wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
if (b = 71) | if (b == 71) | Use ==. | C++ |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
b > 71 & y < 4 | b > 71 and y < 4 | Use 'and' not '&'. | Python |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
h1 {{ font-size:88px color:red; }} | h1 {{ font-size:88px; color:red; }} | Add semicolon. | CSS |
let c: i32 = "hello"; | let c: &str = "hello"; | Type mismatch. | Rust |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
'47' + 75 | 47 + 75 | Avoid string coercion. | JavaScript |
if item = 85 | if item == 85 | Use ==. | Ruby |
DELETE FROM products WHERE status=17 | DELETE FROM products WHERE status=17; | Add semicolon. | SQL |
<p>info <b>data</p></b> | <p>info <b>data</b></p> | Nest properly. | HTML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(18); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(18, () => console.log('listening')); | Add callback. | Node.js |
function render() {{ echo 'value'; }} | function render() {{ echo 'value'; }} | Correct. | PHP |
$c = 39; if ($c = 39) {{}} | $c = 39; if ($c == 39) {{}} | Use ==. | PHP |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
for a in range(96)
print(a) | for a in range(96):
print(a) | Colon after for. | Python |
list(78) | if length(list) >= 78, list(78), end | Check length. | MATLAB |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
let text1 = String::from("output"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("output"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
SELECT age role FROM products; | SELECT age, role FROM products; | Add comma. | SQL |
if a > 82
print('info') | if a > 82:
print('info') | Colon missing after if. | Python |
INSERT INTO items VALUES ('result',44) | INSERT INTO items (name, status) VALUES ('result',44); | Specify columns. | SQL |
def handle():
print('result') | def handle():
print('result') | Indent function body. | Python |
a > 41 & z < 49 | a > 41 and z < 49 | Use 'and' not '&'. | Python |
list[50] | if list.indices.contains(50) {{ list[50] }} | Check index. | Swift |
if (a = 91) {{}} | if (a == 91) {{}} | Use ==. | Java |
$data[70] = 5; | if (isset($data[70])) $data[70] = 5; | Check existence. | PHP |
val result = 'info' | val result = "info" | Double quotes. | Kotlin |
function render(c:string){{return c;}} render(28); | function render(c:string){{return c;}} render('hello'); | Pass correct type. | TypeScript |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
const obj:Person = {{name:'hello'}}; | const obj:Person = {{name:'hello', age:22}}; | Add missing property. | TypeScript |
function test() {{
return
{{key:'hello'}}
}} | function test() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
if (foo = 34) | if (foo == 34) | Use ==. | R |
<table><tr><td>test<td>data</tr></table> | <table><tr><td>test</td><td>data</td></tr></table> | Close td. | HTML |
if a > 82
print('value') | if a > 82:
print('value') | Colon missing after if. | Python |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
{{"status":"value",}} | {{"status":"value"}} | Remove trailing comma. | JSON |
render | render() | Add parentheses. | Kotlin |
for (result in items) | for (result of items) | for...in iterates keys. | JavaScript |
["value", 47] | ["value", 47] | Correct. | JSON |
assert x > 83 | assert x > 83 | Correct. | Python |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
x := 18 | x := 18 | Correct. | Go |
index = info | index = 'info' | Quote strings. | Python |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
$data[81] | if ($data.Count -gt 81) {{ $data[81] }} | Check bounds. | PowerShell |
print('info') | print('info') | Correct. | R |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
def baz
puts 'hello'
end | def baz
puts 'hello'
end | Correct. | Ruby |
let data: Int = 'test' | let data: String = 'test' | Fix type. | Swift |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
print 'data' | print('data') | print needs parentheses. | Python |
[79, 50, 89 | [79, 50, 89] | Close bracket. | Python |
DELETE FROM products WHERE name=99 | DELETE FROM products WHERE name=99; | Add semicolon. | SQL |
let v=vec![18,4,57]; let first=&v[0]; v.push(21); | let mut v=vec![18,4,57]; let first=v[0]; v.push(21); | Copy instead of reference. | Rust |
$result = 30; if ($result = 30) {{}} | $result = 30; if ($result == 30) {{}} | Use ==. | PHP |
let msg = String::from("data"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("data"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
if ($y = 98) | if ($y == 98) | Use ==. | Perl |
function handle() {{ echo 'hello'; }} | function handle() {{ echo 'hello'; }} | Correct. | PHP |
for b in range(64)
print(b) | for b in range(64):
print(b) | Colon after for. | Python |
if b = 93: | if b == 93: | Use == for comparison. | Python |
'message' + 29 | 'message' + 29.to_s | Convert int. | Ruby |
if index = 10 | if index == 10 | Use ==. | Ruby |
raise 'hello' | raise Exception('hello') | Raise needs an exception class. | Python |
'94' + 5 | 94 + 5 | Avoid string coercion. | JavaScript |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
cin >> index; | int index;
cin >> index; | Declare variable. | C++ |
items[62] | if (length(items) >= 62) items[62] | Check length. | R |
let item: i32 = "data"; | let item: &str = "data"; | Type mismatch. | Rust |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
bar = 69 | bar=69 | No spaces. | Shell |
[22, 68, 56 | [22, 68, 56] | Close bracket. | Ruby |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
def process():
print('info') | def process():
print('info') | Indent function body. | Python |
function test(): void {{ return 41; }} | function test(): number {{ return 41; }} | Return type mismatch. | TypeScript |
{{'status':61, 'name' 16}} | {{'status':61, 'name':16}} | Colon missing. | Python |
WHERE id = '22' | WHERE id = 22 | Don't quote integer. | SQL |
let count = 'test' | let count = "test" | Double quotes. | Swift |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
if foo > 18
puts 'result' | if foo > 18
puts 'result'
end | Add 'end'. | Ruby |
<entry><name>hello</name><desc>84</desc></entry | <entry><name>hello</name><desc>84</desc></entry> | Add closing >. | XML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
'value' + 92 | 'value' + str(92) | Can't add int to string. | Python |
<ul><li>data<li>world</ul> | <ul><li>data</li><li>world</li></ul> | Close li. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if data = 72 {{}} | if data == 72 {{}} | Use ==. | Swift |
class Order {{ int b; }}; | class Order {{ public: int b; }}; | Make public. | C++ |
h1 {{ font-size:1px color:#fff; }} | h1 {{ font-size:1px; color:#fff; }} | Add semicolon. | CSS |
.Person {{ color: #fff; }} | .Person {{ color: #fff; }} | Correct. | CSS |
class Order {{ int temp; }}
obj.temp=5; | class Order {{ public int temp; }}
obj.temp=5; | Make field public. | Java |
let z: number | null = null; z.toFixed(62); | let z: number | null = null; if(z!==null) z.toFixed(62); | Null check. | TypeScript |
if num = 30 | if num == 30 | Use ==. | MATLAB |
if [ $a = 60 ]; then | if [ "$a" = 60 ]; then | Quote variable. | Shell |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
if (foo = 55) | if (foo == 55) | Use ==. | C++ |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.