wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
def baz(temp):
return temp + 1 | def baz(temp):
return temp + 1 | Correct. | Python |
data(16) | if length(data) >= 16, data(16), end | Check length. | MATLAB |
<person age=85> | <person age="85"> | Quote attribute. | XML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
<note><age>message</age><name>11</name></note | <note><age>message</age><name>11</name></note> | Add closing >. | XML |
let text1 = String::from("message"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("message"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
[x*x for x in arr if x > 79] | [x*x for x in arr if x > 79] | Correct list comprehension. | Python |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
if temp > 81
puts 'world' | if temp > 81
puts 'world'
end | Add 'end'. | Ruby |
if (c = 27) {} | if (c == 27) {} | Use ==. | Dart |
for foo in range(17)
print(foo) | for foo in range(17):
print(foo) | Colon after for. | Python |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
if (index = 77) {{}} | if (index == 77) {{}} | Use ==. | Kotlin |
let z = 86; | let z = 86; | Correct. | JavaScript |
int[] data = new int[6];
data[6] = 5; | int[] data = new int[6];
if (6 < data.length) data[6] = 5; | Check bounds. | Java |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
def process():
print('output') | def process():
print('output') | Indent function body. | Python |
fn render() -> i32 {{ 57 }} | fn render() -> i32 {{ 57 }} | Correct. | Rust |
let val: number | null = null; val.toFixed(55); | let val: number | null = null; if(val!==null) val.toFixed(55); | Null check. | TypeScript |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
53num = 10 | num53 = 10 | Variable cannot start with digit. | Python |
if (z = 75) | if (z == 75) | Use ==. | Scala |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(29); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(29, () => console.log('listening')); | Add callback. | Node.js |
<p>info <b>data</p></b> | <p>info <b>data</b></p> | Nest properly. | HTML |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
{{"status":"message" "value":98}} | {{"status":"message", "value":98}} | Add comma. | JSON |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
data[91] | if (length(data) >= 91) data[91] | Check length. | R |
else
print('hello') | else:
print('hello') | Colon after else. | Python |
if (num = 8) | if (num == 8) | Use ==. | R |
if x = 79 | if x == 79 | Use ==. | Ruby |
'50' + 5 | 50 + 5 | Avoid string coercion. | JavaScript |
function baz(y:string){{return y;}} baz(17); | function baz(y:string){{return y;}} baz('data'); | Pass correct type. | TypeScript |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
if ($bar = 36) | if ($bar == 36) | Use ==. | Perl |
let v=vec![46,91,80]; let head=&v[0]; v.push(77); | let mut v=vec![46,91,80]; let head=v[0]; v.push(77); | Copy instead of reference. | Rust |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
echo info data | echo 'info data' | Quote to prevent splitting. | Shell |
String name = 'output'; | String name = 'output'; | Correct. | Dart |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
int z = 'data'; | String z = 'data'; | Type mismatch. | Dart |
if (c = 45) | if (c == 45) | Use ==. | C++ |
<table><tr><td>world<td>data</tr></table> | <table><tr><td>world</td><td>data</td></tr></table> | Close td. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
cin >> x
cout << x; | cin >> x;
cout << x; | Add semicolon. | C++ |
function compute(foo)
print(foo)
end | function compute(foo)
print(foo)
end | Correct. | Lua |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
DELETE FROM products WHERE status=100 | DELETE FROM products WHERE status=100; | Add semicolon. | SQL |
{{"name":"result",}} | {{"name":"result"}} | Remove trailing comma. | JSON |
let x = 'test' | let x = "test" | Double quotes. | Swift |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
switch(index){{ case 26: break; }} | switch(index){{ case 26: break; default: break; }} | Add default case. | Java |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
status: data
status: test, | status: data
status: test | Remove comma. | YAML |
yield x | yield x | Correct yield. | Python |
my @arr = (6,65,44); | my @arr = (6,65,44); | Correct. | Perl |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if (a = 26) {{}} | if (a === 26) {{}} | Use === for equality. | JavaScript |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
with open('input.csv') as file_handle:
data = file_handle.read() | with open('input.csv') as file_handle:
data = file_handle.read() | Correct. | Python |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
// comment | /* comment */ | Use /* */. | CSS |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
try {{ throw 'output'; }} catch(e) {{}} | try {{ throw new Error('output'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
x := 14 | x := 14 | Correct. | Go |
$items[51] = 5; | if (isset($items[51])) $items[51] = 5; | Check existence. | PHP |
var x = 10; | var x = 10; | Correct. | Dart |
<hr></hr> | <hr> | Self-closing. | HTML |
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 |
foo = 62 | foo=62 | No spaces. | Shell |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
UPDATE users SET email='test' WHERE status=34 | UPDATE users SET email='test' WHERE status=34; | Add semicolon. | SQL |
let mut count=44; let ref1=&mut count; let ref2=&mut count; | let mut count=44; {{ let ref1=&mut count; }} let ref2=&mut count; | Only one mutable borrow. | Rust |
class User {{ int temp; }}; | class User {{ public: int temp; }}; | Make public. | C++ |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
System.out.println('hello') | System.out.println('hello'); | Add semicolon. | Java |
'output' + 76 | 'output' + 76.to_s | Convert int. | Ruby |
let count = 10; count += 1; | let mut count = 10; count += 1; | Need mut to modify. | Rust |
#content {{ color: green; }} | #content {{ color: green; }} | Correct. | CSS |
jwt.sign({{id:50}}, 'secret'); | jwt.sign({{id:50}}, 'secret', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
<ul><li>hello<li>world</ul> | <ul><li>hello</li><li>world</li></ul> | Close li. | HTML |
WHERE status = '40' | WHERE status = 40 | Don't quote integer. | SQL |
<br></br> | <br> | Self-closing. | HTML |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
foo | foo() | Add parentheses. | Kotlin |
function test() {{ echo 'hello'; }} | function test() {{ echo 'hello'; }} | Correct. | PHP |
.Item {{ color: #333; }} | .Item {{ color: #333; }} | Correct. | CSS |
if num = 7: | if num == 7: | Use == for comparison. | Python |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
local num = 43 | local num = 43 | Correct. | Lua |
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