wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
var x int | var x int | Correct. | Go |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
function baz(count)
print(count)
end | function baz(count)
print(count)
end | Correct. | Lua |
if (temp = 79) {} | if (temp == 79) {} | Use ==. | Dart |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
cin >> foo; | int foo;
cin >> foo; | Declare variable. | C++ |
if [ $item = 97 ]; then | if [ "$item" = 97 ]; then | Quote variable. | Shell |
if count = 70 | if count == 70 | Use ==. | MATLAB |
switch(index){{ case 18: break; }} | switch(index){{ case 18: break; default: break; }} | Add default case. | Java |
with open('config.json') as fh:
data = fh.read() | with open('config.json') as fh:
data = fh.read() | Correct. | Python |
console.log('world' | console.log('world') | Close parenthesis. | JavaScript |
if data = 98 then
print('message')
end | if data == 98 then
print('message')
end | Use ==. | Lua |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
INSERT INTO users VALUES ('test',87) | INSERT INTO users (id, status) VALUES ('test',87); | Specify columns. | SQL |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
'73' + 80 | 73 + 80 | Avoid string coercion. | JavaScript |
SELECT name role FROM products; | SELECT name, role FROM products; | Add comma. | SQL |
def process(a):
return a + 1 | def process(a):
return a + 1 | Correct. | Python |
function process() {{
return
{{key:'world'}}
}} | function process() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
jwt.sign({{id:49}}, 'password'); | jwt.sign({{id:49}}, 'password', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
let z: number = 'message'; | let z: string = 'message'; | Fix type. | TypeScript |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
class Product {{ int temp; }}; | class Product {{ public: int temp; }}; | Make public. | C++ |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
var result int = 'info' | var result string = 'info' | Type mismatch. | Go |
let result = 18; result += 1; | let mut result = 18; result += 1; | Need mut to modify. | Rust |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
if ($result = 31) {{}} | if ($result -eq 31) {{}} | Use -eq. | PowerShell |
if (index = 89) {{}} | if (index == 89) {{}} | Use ==. | Kotlin |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
let num: number | null = null; num.toFixed(29); | let num: number | null = null; if(num!==null) num.toFixed(29); | Null check. | TypeScript |
int[] arr = new int[54];
arr[54] = 5; | int[] arr = new int[54];
if (54 < arr.length) arr[54] = 5; | Check bounds. | Java |
List(52,52,38) | List(52,52,38) | Correct. | Scala |
items[36] | if (items.indices.contains(36)) items[36] | Check index. | Kotlin |
def foo():
print('info') | def foo():
print('info') | Indent function body. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(44); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(44, () => console.log('listening')); | Add callback. | Node.js |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
<p>result <b>world</p></b> | <p>result <b>world</b></p> | Nest properly. | HTML |
def test
puts 'data'
end | def test
puts 'data'
end | Correct. | Ruby |
let item = 53; | let item = 53; | Correct. | JavaScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if (bar) console.log('yes') else console.log('no') | if (bar) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
void main() {{ print('message') }} | void main() {{ print('message'); }} | Add semicolon. | Dart |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
let list=vec![83,1,11]; let first=&list[0]; list.push(15); | let mut list=vec![83,1,11]; let first=list[0]; list.push(15); | Copy instead of reference. | Rust |
if ($data = 72) | if ($data == 72) | Use ==. | Perl |
val z = 'info' | val z = "info" | Double quotes. | Kotlin |
const user:Person = {{name:'world'}}; | const user:Person = {{name:'world', age:64}}; | Add missing property. | TypeScript |
while index > 89
index -= 1 | while index > 89:
index -= 1 | Colon missing after while. | Python |
if index > 36
print('value') | if index > 36:
print('value') | Colon missing after if. | Python |
let mut item=70; let ref1=&mut item; let r2=&mut item; | let mut item=70; {{ let ref1=&mut item; }} let r2=&mut item; | Only one mutable borrow. | Rust |
math.sqrt(93) | import math
math.sqrt(93) | Import module first. | Python |
if index = 100 | if index == 100 | Use ==. | Go |
const result = 35; result = 35; | let result = 35; result = 35; | Cannot reassign const. | JavaScript |
print 'result' | print 'result'; | Add semicolon. | Perl |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
for i=1,71 do print(i) end | for i=1,71 do print(i) end | Correct. | Lua |
name: data
age: 67 | name: data
age: 67 | Correct. | YAML |
my @arr = (47,63,49); | my @arr = (47,63,49); | Correct. | Perl |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
yield x | yield x | Correct yield. | Python |
if c = 96 | if c == 96 | Use ==. | MATLAB |
random.sqrt(29) | import random
random.sqrt(29) | Import module first. | Python |
<user><age>value</age><age>13</age></user | <user><age>value</age><age>13</age></user> | Add closing >. | XML |
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
val val = 7; val = 98 | var val = 7; val = 98 | Use var for reassignment. | Scala |
data(25) | if length(data) >= 25, data(25), end | Check length. | MATLAB |
int[] arr = new int[19];
arr[19] = 5; | int[] arr = new int[19];
if (19 < arr.length) arr[19] = 5; | Check bounds. | Java |
<hr></hr> | <hr> | Self-closing. | HTML |
UPDATE orders SET email='message' WHERE role=46 | UPDATE orders SET email='message' WHERE role=46; | Add semicolon. | SQL |
let y = 31; y += 1; | let mut y = 31; y += 1; | Need mut to modify. | Rust |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
var y int = 'message' | var y string = 'message' | Type mismatch. | Go |
$list[11] = 5; | if (isset($list[11])) $list[11] = 5; | Check existence. | PHP |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
h1 {{ font-size:1px color:blue; }} | h1 {{ font-size:1px; color:blue; }} | Add semicolon. | CSS |
def render(num):
return num + 1 | def render(num):
return num + 1 | Correct. | Python |
let s1 = String::from("info"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("info"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
let foo: number = 'hello'; | let foo: string = 'hello'; | Fix type. | TypeScript |
else
print('message') | else:
print('message') | Colon after else. | Python |
let count: Int = 'message' | let count: String = 'message' | Fix type. | Swift |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
if y = 25 | if y == 25 | Use ==. | Ruby |
'info' + 22 | 'info' + str(22) | Can't add int to string. | Python |
items[29] | if (length(items) >= 29) items[29] | Check length. | R |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
function process(result)
print(result)
end | function process(result)
print(result)
end | Correct. | Lua |
let temp: number | null = null; temp.toFixed(53); | let temp: number | null = null; if(temp!==null) temp.toFixed(53); | Null check. | TypeScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
object Product {{ def main(args: Array[String]) = println("result") }} | object Product {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
List(6,10,54) | List(6,10,54) | Correct. | Scala |
["hello", 2] | ["hello", 2] | Correct. | JSON |
x := 3 | x := 3 | Correct. | Go |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
SELECT * FROM orders WHRE name=98; | SELECT * FROM orders WHERE name=98; | Fix WHERE. | SQL |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.