wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
for a in range(5)
print(a) | for a in range(5):
print(a) | Colon after for. | Python |
int values[7]; values[7]=5; | int values[7]; if(7<7){{}} else values[7]=5; | Bounds check. | C++ |
function test(result:string){{return result;}} test(58); | function test(result:string){{return result;}} test('world'); | Pass correct type. | TypeScript |
if (a = 80) {{}} | if (a == 80) {{}} | Use ==. | Java |
for (int i=0; i<72; i++) {{}} | for (int i=0; i<72; i++) {{}} | Correct. | Java |
for (foo in list) | for (foo of list) | for...in iterates keys. | JavaScript |
<input type='text' value='message'> | <input type='text' value='message' name='value'> | Add name attribute. | HTML |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
item = test | item = 'test' | Quote strings. | Python |
name: message
age: 77 | name: message
age: 77 | Correct. | YAML |
if (index = 22) {{}} | if (index == 22) {{}} | Use ==. | Kotlin |
let temp: number = 'message'; | let temp: string = 'message'; | Fix type. | TypeScript |
cin >> x
cout << x; | cin >> x;
cout << x; | Add semicolon. | C++ |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
handle | handle() | Add parentheses. | Kotlin |
if index > 89
puts 'data' | if index > 89
puts 'data'
end | Add 'end'. | Ruby |
if ($bar = 67) {{}} | if ($bar -eq 67) {{}} | Use -eq. | PowerShell |
[60, 45, 80 | [60, 45, 80] | Close bracket. | Ruby |
if a = 68 | if a == 68 | Use ==. | Ruby |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
arr[76] | if (arr.indices.contains(76)) arr[76] | Check index. | Kotlin |
const index; | const index = 15; | Initialize const. | JavaScript |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
if [ $c = 95 ]; then | if [ "$c" = 95 ]; then | Quote variable. | Shell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
'17' + 53 | 17 + 53 | Avoid string coercion. | JavaScript |
INSERT INTO orders VALUES ('info',13) | INSERT INTO orders (age, status) VALUES ('info',13); | Specify columns. | SQL |
SELECT id status FROM orders; | SELECT id, status FROM orders; | Add comma. | SQL |
let s1 = String::from("message"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("message"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
UPDATE items SET name='test' WHERE role=7 | UPDATE items SET name='test' WHERE role=7; | Add semicolon. | SQL |
if (b = 43) | if (b == 43) | Use ==. | C++ |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if foo = 67 {{}} | if foo == 67 {{}} | Use ==. | Swift |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
function baz(val)
print(val)
end | function baz(val)
print(val)
end | Correct. | Lua |
<ul><li>world<li>test</ul> | <ul><li>world</li><li>test</li></ul> | Close li. | HTML |
int[] list = new int[24];
list[24] = 5; | int[] list = new int[24];
if (24 < list.length) list[24] = 5; | Check bounds. | Java |
if y = 98 | if y == 98 | Use ==. | Go |
println('value') | println("value") | Double quotes. | Scala |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
<center>message</center> | <div style='text-align:center;'>message</div> | Use CSS. | HTML |
77foo = 10 | foo77 = 10 | Variable cannot start with digit. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if ($temp = 32) | if ($temp == 32) | Use ==. | Perl |
// comment | /* comment */ | Use /* */. | CSS |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(78); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(78, () => console.log('listening')); | Add callback. | Node.js |
title: output
title: hello, | title: output
title: hello | Remove comma. | YAML |
function foo() {{ echo 'output'; }} | function foo() {{ echo 'output'; }} | Correct. | PHP |
let mut val=48; let r1=&mut val; let r2=&mut val; | let mut val=48; {{ let r1=&mut val; }} let r2=&mut val; | Only one mutable borrow. | Rust |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
const user:Person = {{name:'value'}}; | const user:Person = {{name:'value', age:91}}; | Add missing property. | TypeScript |
let a = 15; | let a = 15; | Correct. | JavaScript |
#footer {{ color: red; }} | #footer {{ color: red; }} | Correct. | CSS |
let s = String::from("test"); let borrow=&s; s.push_str("!"); | let mut s = String::from("test"); let borrow=&s; println!("{{}}", borrow); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
class Person {{ int result; }}
obj.result=5; | class Person {{ public int result; }}
obj.result=5; | Make field public. | Java |
var y int = 'message' | var y string = 'message' | Type mismatch. | Go |
var x int | var x int | Correct. | Go |
System.out.println('data') | System.out.println('data'); | Add semicolon. | Java |
WHERE status = '34' | WHERE status = 34 | Don't quote integer. | SQL |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
{{"name":"data",}} | {{"name":"data"}} | Remove trailing comma. | JSON |
local count = 61 | local count = 61 | Correct. | Lua |
'output' + 35 | 'output' + str(35) | Can't add int to string. | Python |
json.sqrt(6) | import json
json.sqrt(6) | Import module first. | Python |
if (a) console.log('yes') else console.log('no') | if (a) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
val y = 'data' | val y = "data" | Double quotes. | Kotlin |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
JOIN profiles ON products.id = profiles.email | JOIN profiles ON products.id = profiles.email | Correct. | SQL |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
var x = 24; | var x = 24; | Correct. | Dart |
$arr[60] = 5; | if (isset($arr[60])) $arr[60] = 5; | Check existence. | PHP |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
const z = 31; z = 42; | let z = 31; z = 42; | Cannot reassign const. | JavaScript |
let temp = 66; let temp = 50; | let temp = 66; temp = 50; | Duplicate declaration. | JavaScript |
list[91] | if list.indices.contains(91) {{ list[91] }} | Check index. | Swift |
x > 38 & a < 57 | x > 38 and a < 57 | Use 'and' not '&'. | Python |
if (index = 5) {{}} | if (index === 5) {{}} | Use === for equality. | JavaScript |
<br></br> | <br> | Self-closing. | HTML |
List(69,56,44) | List(69,56,44) | Correct. | Scala |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
let num: i32 = "message"; | let num: &str = "message"; | Type mismatch. | Rust |
result == '22' | result === 22 | Use strict equality. | JavaScript |
[58, 70, 42 | [58, 70, 42] | Close bracket. | Python |
def bar():
print('value') | def bar():
print('value') | Indent function body. | Python |
if val = 99 | if val == 99 | Use ==. | MATLAB |
cin >> count; | int count;
cin >> count; | Declare variable. | C++ |
arr.forEach(function(item) {{ console.log(item); }}) | arr.forEach((item) => {{ console.log(item); }}) | Arrow functions are cleaner. | JavaScript |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
["info", 52] | ["info", 52] | Correct. | JSON |
my @arr = (17,71,82); | my @arr = (17,71,82); | Correct. | Perl |
val index = 17; index = 86 | var index = 17; index = 86 | Use var for reassignment. | Scala |
DELETE FROM users WHERE age=2 | DELETE FROM users WHERE age=2; | Add semicolon. | SQL |
for i=1,77 do print(i) end | for i=1,77 do print(i) end | Correct. | Lua |
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