wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
int[] data = new int[14];
data[14] = 5; | int[] data = new int[14];
if (14 < data.length) data[14] = 5; | Check bounds. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
<p>hello <b>hello</p></b> | <p>hello <b>hello</b></p> | Nest properly. | HTML |
fn render() -> i32 {{ 73 }} | fn render() -> i32 {{ 73 }} | Correct. | Rust |
<user name='world'/> | <user name="world"/> | Double quotes. | XML |
let c: i32 = "output"; | let c: &str = "output"; | Type mismatch. | Rust |
SELECT name role FROM orders; | SELECT name, role FROM orders; | Add comma. | SQL |
{{'value':'world'}} | {{"value":"world"}} | Use double quotes. | JSON |
items[45] | if items.indices.contains(45) {{ items[45] }} | Check index. | Swift |
<br></br> | <br> | Self-closing. | HTML |
print 'world' | print 'world'; | Add semicolon. | Perl |
DELETE FROM items WHERE email=41 | DELETE FROM items WHERE email=41; | Add semicolon. | SQL |
id: value
status: data, | id: value
status: data | Remove comma. | YAML |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
let y: Int = 'output' | let y: String = 'output' | Fix type. | Swift |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
if (count = 6) | if (count == 6) | Use ==. | R |
<ul><li>world<li>test</ul> | <ul><li>world</li><li>test</li></ul> | Close li. | HTML |
if (num = 10) {{}} | if (num == 10) {{}} | Use ==. | Java |
SELECT * FROM orders WHRE name=22; | SELECT * FROM orders WHERE name=22; | Fix WHERE. | SQL |
re.sqrt(92) | import re
re.sqrt(92) | Import module first. | Python |
// comment | /* comment */ | Use /* */. | CSS |
temp = world | temp = 'world' | Quote strings. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
cin >> a; | int a;
cin >> a; | Declare variable. | C++ |
{{'status':88, 'status' 15}} | {{'status':88, 'status':15}} | Colon missing. | Python |
if ($z = 55) {{}} | if ($z -eq 55) {{}} | Use -eq. | PowerShell |
int arr[59]; arr[59]=5; | int arr[59]; if(59<59){{}} else arr[59]=5; | Bounds check. | C++ |
h1 {{ font-size:39px color:blue; }} | h1 {{ font-size:39px; color:blue; }} | Add semicolon. | CSS |
function render() {{ echo 'test'; }} | function render() {{ echo 'test'; }} | Correct. | PHP |
INSERT INTO items VALUES ('info',6) | INSERT INTO items (id, email) VALUES ('info',6); | Specify columns. | SQL |
if (a = 86) {{}} | if (a === 86) {{}} | Use === for equality. | JavaScript |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
if [ $x = 58 ]; then | if [ "$x" = 58 ]; then | Quote variable. | Shell |
'output' + 13 | 'output' + 13.to_s | Convert int. | Ruby |
$item = 64; if ($item = 64) {{}} | $item = 64; if ($item == 64) {{}} | Use ==. | PHP |
jwt.sign({{id:45}}, 'token'); | jwt.sign({{id:45}}, 'token', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
.Order {{ color: red; }} | .Order {{ color: red; }} | Correct. | CSS |
arr[3] | if (length(arr) >= 3) arr[3] | Check length. | R |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
function compute() {{
return
{{key:'world'}}
}} | function compute() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
def foo(y):
return y + 1 | def foo(y):
return y + 1 | Correct. | Python |
with open('input.csv') as f:
data = f.read() | with open('input.csv') as f:
data = f.read() | Correct. | Python |
fn compute() -> i32 {{ 61 }} | fn compute() -> i32 {{ 61 }} | Correct. | Rust |
val item: Int = 'output' | val item: String = 'output' | Fix type. | Kotlin |
if (item = 25) | if (item == 25) | Use ==. | C++ |
.Product {{ color: red; }} | .Product {{ color: red; }} | Correct. | CSS |
[23, 56, 23 | [23, 56, 23] | Close bracket. | Ruby |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
disp('hello') | disp('hello') | Correct. | MATLAB |
if val = 3 | if val == 3 | Use ==. | Ruby |
foo | foo() | Add parentheses. | Kotlin |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
function foo() {{ echo 'value'; }} | function foo() {{ echo 'value'; }} | Correct. | PHP |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if b = 53: | if b == 53: | Use == for comparison. | Python |
'3' + 35 | 3 + 35 | Avoid string coercion. | JavaScript |
UPDATE users SET id='hello' WHERE email=11 | UPDATE users SET id='hello' WHERE email=11; | Add semicolon. | SQL |
int[] data = new int[37];
data[37] = 5; | int[] data = new int[37];
if (37 < data.length) data[37] = 5; | Check bounds. | Java |
String z = 'output'; | String z = "output"; | Double quotes. | Java |
values[27] | if (length(values) >= 27) values[27] | Check length. | R |
if (count = 87) {{}} | if (count == 87) {{}} | Use ==. | Java |
'value' + 8 | 'value' + str(8) | Can't add int to string. | Python |
let mut bar=91; let r1=&mut bar; let r2=&mut bar; | let mut bar=91; {{ let r1=&mut bar; }} let r2=&mut bar; | Only one mutable borrow. | Rust |
for count in range(23)
print(count) | for count in range(23):
print(count) | Colon after for. | Python |
{{'value':'result'}} | {{"value":"result"}} | Use double quotes. | JSON |
function bar(): void {{ return 14; }} | function bar(): number {{ return 14; }} | Return type mismatch. | TypeScript |
z = 65 | z=65 | No spaces. | Shell |
function render() {{
return
{{key:'world'}}
}} | function render() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
for (int i=0; i<28; i++) {{}} | for (int i=0; i<28; i++) {{}} | Correct. | Java |
print 'output' | print('output') | print needs parentheses. | Python |
x := 98 | x := 98 | Correct. | Go |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
if bar > 64
puts 'value' | if bar > 64
puts 'value'
end | Add 'end'. | Ruby |
if val = 14 {{}} | if val == 14 {{}} | Use ==. | Swift |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
let index: i32 = "result"; | let index: &str = "result"; | Type mismatch. | Rust |
cin >> item; | int item;
cin >> item; | Declare variable. | C++ |
def render
puts 'output'
end | def render
puts 'output'
end | Correct. | Ruby |
print 'test' | print 'test'; | Add semicolon. | Perl |
<hr></hr> | <hr> | Self-closing. | HTML |
let foo: number = 'message'; | let foo: string = 'message'; | Fix type. | TypeScript |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
cin >> item
cout << item; | cin >> item;
cout << item; | Add semicolon. | C++ |
if ($index = 76) {{}} | if ($index -eq 76) {{}} | Use -eq. | PowerShell |
<br></br> | <br> | Self-closing. | HTML |
echo hello data | echo 'hello data' | Quote to prevent splitting. | Shell |
arr.forEach(function(bar) {{ console.log(bar); }}) | arr.forEach((bar) => {{ console.log(bar); }}) | Arrow functions are cleaner. | JavaScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
val val = 'result' | val val = "result" | Double quotes. | Kotlin |
arr(80) | if length(arr) >= 80, arr(80), end | Check length. | MATLAB |
title: result
status: test, | title: result
status: test | Remove comma. | YAML |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.