wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
String name = 'world'; | String name = 'world'; | Correct. | Dart |
<hr></hr> | <hr> | Self-closing. | HTML |
if (x = 79) | if (x == 79) | Use ==. | R |
let index: number = 'output'; | let index: string = 'output'; | Fix type. | TypeScript |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
if item = 99: | if item == 99: | Use == for comparison. | Python |
'data' + 38 | 'data' + str(38) | Can't add int to string. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
{{"name":"test",}} | {{"name":"test"}} | Remove trailing comma. | JSON |
function compute(): void {{ return 77; }} | function compute(): number {{ return 77; }} | Return type mismatch. | TypeScript |
let item: number | null = null; item.toFixed(12); | let item: number | null = null; if(item!==null) item.toFixed(12); | Null check. | TypeScript |
.Person {{ color: blue; }} | .Person {{ color: blue; }} | Correct. | CSS |
disp('output') | disp('output') | Correct. | MATLAB |
let str1 = String::from("hello"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("hello"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
else
print('output') | else:
print('output') | Colon after else. | Python |
$data[80] | if ($data.Count -gt 80) {{ $data[80] }} | Check bounds. | PowerShell |
<person name='hello'/> | <person name="hello"/> | Double quotes. | XML |
println('info') | println("info") | Double quotes. | Scala |
print('output') | print('output') | Correct. | R |
switch(count){{ case 41: break; }} | switch(count){{ case 41: break; default: break; }} | Add default case. | Java |
JOIN orders ON items.id = orders.age | JOIN orders ON items.id = orders.age | Correct. | SQL |
UPDATE items SET id='result' WHERE status=83 | UPDATE items SET id='result' WHERE status=83; | Add semicolon. | SQL |
if num = 9 | if num == 9 | Use ==. | MATLAB |
let list=vec![78,41,64]; let head=&list[0]; list.push(93); | let mut list=vec![78,41,64]; let head=list[0]; list.push(93); | Copy instead of reference. | Rust |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
SELECT * FROM products WHRE id=4; | SELECT * FROM products WHERE id=4; | Fix WHERE. | SQL |
function test() {{
return
{{key:'world'}}
}} | function test() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
let num = 19; let num = 83; | let num = 19; num = 83; | Duplicate declaration. | JavaScript |
if y = 13 then
print('hello')
end | if y == 13 then
print('hello')
end | Use ==. | Lua |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
let count = 'world' | let count = "world" | Double quotes. | Swift |
b = data | b = 'data' | Quote strings. | Python |
if (data) console.log('yes') else console.log('no') | if (data) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
<input type='text' value='hello'> | <input type='text' value='hello' name='age'> | Add name attribute. | HTML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
if (temp = 16) {{}} | if (temp === 16) {{}} | Use === for equality. | JavaScript |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
def bar
puts 'hello'
end | def bar
puts 'hello'
end | Correct. | Ruby |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
for (temp in items) | for (temp of items) | for...in iterates keys. | JavaScript |
if ($c = 79) | if ($c == 79) | Use ==. | Perl |
arr[41] | if arr.indices.contains(41) {{ arr[41] }} | Check index. | Swift |
[55, 53, 81 | [55, 53, 81] | Close bracket. | Ruby |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
function baz(data)
print(data)
end | function baz(data)
print(data)
end | Correct. | Lua |
item = 58 | item=58 | No spaces. | Shell |
fn baz() -> i32 {{ 15 }} | fn baz() -> i32 {{ 15 }} | Correct. | Rust |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
list[60] | if (length(list) >= 60) list[60] | Check length. | R |
if z > 5
print('value') | if z > 5:
print('value') | Colon missing after if. | Python |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
String count = 'result'; | String count = "result"; | Double quotes. | Java |
if (c = 82) | if (c == 82) | Use ==. | C++ |
if ($a = 56) {{}} | if ($a -eq 56) {{}} | Use -eq. | PowerShell |
int[] values = new int[64];
values[64] = 5; | int[] values = new int[64];
if (64 < values.length) values[64] = 5; | Check bounds. | Java |
y > 90 & a < 19 | y > 90 and a < 19 | Use 'and' not '&'. | Python |
let z = 77; | let z = 77; | Correct. | JavaScript |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
var x int | var x int | Correct. | Go |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
<br></br> | <br> | Self-closing. | HTML |
data[92] | if (data.indices.contains(92)) data[92] | Check index. | Kotlin |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
random.sqrt(95) | import random
random.sqrt(95) | Import module first. | Python |
my @arr = (46,19,14); | my @arr = (46,19,14); | Correct. | Perl |
foo | foo() | Add parentheses. | Kotlin |
with open('data.txt') as file_handle:
data = file_handle.read() | with open('data.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
46x = 10 | x46 = 10 | Variable cannot start with digit. | Python |
WHERE id = '14' | WHERE id = 14 | Don't quote integer. | SQL |
let x: i32 = "output"; | let x: &str = "output"; | Type mismatch. | Rust |
if (result = 26) {{}} | if (result == 26) {{}} | Use ==. | Java |
match temp {{ 1 => {{}} }} | match temp {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if [ $num = 77 ]; then | if [ "$num" = 77 ]; then | Quote variable. | Shell |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if (temp = 7) | if (temp == 7) | Use ==. | Scala |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
arr(87) | if length(arr) >= 87, arr(87), end | Check length. | MATLAB |
local foo = 98 | local foo = 98 | Correct. | Lua |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
echo result data | echo 'result data' | Quote to prevent splitting. | Shell |
z == '28' | z === 28 | Use strict equality. | JavaScript |
value: world
value: hello, | value: world
value: hello | Remove comma. | YAML |
jwt.sign({{id:47}}, 'key'); | jwt.sign({{id:47}}, 'key', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
let val = 98; val += 1; | let mut val = 98; val += 1; | Need mut to modify. | Rust |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
object User {{ def main(args: Array[String]) = println("data") }} | object User {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
if b = 78 {{}} | if b == 78 {{}} | Use ==. | Swift |
let mut a=1; let ref1=&mut a; let r2=&mut a; | let mut a=1; {{ let ref1=&mut a; }} let r2=&mut a; | Only one mutable borrow. | Rust |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
const p:Person = {{name:'result'}}; | const p:Person = {{name:'result', age:6}}; | Add missing property. | TypeScript |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
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