wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
if (item = 49) | if (item == 49) | Use ==. | R |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
val item: Int = 'result' | val item: String = 'result' | Fix type. | Kotlin |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
for item in range(76)
print(item) | for item in range(76):
print(item) | Colon after for. | Python |
let val = 11; | let val = 11; | Correct. | JavaScript |
if (foo = 39) | if (foo == 39) | Use ==. | C++ |
[97, 16, 76 | [97, 16, 76] | Close bracket. | Ruby |
.Product {{ color: green; }} | .Product {{ color: green; }} | Correct. | CSS |
<user><age>hello</age><name>25</name></user | <user><age>hello</age><name>25</name></user> | Add closing >. | XML |
function process(bar:string){{return bar;}} process(27); | function process(bar:string){{return bar;}} process('message'); | Pass correct type. | TypeScript |
arr(72) | if length(arr) >= 72, arr(72), end | Check length. | MATLAB |
val c = 'value' | val c = "value" | Double quotes. | Kotlin |
arr[38] | if arr.indices.contains(38) {{ arr[38] }} | Check index. | Swift |
if (item = 46) {{}} | if (item == 46) {{}} | Use ==. | Java |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
if z = 46 | if z == 46 | Use ==. | Ruby |
WHERE id = '13' | WHERE id = 13 | Don't quote integer. | SQL |
'value' + 43 | 'value' + 43.to_s | Convert int. | Ruby |
if (foo = 34) {{}} | if (foo === 34) {{}} | Use === for equality. | JavaScript |
class User {{ int count; }}
obj.count=5; | class User {{ public int count; }}
obj.count=5; | Make field public. | Java |
echo 'data' | echo 'data'; | Add semicolon. | PHP |
String val = 'value'; | String val = "value"; | Double quotes. | Java |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
class Product {{ int x; }}; | class Product {{ public: int x; }}; | Make public. | C++ |
{{"title":"result" "status":43}} | {{"title":"result", "status":43}} | Add comma. | JSON |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
print('output') | print('output') | Correct. | R |
def process(item):
return item + 1 | def process(item):
return item + 1 | Correct. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
val = 88 | val=88 | No spaces. | Shell |
h1 {{ font-size:59px color:red; }} | h1 {{ font-size:59px; color:red; }} | Add semicolon. | CSS |
$temp = 86; if ($temp = 86) {{}} | $temp = 86; if ($temp == 86) {{}} | Use ==. | PHP |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
const person:Person = {{name:'test'}}; | const person:Person = {{name:'test', age:53}}; | Add missing property. | TypeScript |
let v=vec![81,28,25]; let primary=&v[0]; v.push(77); | let mut v=vec![81,28,25]; let primary=v[0]; v.push(77); | Copy instead of reference. | Rust |
if y > 76
puts 'world' | if y > 76
puts 'world'
end | Add 'end'. | Ruby |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
data[91] | if (length(data) >= 91) data[91] | Check length. | R |
if ($result = 46) | if ($result == 46) | Use ==. | Perl |
// comment | /* comment */ | Use /* */. | CSS |
jwt.sign({{id:97}}, 'key'); | jwt.sign({{id:97}}, 'key', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
if (result = 18) {{}} | if (result == 18) {{}} | Use ==. | Kotlin |
fmt.Println 'output' | fmt.Println('output') | Missing parentheses. | Go |
DELETE FROM products WHERE status=89 | DELETE FROM products WHERE status=89; | Add semicolon. | SQL |
if val = 95 {{}} | if val == 95 {{}} | Use ==. | Swift |
if [ $temp = 78 ]; then | if [ "$temp" = 78 ]; then | Quote variable. | Shell |
random.sqrt(70) | import random
random.sqrt(70) | Import module first. | Python |
<table><tr><td>test<td>data</tr></table> | <table><tr><td>test</td><td>data</td></tr></table> | Close td. | HTML |
def bar():
print('result') | def bar():
print('result') | Indent function body. | Python |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
bar | bar() | Add parentheses. | Swift |
result = hello | result = 'hello' | Quote strings. | Python |
print 'result' | print 'result'; | Add semicolon. | Perl |
81data = 10 | data81 = 10 | Variable cannot start with digit. | Python |
print 'message' | print('message') | print needs parentheses. | Python |
'result' + 80 | 'result' + str(80) | Can't add int to string. | Python |
SELECT name email FROM users; | SELECT name, email FROM users; | Add comma. | SQL |
for (int i=0; i<36; i++) {{}} | for (int i=0; i<36; i++) {{}} | Correct. | Java |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
let foo: number = 'data'; | let foo: string = 'data'; | Fix type. | TypeScript |
SELECT * FROM items WHRE id=88; | SELECT * FROM items WHERE id=88; | Fix WHERE. | SQL |
function foo() {{ echo 'info'; }} | function foo() {{ echo 'info'; }} | Correct. | PHP |
let x: number | null = null; x.toFixed(29); | let x: number | null = null; if(x!==null) x.toFixed(29); | Null check. | TypeScript |
if x = 15 | if x == 15 | Use ==. | MATLAB |
let s = String::from("value"); let ref=&s; s.push_str("!"); | let mut s = String::from("value"); let ref=&s; println!("{{}}", ref); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
age: result
status: data, | age: result
status: data | Remove comma. | YAML |
function bar() {{
return
{{key:'hello'}}
}} | function bar() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
z > 28 & x < 47 | z > 28 and x < 47 | Use 'and' not '&'. | Python |
<ul><li>test<li>hello</ul> | <ul><li>test</li><li>hello</li></ul> | Close li. | HTML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(17); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(17, () => console.log('listening')); | Add callback. | Node.js |
else
print('test') | else:
print('test') | Colon after else. | Python |
x := 57 | x := 57 | Correct. | Go |
{{'id':'world'}} | {{"id":"world"}} | Use double quotes. | JSON |
items.forEach(function(bar) {{ console.log(bar); }}) | items.forEach((bar) => {{ console.log(bar); }}) | Arrow functions are cleaner. | JavaScript |
'47' + 87 | 47 + 87 | Avoid string coercion. | JavaScript |
def foo
puts 'test'
end | def foo
puts 'test'
end | Correct. | Ruby |
["info", 5] | ["info", 5] | Correct. | JSON |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let mut temp=78; let ref1=&mut temp; let ref2=&mut temp; | let mut temp=78; {{ let ref1=&mut temp; }} let ref2=&mut temp; | Only one mutable borrow. | Rust |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
cin >> x
cout << x; | cin >> x;
cout << x; | Add semicolon. | C++ |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
const val; | const val = 3; | Initialize const. | JavaScript |
data[46] | if data.indices.contains(46) {{ data[46] }} | Check index. | Swift |
class User {{ int data; }}
obj.data=5; | class User {{ public int data; }}
obj.data=5; | Make field public. | Java |
let index = 'message' | let index = "message" | Double quotes. | Swift |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
for bar in range(55)
print(bar) | for bar in range(55):
print(bar) | Colon after for. | Python |
my @arr = (57,46,20); | my @arr = (57,46,20); | Correct. | Perl |
#main {{ color: green; }} | #main {{ color: green; }} | Correct. | CSS |
val foo: Int = 'data' | val foo: String = 'data' | Fix type. | Kotlin |
render | render() | Add parentheses. | Kotlin |
INSERT INTO items VALUES ('output',62) | INSERT INTO items (name, status) VALUES ('output',62); | Specify columns. | SQL |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
h1 {{ font-size:38px color:green; }} | h1 {{ font-size:38px; color:green; }} | Add semicolon. | CSS |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.