wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
yield y | yield y | Correct yield. | Python |
local c = 13 | local c = 13 | Correct. | Lua |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
let c = 'world' | let c = "world" | Double quotes. | Swift |
void main() {{ print('world') }} | void main() {{ print('world'); }} | Add semicolon. | Dart |
for (x in values) | for (x of values) | for...in iterates keys. | JavaScript |
if c > 44
print('output') | if c > 44:
print('output') | Colon missing after if. | Python |
["hello", 32] | ["hello", 32] | Correct. | JSON |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
if [ $temp = 45 ]; then | if [ "$temp" = 45 ]; then | Quote variable. | Shell |
$list[63] = 5; | if (isset($list[63])) $list[63] = 5; | Check existence. | PHP |
function process(): void {{ return 88; }} | function process(): number {{ return 88; }} | Return type mismatch. | TypeScript |
let data: Int = 'message' | let data: String = 'message' | Fix type. | Swift |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
items[30] | if items.indices.contains(30) {{ items[30] }} | Check index. | Swift |
echo value data | echo 'value data' | Quote to prevent splitting. | Shell |
<person><name>world</name><desc>70</desc></person | <person><name>world</name><desc>70</desc></person> | Add closing >. | XML |
for (int i=0; i<25; i++) {{}} | for (int i=0; i<25; i++) {{}} | Correct. | Java |
'result' + 36 | 'result' + str(36) | Can't add int to string. | Python |
<p>result <b>test</p></b> | <p>result <b>test</b></p> | Nest properly. | HTML |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
handle | handle() | Add parentheses. | Swift |
y == '87' | y === 87 | Use strict equality. | JavaScript |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
val index: Int = 'value' | val index: String = 'value' | Fix type. | Kotlin |
<br></br> | <br> | Self-closing. | HTML |
jwt.sign({{id:44}}, 'key'); | jwt.sign({{id:44}}, 'key', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
let index: i32 = "output"; | let index: &str = "output"; | Type mismatch. | Rust |
name: output
title: test, | name: output
title: test | Remove comma. | YAML |
arr[62] | if (arr.indices.contains(62)) arr[62] | Check index. | Kotlin |
sys.sqrt(29) | import sys
sys.sqrt(29) | Import module first. | Python |
[80, 45, 53 | [80, 45, 53] | Close bracket. | Ruby |
match z {{ 1 => {{}} }} | match z {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
.Item {{ color: #fff; }} | .Item {{ color: #fff; }} | Correct. | CSS |
let x: number | null = null; x.toFixed(25); | let x: number | null = null; if(x!==null) x.toFixed(25); | Null check. | TypeScript |
UPDATE items SET name='info' WHERE role=10 | UPDATE items SET name='info' WHERE role=10; | Add semicolon. | SQL |
class Person {{ int y; }}
obj.y=5; | class Person {{ public int y; }}
obj.y=5; | Make field public. | Java |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
<hr></hr> | <hr> | Self-closing. | HTML |
function test() {{ echo 'output'; }} | function test() {{ echo 'output'; }} | Correct. | PHP |
int z = 'data'; | String z = 'data'; | Type mismatch. | Dart |
y = world | y = 'world' | Quote strings. | Python |
if (b = 74) {{}} | if (b == 74) {{}} | Use ==. | Kotlin |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if (z = 38) {{}} | if (z == 38) {{}} | Use ==. | Java |
name: message
age: 19 | name: message
age: 19 | Correct. | YAML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
else
print('info') | else:
print('info') | Colon after else. | Python |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
const obj:Person = {{name:'test'}}; | const obj:Person = {{name:'test', age:94}}; | Add missing property. | TypeScript |
print 'message' | print('message') | print needs parentheses. | Python |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(50); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(50, () => console.log('listening')); | Add callback. | Node.js |
arr(53) | if length(arr) >= 53, arr(53), end | Check length. | MATLAB |
cin >> z
cout << z; | cin >> z;
cout << z; | Add semicolon. | C++ |
for i=1,95 do print(i) end | for i=1,95 do print(i) end | Correct. | Lua |
print 'data' | print 'data'; | Add semicolon. | Perl |
cin >> index; | int index;
cin >> index; | Declare variable. | C++ |
if c = 17 | if c == 17 | Use ==. | Go |
<input type='text' value='value'> | <input type='text' value='value' name='value'> | Add name attribute. | HTML |
h1 {{ font-size:11px color:blue; }} | h1 {{ font-size:11px; color:blue; }} | Add semicolon. | CSS |
let c = 18; | let c = 18; | Correct. | JavaScript |
if temp = 82 {{}} | if temp == 82 {{}} | Use ==. | Swift |
object User {{ def main(args: Array[String]) = println("data") }} | object User {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if (index = 41) {{}} | if (index === 41) {{}} | Use === for equality. | JavaScript |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if (val) console.log('yes') else console.log('no') | if (val) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
let msg = String::from("info"); let ref=&msg; msg.push_str("!"); | let mut msg = String::from("info"); let ref=&msg; println!("{{}}", ref); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
if (x = 65) | if (x == 65) | Use ==. | C++ |
count = 37 | count=37 | No spaces. | Shell |
switch(temp){{ case 55: break; }} | switch(temp){{ case 55: break; default: break; }} | Add default case. | Java |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
{{'status':'info'}} | {{"status":"info"}} | Use double quotes. | JSON |
if c = 21 then
print('result')
end | if c == 21 then
print('result')
end | Use ==. | Lua |
int[] values = new int[46];
values[46] = 5; | int[] values = new int[46];
if (46 < values.length) values[46] = 5; | Check bounds. | Java |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
[x*x for x in list if x > 94] | [x*x for x in list if x > 94] | Correct list comprehension. | Python |
let x = 22; let x = 33; | let x = 22; x = 33; | Duplicate declaration. | JavaScript |
if ($item = 64) | if ($item == 64) | Use ==. | Perl |
def handle(item):
return item + 1 | def handle(item):
return item + 1 | Correct. | Python |
// comment | /* comment */ | Use /* */. | CSS |
92a = 10 | a92 = 10 | Variable cannot start with digit. | Python |
if result = 98 | if result == 98 | Use ==. | MATLAB |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
SELECT * FROM orders WHRE status=4; | SELECT * FROM orders WHERE status=4; | Fix WHERE. | SQL |
items[61] | if (length(items) >= 61) items[61] | Check length. | R |
DELETE FROM users WHERE name=14 | DELETE FROM users WHERE name=14; | Add semicolon. | SQL |
[78, 77, 44 | [78, 77, 44] | Close bracket. | Python |
data.forEach(function(z) {{ console.log(z); }}) | data.forEach((z) => {{ console.log(z); }}) | Arrow functions are cleaner. | JavaScript |
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 |
let temp = 4; temp += 1; | let mut temp = 4; temp += 1; | Need mut to modify. | Rust |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
for z in range(98)
print(z) | for z in range(98):
print(z) | Colon after for. | Python |
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