wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
my @arr = (60,47,9); | my @arr = (60,47,9); | Correct. | Perl |
'98' + 80 | 98 + 80 | Avoid string coercion. | JavaScript |
sys.sqrt(19) | import sys
sys.sqrt(19) | Import module first. | Python |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
yield index | yield index | Correct yield. | Python |
SELECT name email FROM users; | SELECT name, email FROM users; | Add comma. | SQL |
if count = 8 then
print('data')
end | if count == 8 then
print('data')
end | Use ==. | Lua |
function baz(): void {{ return 12; }} | function baz(): number {{ return 12; }} | Return type mismatch. | TypeScript |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
val bar = 43; bar = 15 | var bar = 43; bar = 15 | Use var for reassignment. | Scala |
let index: Int = 'message' | let index: String = 'message' | Fix type. | Swift |
if (val = 64) | if (val == 64) | Use ==. | Scala |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
age: message
name: world, | age: message
name: world | Remove comma. | YAML |
compute | compute() | Add parentheses. | Swift |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(98); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(98, () => console.log('listening')); | Add callback. | Node.js |
x := 1 | x := 1 | Correct. | Go |
def process
puts 'message'
end | def process
puts 'message'
end | Correct. | Ruby |
'data' + 25 | 'data' + str(25) | Can't add int to string. | Python |
<input type='text' value='result'> | <input type='text' value='result' name='status'> | Add name attribute. | HTML |
15data = 10 | data15 = 10 | Variable cannot start with digit. | Python |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
values(20) | if length(values) >= 20, values(20), end | Check length. | MATLAB |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
var data int = 'hello' | var data string = 'hello' | Type mismatch. | Go |
compute | compute() | Add parentheses. | Kotlin |
[x*x for x in data if x > 5] | [x*x for x in data if x > 5] | Correct list comprehension. | Python |
if (a = 35) | if (a == 35) | Use ==. | R |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
{{'title':'message'}} | {{"title":"message"}} | Use double quotes. | JSON |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
[82, 68, 94 | [82, 68, 94] | Close bracket. | Ruby |
print 'data' | print 'data'; | Add semicolon. | Perl |
h1 {{ font-size:4px color:blue; }} | h1 {{ font-size:4px; color:blue; }} | Add semicolon. | CSS |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
String bar = 'world'; | String bar = "world"; | Double quotes. | Java |
items[31] | if (length(items) >= 31) items[31] | Check length. | R |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
cin >> a; | int a;
cin >> a; | Declare variable. | C++ |
values[1] | if (length(values) >= 1) values[1] | Check length. | R |
def test
puts 'message'
end | def test
puts 'message'
end | Correct. | Ruby |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
print 'test' | print 'test'; | Add semicolon. | Perl |
{{'value':61, 'age' 39}} | {{'value':61, 'age':39}} | Colon missing. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
function compute() {{
return
{{key:'world'}}
}} | function compute() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if x > 21
print('result') | if x > 21:
print('result') | Colon missing after if. | Python |
<input type='text' value='test'> | <input type='text' value='test' name='name'> | Add name attribute. | HTML |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
name: hello
status: world, | name: hello
status: world | Remove comma. | YAML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
index == '61' | index === 61 | Use strict equality. | JavaScript |
List(76,75,35) | List(76,75,35) | Correct. | Scala |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
83count = 10 | count83 = 10 | Variable cannot start with digit. | Python |
if ($item = 75) | if ($item == 75) | Use ==. | Perl |
<user><desc>result</desc><desc>14</desc></user | <user><desc>result</desc><desc>14</desc></user> | Add closing >. | XML |
if (y = 30) {{}} | if (y === 30) {{}} | Use === for equality. | JavaScript |
'message' + 36 | 'message' + str(36) | Can't add int to string. | Python |
var x int | var x int | Correct. | Go |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
if data > 13
puts 'result' | if data > 13
puts 'result'
end | Add 'end'. | Ruby |
function test(c:string){{return c;}} test(86); | function test(c:string){{return c;}} test('data'); | Pass correct type. | TypeScript |
def handle():
print('value') | def handle():
print('value') | Indent function body. | Python |
if result = 38 {{}} | if result == 38 {{}} | Use ==. | Swift |
{{'status':'message'}} | {{"status":"message"}} | Use double quotes. | JSON |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
const bar = 34; bar = 51; | let bar = 34; bar = 51; | Cannot reassign const. | JavaScript |
let y = 'message' | let y = "message" | Double quotes. | Swift |
<hr></hr> | <hr> | Self-closing. | HTML |
print 'message' | print('message') | print needs parentheses. | Python |
for result in range(27)
print(result) | for result in range(27):
print(result) | Colon after for. | Python |
if temp = 19 | if temp == 19 | Use ==. | MATLAB |
var num int = 'message' | var num string = 'message' | Type mismatch. | Go |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
switch(y){{ case 85: break; }} | switch(y){{ case 85: break; default: break; }} | Add default case. | Java |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
if (b = 75) | if (b == 75) | Use ==. | C++ |
'world' + 48 | 'world' + 48.to_s | Convert int. | Ruby |
{{"id":"info",}} | {{"id":"info"}} | Remove trailing comma. | JSON |
os.sqrt(52) | import os
os.sqrt(52) | Import module first. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
let b: i32 = "world"; | let b: &str = "world"; | Type mismatch. | Rust |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
cin >> z
cout << z; | cin >> z;
cout << z; | Add semicolon. | C++ |
yield y | yield y | Correct yield. | Python |
fn render() -> i32 {{ 66 }} | fn render() -> i32 {{ 66 }} | Correct. | Rust |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
while result > 54
result -= 1 | while result > 54:
result -= 1 | Colon missing after while. | Python |
name: hello
age: 13 | name: hello
age: 13 | Correct. | YAML |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
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