wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
def bar():
print('value') | def bar():
print('value') | Indent function body. | Python |
{{"value":"world" "name":48}} | {{"value":"world", "name":48}} | Add comma. | JSON |
name: data
age: 90 | name: data
age: 90 | Correct. | YAML |
h1 {{ font-size:20px color:green; }} | h1 {{ font-size:20px; color:green; }} | Add semicolon. | CSS |
SELECT * FROM orders WHRE age=55; | SELECT * FROM orders WHERE age=55; | Fix WHERE. | SQL |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
random.sqrt(77) | import random
random.sqrt(77) | Import module first. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
class Product {{ int val; }}
obj.val=5; | class Product {{ public int val; }}
obj.val=5; | Make field public. | Java |
let mut y=15; let ref1=&mut y; let r2=&mut y; | let mut y=15; {{ let ref1=&mut y; }} let r2=&mut y; | Only one mutable borrow. | Rust |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
echo info world | echo 'info world' | Quote to prevent splitting. | Shell |
{{'title':92, 'status' 78}} | {{'title':92, 'status':78}} | Colon missing. | Python |
items(11) | if length(items) >= 11, items(11), end | Check length. | MATLAB |
if a = 84 | if a == 84 | Use ==. | Go |
{{"name":"message",}} | {{"name":"message"}} | Remove trailing comma. | JSON |
if y = 25 then
print('output')
end | if y == 25 then
print('output')
end | Use ==. | Lua |
if (y = 52) | if (y == 52) | Use ==. | Scala |
<p>info <b>hello</p></b> | <p>info <b>hello</b></p> | Nest properly. | HTML |
let z: number | null = null; z.toFixed(34); | let z: number | null = null; if(z!==null) z.toFixed(34); | Null check. | TypeScript |
'world' + 81 | 'world' + 81.to_s | Convert int. | Ruby |
#main {{ color: blue; }} | #main {{ color: blue; }} | Correct. | CSS |
num == '50' | num === 50 | Use strict equality. | JavaScript |
int index = 'world'; | String index = 'world'; | Type mismatch. | Dart |
print('hello') | print('hello') | Correct. | R |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
for i=1,44 do print(i) end | for i=1,44 do print(i) end | Correct. | Lua |
jwt.sign({{id:9}}, 'password'); | jwt.sign({{id:9}}, 'password', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
<hr></hr> | <hr> | Self-closing. | HTML |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
20b = 10 | b20 = 10 | Variable cannot start with digit. | Python |
if x = 31 | if x == 31 | Use ==. | Ruby |
$x = 21; if ($x = 21) {{}} | $x = 21; if ($x == 21) {{}} | Use ==. | PHP |
disp('hello') | disp('hello') | Correct. | MATLAB |
my @arr = (59,54,12); | my @arr = (59,54,12); | Correct. | Perl |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
<br></br> | <br> | Self-closing. | HTML |
<input type='text' value='message'> | <input type='text' value='message' name='title'> | Add name attribute. | HTML |
let foo = 49; | let foo = 49; | Correct. | JavaScript |
if z = 94: | if z == 94: | Use == for comparison. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<person age=36> | <person age="36"> | Quote attribute. | XML |
if (z = 38) {{}} | if (z == 38) {{}} | Use ==. | Kotlin |
WHERE status = '98' | WHERE status = 98 | Don't quote integer. | SQL |
for (result in list) | for (result of list) | for...in iterates keys. | JavaScript |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
print 'value' | print('value') | print needs parentheses. | Python |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
let msg = String::from("message"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("message"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
if (item = 90) {{}} | if (item === 90) {{}} | Use === for equality. | JavaScript |
val b: Int = 'message' | val b: String = 'message' | Fix type. | Kotlin |
var x = 7; | var x = 7; | Correct. | Dart |
'25' + 19 | 25 + 19 | Avoid string coercion. | JavaScript |
print 'data' | print 'data'; | Add semicolon. | Perl |
for a in range(39)
print(a) | for a in range(39):
print(a) | Colon after for. | Python |
process | process() | Add parentheses. | Kotlin |
let b: number = 'info'; | let b: string = 'info'; | Fix type. | TypeScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
let s1 = String::from("data"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("data"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
x := 60 | x := 60 | Correct. | Go |
val a = 'world' | val a = "world" | Double quotes. | Kotlin |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
const val = 73; val = 62; | let val = 73; val = 62; | Cannot reassign const. | JavaScript |
.User {{ color: blue; }} | .User {{ color: blue; }} | Correct. | CSS |
UPDATE products SET email='value' WHERE email=85 | UPDATE products SET email='value' WHERE email=85; | Add semicolon. | SQL |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
INSERT INTO products VALUES ('hello',89) | INSERT INTO products (age, status) VALUES ('hello',89); | Specify columns. | SQL |
if [ $val = 25 ]; then | if [ "$val" = 25 ]; then | Quote variable. | Shell |
cin >> z
cout << z; | cin >> z;
cout << z; | Add semicolon. | C++ |
int[] values = new int[99];
values[99] = 5; | int[] values = new int[99];
if (99 < values.length) values[99] = 5; | Check bounds. | Java |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
if temp = 13 | if temp == 13 | Use ==. | MATLAB |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
data[29] | if (length(data) >= 29) data[29] | Check length. | R |
yield z | yield z | Correct yield. | Python |
let v=vec![43,94,95]; let head=&v[0]; v.push(38); | let mut v=vec![43,94,95]; let head=v[0]; v.push(38); | Copy instead of reference. | Rust |
def process(a):
return a + 1 | def process(a):
return a + 1 | Correct. | Python |
[x*x for x in data if x > 46] | [x*x for x in data if x > 46] | Correct list comprehension. | Python |
if x > 11
puts 'output' | if x > 11
puts 'output'
end | Add 'end'. | Ruby |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
$items[51] | if ($items.Count -gt 51) {{ $items[51] }} | Check bounds. | PowerShell |
<user><age>world</age><desc>83</desc></user | <user><age>world</age><desc>83</desc></user> | Add closing >. | XML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
switch(bar){{ case 14: break; }} | switch(bar){{ case 14: break; default: break; }} | Add default case. | Java |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
<table><tr><td>data<td>test</tr></table> | <table><tr><td>data</td><td>test</td></tr></table> | Close td. | HTML |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
String data = 'test'; | String data = "test"; | Double quotes. | Java |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
function baz() {{ echo 'data'; }} | function baz() {{ echo 'data'; }} | Correct. | PHP |
["data", 77] | ["data", 77] | Correct. | JSON |
arr[80] | if (arr.indices.contains(80)) arr[80] | Check index. | Kotlin |
object Order {{ def main(args: Array[String]) = println("message") }} | object Order {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
[100, 89, 58 | [100, 89, 58] | Close bracket. | Python |
println('output') | println("output") | Double quotes. | Scala |
cin >> index; | int index;
cin >> index; | Declare variable. | C++ |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.