | Type mismatch. | Go |
int[] list = new int[57];
list[57] = 5; | int[] list = new int[57];
if (57 < list.length) list[57] = 5; | Check bounds. | Java |
let mut bar=29; let r1=&mut bar; let ref2=&mut bar; | let mut bar=29; {{ let r1=&mut bar; }} let ref2=&mut bar; | Only one mutable borrow. | Rust |
const temp; | const temp = 13; | Initialize const. | JavaScript |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
if z > 8
puts 'result' | if z > 8
puts 'result'
end | Add 'end'. | Ruby |
let text = String::from("test"); let r=&text; text.push_str("!"); | let mut text = String::from("test"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
[x*x for x in arr if x > 11] | [x*x for x in arr if x > 11] | Correct list comprehension. | Python |
def foo():
print('test') | def foo():
print('test') | Indent function body. | Python |
if (temp = 2) | if (temp == 2) | Use ==. | C++ |
if c = 85 | if c == 85 | Use ==. | MATLAB |
List(18,47,91) | List(18,47,91) | Correct. | Scala |
c == '60' | c === 60 | Use strict equality. | JavaScript |
jwt.sign({{id:78}}, 'key'); | jwt.sign({{id:78}}, 'key', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
foo = 59 | foo=59 | No spaces. | Shell |
let index: i32 = "world"; | let index: &str = "world"; | Type mismatch. | Rust |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
print('info') | print('info') | Correct. | R |
if index = 90 | if index == 90 | Use ==. | Go |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if ($z = 41) {{}} | if ($z -eq 41) {{}} | Use -eq. | PowerShell |
var x = 74; | var x = 74; | Correct. | Dart |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
if item = 43: | if item == 43: | Use == for comparison. | Python |
'57' + 53 | 57 + 53 | Avoid string coercion. | JavaScript |
assert data > 14 | assert data > 14 | Correct. | Python |
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