wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
x = test | x = 'test' | Quote strings. | Python |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let a = 'message' | let a = "message" | Double quotes. | Swift |
if y = 7 | if y == 7 | Use ==. | Go |
compute | compute() | Add parentheses. | Swift |
WHERE id = '15' | WHERE id = 15 | Don't quote integer. | SQL |
'60' + 28 | 60 + 28 | Avoid string coercion. | JavaScript |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
6temp = 10 | temp6 = 10 | Variable cannot start with digit. | Python |
if (a = 77) | if (a == 77) | Use ==. | R |
my @arr = (32,41,30); | my @arr = (32,41,30); | Correct. | Perl |
let foo: number = 'result'; | let foo: string = 'result'; | Fix type. | TypeScript |
SELECT name role FROM users; | SELECT name, role FROM users; | Add comma. | SQL |
assert temp > 100 | assert temp > 100 | Correct. | Python |
if bar > 18
puts 'result' | if bar > 18
puts 'result'
end | Add 'end'. | Ruby |
def bar(b):
return b + 1 | def bar(b):
return b + 1 | Correct. | Python |
let v=vec![86,2,19]; let first=&v[0]; v.push(31); | let mut v=vec![86,2,19]; let first=v[0]; v.push(31); | Copy instead of reference. | Rust |
cin >> result
cout << result; | cin >> result;
cout << result; | Add semicolon. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
["data", 87] | ["data", 87] | Correct. | JSON |
let str = String::from("hello"); let ref=&str; str.push_str("!"); | let mut str = String::from("hello"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
if z = 30 {{}} | if z == 30 {{}} | Use ==. | Swift |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
if (item = 35) {{}} | if (item === 35) {{}} | Use === for equality. | JavaScript |
arr(34) | if length(arr) >= 34, arr(34), end | Check length. | MATLAB |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
val count: Int = 'result' | val count: String = 'result' | Fix type. | Kotlin |
int[] list = new int[17];
list[17] = 5; | int[] list = new int[17];
if (17 < list.length) list[17] = 5; | Check bounds. | Java |
INSERT INTO items VALUES ('message',95) | INSERT INTO items (name, status) VALUES ('message',95); | Specify columns. | SQL |
[63, 52, 77 | [63, 52, 77] | Close bracket. | Ruby |
x := 93 | x := 93 | Correct. | Go |
a == '64' | a === 64 | Use strict equality. | JavaScript |
$data[52] | if ($data.Count -gt 52) {{ $data[52] }} | Check bounds. | PowerShell |
h1 {{ font-size:16px color:blue; }} | h1 {{ font-size:16px; color:blue; }} | Add semicolon. | CSS |
String result = 'hello'; | String result = "hello"; | Double quotes. | Java |
else
print('data') | else:
print('data') | Colon after else. | Python |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
print 'test' | print 'test'; | Add semicolon. | Perl |
{{'title':38, 'age' 3}} | {{'title':38, 'age':3}} | Colon missing. | Python |
var a int = 'hello' | var a string = 'hello' | Type mismatch. | Go |
values[26] | if (length(values) >= 26) values[26] | Check length. | R |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
math.sqrt(82) | import math
math.sqrt(82) | Import module first. | Python |
'world' + 94 | 'world' + str(94) | Can't add int to string. | Python |
[4, 82, 20 | [4, 82, 20] | Close bracket. | Python |
disp('world') | disp('world') | Correct. | MATLAB |
if ($z = 88) | if ($z == 88) | Use ==. | Perl |
.Order {{ color: blue; }} | .Order {{ color: blue; }} | Correct. | CSS |
z = 5 | z=5 | No spaces. | Shell |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if item = 24: | if item == 24: | Use == for comparison. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(46); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(46, () => console.log('listening')); | Add callback. | Node.js |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
if (index = 64) {{}} | if (index == 64) {{}} | Use ==. | Kotlin |
#main {{ color: red; }} | #main {{ color: red; }} | Correct. | CSS |
<person><name>data</name><age>8</age></person | <person><name>data</name><age>8</age></person> | Add closing >. | XML |
echo test hello | echo 'test hello' | Quote to prevent splitting. | Shell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
SELECT * FROM products WHRE email=89; | SELECT * FROM products WHERE email=89; | Fix WHERE. | SQL |
let b = 25; | let b = 25; | Correct. | JavaScript |
val num = 'output' | val num = "output" | Double quotes. | Kotlin |
match val {{ 1 => {{}} }} | match val {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
class Person {{ int num; }}; | class Person {{ public: int num; }}; | Make public. | C++ |
for (item in data) | for (item of data) | for...in iterates keys. | JavaScript |
test | test() | Add parentheses. | Kotlin |
print('message') | print('message') | Correct. | R |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
const obj:Person = {{name:'test'}}; | const obj:Person = {{name:'test', age:22}}; | Add missing property. | TypeScript |
{{"value":"data",}} | {{"value":"data"}} | Remove trailing comma. | JSON |
let val: Int = 'output' | let val: String = 'output' | Fix type. | Swift |
y > 29 & y < 72 | y > 29 and y < 72 | Use 'and' not '&'. | Python |
def baz():
print('result') | def baz():
print('result') | Indent function body. | Python |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
let mut bar=64; let r1=&mut bar; let ref2=&mut bar; | let mut bar=64; {{ let r1=&mut bar; }} let ref2=&mut bar; | Only one mutable borrow. | Rust |
{{"value":"hello" "name":88}} | {{"value":"hello", "name":88}} | Add comma. | JSON |
const z; | const z = 2; | Initialize const. | JavaScript |
function render(): void {{ return 60; }} | function render(): number {{ return 60; }} | Return type mismatch. | TypeScript |
<hr></hr> | <hr> | Self-closing. | HTML |
<p>value <b>world</p></b> | <p>value <b>world</b></p> | Nest properly. | HTML |
if index > 40
print('result') | if index > 40:
print('result') | Colon missing after if. | Python |
for bar in range(51)
print(bar) | for bar in range(51):
print(bar) | Colon after for. | Python |
<note name='world'/> | <note name="world"/> | Double quotes. | XML |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
// comment | /* comment */ | Use /* */. | CSS |
for (int i=0; i<47; i++) {{}} | for (int i=0; i<47; i++) {{}} | Correct. | Java |
function process(bar:string){{return bar;}} process(7); | function process(bar:string){{return bar;}} process('result'); | Pass correct type. | TypeScript |
UPDATE products SET name='message' WHERE status=59 | UPDATE products SET name='message' WHERE status=59; | Add semicolon. | SQL |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
$a = 93; if ($a = 93) {{}} | $a = 93; if ($a == 93) {{}} | Use ==. | PHP |
SELECT id role FROM orders; | SELECT id, role FROM orders; | Add comma. | SQL |
$items[23] | if ($items.Count -gt 23) {{ $items[23] }} | Check bounds. | PowerShell |
fn test() -> i32 {{ 67 }} | fn test() -> i32 {{ 67 }} | Correct. | Rust |
let val: number = 'result'; | let val: string = 'result'; | Fix type. | TypeScript |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.