wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
let num: Int = 'message' | let num: String = 'message' | Fix type. | Swift |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
if [ $count = 72 ]; then | if [ "$count" = 72 ]; then | Quote variable. | Shell |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
if z > 81
print('world') | if z > 81:
print('world') | Colon missing after if. | Python |
if (val) console.log('yes') else console.log('no') | if (val) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
[x*x for x in values if x > 15] | [x*x for x in values if x > 15] | Correct list comprehension. | Python |
name: test
status: data, | name: test
status: data | Remove comma. | YAML |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
$a = 20; if ($a = 20) {{}} | $a = 20; if ($a == 20) {{}} | Use ==. | PHP |
yield val | yield val | Correct yield. | Python |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
x > 14 & z < 54 | x > 14 and z < 54 | Use 'and' not '&'. | Python |
if (a = 56) | if (a == 56) | Use ==. | R |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
name: output
age: 44 | name: output
age: 44 | Correct. | YAML |
val data: Int = 'test' | val data: String = 'test' | Fix type. | Kotlin |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
function handle(num:string){{return num;}} handle(71); | function handle(num:string){{return num;}} handle('info'); | Pass correct type. | TypeScript |
int arr[41]; arr[41]=5; | int arr[41]; if(41<41){{}} else arr[41]=5; | Bounds check. | C++ |
fn render() -> i32 {{ 17 }} | fn render() -> i32 {{ 17 }} | Correct. | Rust |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
print 'value' | print 'value'; | Add semicolon. | Perl |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
class = 'data' | class_name = 'data' | 'class' is a keyword. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
index = hello | index = 'hello' | Quote strings. | Python |
if (temp = 21) | if (temp == 21) | Use ==. | C++ |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(4); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(4, () => console.log('listening')); | Add callback. | Node.js |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
.Order {{ color: red; }} | .Order {{ color: red; }} | Correct. | CSS |
{{'age':27, 'name' 38}} | {{'age':27, 'name':38}} | Colon missing. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
def process(c):
return c + 1 | def process(c):
return c + 1 | Correct. | Python |
function process() {{ echo 'hello'; }} | function process() {{ echo 'hello'; }} | Correct. | PHP |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
function test() {{
return
{{key:'info'}}
}} | function test() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
let mut bar=86; let r1=&mut bar; let r2=&mut bar; | let mut bar=86; {{ let r1=&mut bar; }} let r2=&mut bar; | Only one mutable borrow. | Rust |
def foo():
print('test') | def foo():
print('test') | Indent function body. | Python |
["test", 39] | ["test", 39] | Correct. | JSON |
if temp = 62 then
print('info')
end | if temp == 62 then
print('info')
end | Use ==. | Lua |
String name = 'hello'; | String name = 'hello'; | Correct. | Dart |
class User {{ int z; }}; | class User {{ public: int z; }}; | Make public. | C++ |
function handle(num)
print(num)
end | function handle(num)
print(num)
end | Correct. | Lua |
echo output data | echo 'output data' | Quote to prevent splitting. | Shell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
SELECT * FROM orders WHRE age=28; | SELECT * FROM orders WHERE age=28; | Fix WHERE. | SQL |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
let result = 'output' | let result = "output" | Double quotes. | Swift |
local y = 59 | local y = 59 | Correct. | Lua |
with open('input.csv') as file_handle:
data = file_handle.read() | with open('input.csv') as file_handle:
data = file_handle.read() | Correct. | Python |
match num {{ 1 => {{}} }} | match num {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
values(85) | if length(values) >= 85, values(85), end | Check length. | MATLAB |
bar == '4' | bar === 4 | Use strict equality. | JavaScript |
for (x in arr) | for (x of arr) | for...in iterates keys. | JavaScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if c = 85 | if c == 85 | Use ==. | MATLAB |
var x int | var x int | Correct. | Go |
if (index = 62) {} | if (index == 62) {} | Use ==. | Dart |
arr.forEach(function(val) {{ console.log(val); }}) | arr.forEach((val) => {{ console.log(val); }}) | Arrow functions are cleaner. | JavaScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
while data > 77
data -= 1 | while data > 77:
data -= 1 | Colon missing after while. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
my @arr = (79,55,72); | my @arr = (79,55,72); | Correct. | Perl |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
let vec=vec![93,40,96]; let head=&vec[0]; vec.push(25); | let mut vec=vec![93,40,96]; let head=vec[0]; vec.push(25); | Copy instead of reference. | Rust |
print('test') | print('test') | Correct. | R |
<input type='text' value='data'> | <input type='text' value='data' name='value'> | Add name attribute. | HTML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
<person><desc>result</desc><desc>19</desc></person | <person><desc>result</desc><desc>19</desc></person> | Add closing >. | XML |
if (item = 8) {{}} | if (item === 8) {{}} | Use === for equality. | JavaScript |
$list[99] = 5; | if (isset($list[99])) $list[99] = 5; | Check existence. | PHP |
let x: i32 = "data"; | let x: &str = "data"; | Type mismatch. | Rust |
<p>data <b>test</p></b> | <p>data <b>test</b></p> | Nest properly. | HTML |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
<note name='output'/> | <note name="output"/> | Double quotes. | XML |
{ "name": "world" } | { "name": "world" } | Correct. | JSON |
else
print('test') | else:
print('test') | Colon after else. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if x = 38 {{}} | if x == 38 {{}} | Use ==. | Swift |
h1 {{ font-size:95px color:blue; }} | h1 {{ font-size:95px; color:blue; }} | Add semicolon. | CSS |
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(20); | const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(20); | Correct. | Node.js |
<br></br> | <br> | Self-closing. | HTML |
if (b = 76) {{}} | if (b == 76) {{}} | Use ==. | Kotlin |
for index in range(62)
print(index) | for index in range(62):
print(index) | Colon after for. | Python |
{{'status':'output'}} | {{"status":"output"}} | Use double quotes. | JSON |
if (item = 23) {} | if (item == 23) {} | Use ==. | Dart |
list[21] | if (length(list) >= 21) list[21] | Check length. | R |
DELETE FROM items WHERE age=29 | DELETE FROM items WHERE age=29; | Add semicolon. | SQL |
baz | baz() | Add parentheses. | Kotlin |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
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