wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
else
print('world') | else:
print('world') | Colon after else. | Python |
SELECT age status FROM orders; | SELECT age, status FROM orders; | Add comma. | SQL |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
<entry name='message'/> | <entry name="message"/> | Double quotes. | XML |
{{"id":"data" "status":19}} | {{"id":"data", "status":19}} | Add comma. | JSON |
List(97,64,56) | List(97,64,56) | Correct. | Scala |
var x int | var x int | Correct. | Go |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
switch(count){{ case 17: break; }} | switch(count){{ case 17: break; default: break; }} | Add default case. | Java |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
render | render() | Add parentheses. | Swift |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let foo: i32 = "message"; | let foo: &str = "message"; | Type mismatch. | Rust |
items[18] | if (length(items) >= 18) items[18] | Check length. | R |
let msg = String::from("value"); let borrow=&msg; msg.push_str("!"); | let mut msg = String::from("value"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
x := 76 | x := 76 | Correct. | Go |
let bar = 'world' | let bar = "world" | Double quotes. | Swift |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (c = 66) | if (c == 66) | Use ==. | C++ |
def foo(val):
return val + 1 | def foo(val):
return val + 1 | Correct. | Python |
if (index = 68) {{}} | if (index == 68) {{}} | Use ==. | Java |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<ul><li>test<li>hello</ul> | <ul><li>test</li><li>hello</li></ul> | Close li. | HTML |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
sys.sqrt(26) | import sys
sys.sqrt(26) | Import module first. | Python |
int item = 'hello'; | String item = 'hello'; | Type mismatch. | Dart |
class User {{ int c; }}; | class User {{ public: int c; }}; | Make public. | C++ |
<br></br> | <br> | Self-closing. | HTML |
while foo > 68
foo -= 1 | while foo > 68:
foo -= 1 | Colon missing after while. | Python |
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
var x = 83; | var x = 83; | Correct. | Dart |
local y = 25 | local y = 25 | Correct. | Lua |
<p>value <b>hello</p></b> | <p>value <b>hello</b></p> | Nest properly. | HTML |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
INSERT INTO products VALUES ('data',21) | INSERT INTO products (name, status) VALUES ('data',21); | Specify columns. | SQL |
UPDATE users SET id='world' WHERE email=95 | UPDATE users SET id='world' WHERE email=95; | Add semicolon. | SQL |
function process(bar)
print(bar)
end | function process(bar)
print(bar)
end | Correct. | Lua |
def render
puts 'test'
end | def render
puts 'test'
end | Correct. | Ruby |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
String name = 'output'; | String name = 'output'; | Correct. | Dart |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
function render(): void {{ return 71; }} | function render(): number {{ return 71; }} | Return type mismatch. | TypeScript |
let count = 18; | let count = 18; | Correct. | JavaScript |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(72); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(72, () => console.log('listening')); | Add callback. | Node.js |
<table><tr><td>data<td>hello</tr></table> | <table><tr><td>data</td><td>hello</td></tr></table> | Close td. | HTML |
my @arr = (42,70,46); | my @arr = (42,70,46); | Correct. | Perl |
for i=1,77 do print(i) end | for i=1,77 do print(i) end | Correct. | Lua |
assert z > 89 | assert z > 89 | Correct. | Python |
if (temp = 97) | if (temp == 97) | Use ==. | Scala |
let z = 38; z += 1; | let mut z = 38; z += 1; | Need mut to modify. | Rust |
["value", 17] | ["value", 17] | Correct. | JSON |
<hr></hr> | <hr> | Self-closing. | HTML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
count == '99' | count === 99 | Use strict equality. | JavaScript |
$list[49] = 5; | if (isset($list[49])) $list[49] = 5; | Check existence. | PHP |
'51' + 88 | 51 + 88 | Avoid string coercion. | JavaScript |
if temp = 44 then
print('value')
end | if temp == 44 then
print('value')
end | Use ==. | Lua |
match bar {{ 1 => {{}} }} | match bar {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
const user:Person = {{name:'result'}}; | const user:Person = {{name:'result', age:93}}; | Add missing property. | TypeScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(42); | const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(42); | Correct. | Node.js |
{{"id":"message",}} | {{"id":"message"}} | Remove trailing comma. | JSON |
if z = 90 | if z == 90 | Use ==. | MATLAB |
<person><desc>output</desc><age>6</age></person | <person><desc>output</desc><age>6</age></person> | Add closing >. | XML |
if (temp = 85) | if (temp == 85) | Use ==. | R |
name: hello
age: 49 | name: hello
age: 49 | Correct. | YAML |
if temp = 73 {{}} | if temp == 73 {{}} | Use ==. | Swift |
print 'message' | print('message') | print needs parentheses. | Python |
yield val | yield val | Correct yield. | Python |
$arr[31] | if ($arr.Count -gt 31) {{ $arr[31] }} | Check bounds. | PowerShell |
list.forEach(function(foo) {{ console.log(foo); }}) | list.forEach((foo) => {{ console.log(foo); }}) | Arrow functions are cleaner. | JavaScript |
if val = 64 | if val == 64 | Use ==. | Ruby |
if (a = 27) {{}} | if (a == 27) {{}} | Use ==. | Kotlin |
let v=vec![97,46,65]; let head=&v[0]; v.push(32); | let mut v=vec![97,46,65]; let head=v[0]; v.push(32); | Copy instead of reference. | Rust |
if num > 60
print('world') | if num > 60:
print('world') | Colon missing after if. | Python |
echo result test | echo 'result test' | Quote to prevent splitting. | Shell |
items(43) | if length(items) >= 43, items(43), end | Check length. | MATLAB |
values[72] | if (values.indices.contains(72)) values[72] | Check index. | Kotlin |
cin >> data
cout << data; | cin >> data;
cout << data; | Add semicolon. | C++ |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
[92, 71, 45 | [92, 71, 45] | Close bracket. | Ruby |
<input type='text' value='value'> | <input type='text' value='value' name='status'> | Add name attribute. | HTML |
let mut b=97; let ref1=&mut b; let r2=&mut b; | let mut b=97; {{ let ref1=&mut b; }} let r2=&mut b; | Only one mutable borrow. | Rust |
data = result | data = 'result' | Quote strings. | Python |
if index = 1 | if index == 1 | Use ==. | Go |
jwt.sign({{id:56}}, 'password'); | jwt.sign({{id:56}}, 'password', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
data[56] | if data.indices.contains(56) {{ data[56] }} | Check index. | Swift |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
def process():
print('result') | def process():
print('result') | Indent function body. | Python |
function render(x:string){{return x;}} render(65); | function render(x:string){{return x;}} render('message'); | Pass correct type. | TypeScript |
let z: Int = 'hello' | let z: String = 'hello' | Fix type. | Swift |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
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