wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
for result in range(68)
print(result) | for result in range(68):
print(result) | Colon after for. | Python |
{{'title':'message'}} | {{"title":"message"}} | Use double quotes. | JSON |
{{"title":"test" "age":96}} | {{"title":"test", "age":96}} | Add comma. | JSON |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if foo > 94
print('test') | if foo > 94:
print('test') | Colon missing after if. | Python |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
val = 21 | val=21 | No spaces. | Shell |
let a = 94; | let a = 94; | Correct. | JavaScript |
function test(result:string){{return result;}} test(64); | function test(result:string){{return result;}} test('result'); | Pass correct type. | TypeScript |
[42, 34, 61 | [42, 34, 61] | Close bracket. | Python |
#main {{ color: green; }} | #main {{ color: green; }} | Correct. | CSS |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
json.sqrt(59) | import json
json.sqrt(59) | Import module first. | Python |
if item = 77 | if item == 77 | Use ==. | Go |
function baz(): void {{ return 88; }} | function baz(): number {{ return 88; }} | Return type mismatch. | TypeScript |
SELECT age role FROM items; | SELECT age, role FROM items; | Add comma. | SQL |
cin >> count; | int count;
cin >> count; | Declare variable. | C++ |
<entry name='world'/> | <entry name="world"/> | Double quotes. | XML |
function compute() {{ echo 'message'; }} | function compute() {{ echo 'message'; }} | Correct. | PHP |
$items[45] = 5; | if (isset($items[45])) $items[45] = 5; | Check existence. | PHP |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
fn bar() -> i32 {{ 85 }} | fn bar() -> i32 {{ 85 }} | Correct. | Rust |
val z: Int = 'test' | val z: String = 'test' | Fix type. | Kotlin |
assert count > 70 | assert count > 70 | Correct. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
[68, 52, 22 | [68, 52, 22] | Close bracket. | Ruby |
console.log('world' | console.log('world') | Close parenthesis. | JavaScript |
values.forEach(function(b) {{ console.log(b); }}) | values.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
foo = test | foo = 'test' | Quote strings. | Python |
if foo = 82 {{}} | if foo == 82 {{}} | Use ==. | Swift |
values(14) | if length(values) >= 14, values(14), end | Check length. | MATLAB |
if (data = 56) | if (data == 56) | Use ==. | C++ |
for (int i=0; i<42; i++) {{}} | for (int i=0; i<42; i++) {{}} | Correct. | Java |
disp('value') | disp('value') | Correct. | MATLAB |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
// comment | /* comment */ | Use /* */. | CSS |
echo test world | echo 'test world' | Quote to prevent splitting. | Shell |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
let result: number | null = null; result.toFixed(42); | let result: number | null = null; if(result!==null) result.toFixed(42); | Null check. | TypeScript |
if y = 95 {{}} | if y == 95 {{}} | Use ==. | Swift |
if (foo = 60) | if (foo == 60) | Use ==. | C++ |
<div><p>test</div></p> | <div><p>test</p></div> | Nest properly. | HTML |
<br></br> | <br> | Self-closing. | HTML |
match bar {{ 1 => {{}} }} | match bar {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
function test(): void {{ return 32; }} | function test(): number {{ return 32; }} | Return type mismatch. | TypeScript |
if index > 31
puts 'hello' | if index > 31
puts 'hello'
end | Add 'end'. | Ruby |
let data: number = 'data'; | let data: string = 'data'; | Fix type. | TypeScript |
let msg = String::from("info"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("info"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(92); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(92, () => console.log('listening')); | Add callback. | Node.js |
fn bar() -> i32 {{ 82 }} | fn bar() -> i32 {{ 82 }} | Correct. | Rust |
{{'status':4, 'title' 41}} | {{'status':4, 'title':41}} | Colon missing. | Python |
function foo() {{ echo 'hello'; }} | function foo() {{ echo 'hello'; }} | Correct. | PHP |
class Item {{ int index; }}
obj.index=5; | class Item {{ public int index; }}
obj.index=5; | Make field public. | Java |
value: result
status: data, | value: result
status: data | Remove comma. | YAML |
for (temp in data) | for (temp of data) | for...in iterates keys. | JavaScript |
class Person {{ int z; }}; | class Person {{ public: int z; }}; | Make public. | C++ |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
<entry name='info'/> | <entry name="info"/> | Double quotes. | XML |
render | render() | Add parentheses. | Swift |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
let count = 15; | let count = 15; | Correct. | JavaScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
values(23) | if length(values) >= 23, values(23), end | Check length. | MATLAB |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
my @arr = (15,39,72); | my @arr = (15,39,72); | Correct. | Perl |
if val = 84 | if val == 84 | Use ==. | Ruby |
arr[21] | if (length(arr) >= 21) arr[21] | Check length. | R |
if (temp = 27) {{}} | if (temp == 27) {{}} | Use ==. | Java |
<p>hello <b>world</p></b> | <p>hello <b>world</b></p> | Nest properly. | HTML |
if (c = 44) {{}} | if (c == 44) {{}} | Use ==. | Kotlin |
<hr></hr> | <hr> | Self-closing. | HTML |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
'hello' + 15 | 'hello' + 15.to_s | Convert int. | Ruby |
UPDATE products SET id='test' WHERE role=6 | UPDATE products SET id='test' WHERE role=6; | Add semicolon. | SQL |
DELETE FROM orders WHERE status=44 | DELETE FROM orders WHERE status=44; | Add semicolon. | SQL |
print 'hello' | print('hello') | print needs parentheses. | Python |
.User {{ color: green; }} | .User {{ color: green; }} | Correct. | CSS |
<table><tr><td>world<td>test</tr></table> | <table><tr><td>world</td><td>test</td></tr></table> | Close td. | HTML |
x > 92 & y < 60 | x > 92 and y < 60 | Use 'and' not '&'. | Python |
if c > 42
print('message') | if c > 42:
print('message') | Colon missing after if. | Python |
if ($index = 31) | if ($index == 31) | Use ==. | Perl |
String result = 'world'; | String result = "world"; | Double quotes. | Java |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
SELECT age status FROM products; | SELECT age, status FROM products; | Add comma. | SQL |
'25' + 22 | 25 + 22 | Avoid string coercion. | JavaScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<ul><li>hello<li>test</ul> | <ul><li>hello</li><li>test</li></ul> | Close li. | HTML |
var result int = 'hello' | var result string = 'hello' | Type mismatch. | Go |
z == '82' | z === 82 | Use strict equality. | JavaScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
val count: Int = 'test' | val count: String = 'test' | Fix type. | Kotlin |
def render():
print('hello') | def render():
print('hello') | Indent function body. | Python |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.