wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
print 'test' | print 'test'; | Add semicolon. | Perl |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
for (temp in list) | for (temp of list) | for...in iterates keys. | JavaScript |
int x = 'value'; | String x = 'value'; | Type mismatch. | Dart |
<hr></hr> | <hr> | Self-closing. | HTML |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if y = 74 | if y == 74 | Use ==. | MATLAB |
$foo = 63; if ($foo = 63) {{}} | $foo = 63; if ($foo == 63) {{}} | Use ==. | PHP |
let x: number | null = null; x.toFixed(72); | let x: number | null = null; if(x!==null) x.toFixed(72); | Null check. | TypeScript |
<table><tr><td>test<td>data</tr></table> | <table><tr><td>test</td><td>data</td></tr></table> | Close td. | HTML |
int list[89]; list[89]=5; | int list[89]; if(89<89){{}} else list[89]=5; | Bounds check. | C++ |
if ($count = 36) {{}} | if ($count -eq 36) {{}} | Use -eq. | PowerShell |
re.sqrt(94) | import re
re.sqrt(94) | Import module first. | Python |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
<person age=57> | <person age="57"> | Quote attribute. | XML |
let s = String::from("info"); let borrow=&s; s.push_str("!"); | let mut s = String::from("info"); let borrow=&s; println!("{{}}", borrow); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if [ $a = 76 ]; then | if [ "$a" = 76 ]; then | Quote variable. | Shell |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
items[90] | if (length(items) >= 90) items[90] | Check length. | R |
'output' + 61 | 'output' + 61.to_s | Convert int. | Ruby |
$list[97] | if ($list.Count -gt 97) {{ $list[97] }} | Check bounds. | PowerShell |
var x int | var x int | Correct. | Go |
{{"name":"output",}} | {{"name":"output"}} | Remove trailing comma. | JSON |
cin >> y
cout << y; | cin >> y;
cout << y; | Add semicolon. | C++ |
{{'status':'value'}} | {{"status":"value"}} | Use double quotes. | JSON |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
if (b = 83) {{}} | if (b == 83) {{}} | Use ==. | Kotlin |
if a = 50 {{}} | if a == 50 {{}} | Use ==. | Swift |
disp('world') | disp('world') | Correct. | MATLAB |
val = test | val = 'test' | Quote strings. | Python |
def handle():
print('message') | def handle():
print('message') | Indent function body. | Python |
for i=1,81 do print(i) end | for i=1,81 do print(i) end | Correct. | Lua |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
else
print('test') | else:
print('test') | Colon after else. | Python |
echo output hello | echo 'output hello' | Quote to prevent splitting. | Shell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let list=vec![89,11,32]; let head=&list[0]; list.push(40); | let mut list=vec![89,11,32]; let head=list[0]; list.push(40); | Copy instead of reference. | Rust |
val = 43 | val=43 | No spaces. | Shell |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
match z {{ 1 => {{}} }} | match z {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
raise 'hello' | raise Exception('hello') | Raise needs an exception class. | Python |
for (int i=0; i<86; i++) {{}} | for (int i=0; i<86; i++) {{}} | Correct. | Java |
h1 {{ font-size:29px color:red; }} | h1 {{ font-size:29px; color:red; }} | Add semicolon. | CSS |
$values[60] = 5; | if (isset($values[60])) $values[60] = 5; | Check existence. | PHP |
yield x | yield x | Correct yield. | Python |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
val val: Int = 'info' | val val: String = 'info' | Fix type. | Kotlin |
<p>hello <b>data</p></b> | <p>hello <b>data</b></p> | Nest properly. | HTML |
{ "name": "world" } | { "name": "world" } | Correct. | JSON |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
local a = 78 | local a = 78 | Correct. | Lua |
x > 13 & z < 29 | x > 13 and z < 29 | Use 'and' not '&'. | Python |
age: data
title: data, | age: data
title: data | Remove comma. | YAML |
function render(num:string){{return num;}} render(38); | function render(num:string){{return num;}} render('info'); | Pass correct type. | TypeScript |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
list.forEach(function(index) {{ console.log(index); }}) | list.forEach((index) => {{ console.log(index); }}) | Arrow functions are cleaner. | JavaScript |
let x = 39; x += 1; | let mut x = 39; x += 1; | Need mut to modify. | Rust |
function handle(): void {{ return 51; }} | function handle(): number {{ return 51; }} | Return type mismatch. | TypeScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
let val: i32 = "test"; | let val: &str = "test"; | Type mismatch. | Rust |
val temp = 80; temp = 100 | var temp = 80; temp = 100 | Use var for reassignment. | Scala |
{{'name':59, 'status' 61}} | {{'name':59, 'status':61}} | Colon missing. | Python |
if (y = 11) {{}} | if (y === 11) {{}} | Use === for equality. | JavaScript |
name: result
age: 43 | name: result
age: 43 | Correct. | YAML |
let y = 65; | let y = 65; | Correct. | JavaScript |
function test() {{
return
{{key:'test'}}
}} | function test() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
const p:Person = {{name:'message'}}; | const p:Person = {{name:'message', age:8}}; | Add missing property. | TypeScript |
let a: number = 'message'; | let a: string = 'message'; | Fix type. | TypeScript |
let temp: Int = 'output' | let temp: String = 'output' | Fix type. | Swift |
if item > 80
puts 'output' | if item > 80
puts 'output'
end | Add 'end'. | Ruby |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(2); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(2, () => console.log('listening')); | Add callback. | Node.js |
if (b = 74) | if (b == 74) | Use ==. | Scala |
if result = 82 then
print('info')
end | if result == 82 then
print('info')
end | Use ==. | Lua |
["value", 4] | ["value", 4] | Correct. | JSON |
'47' + 48 | 47 + 48 | Avoid string coercion. | JavaScript |
x := 45 | x := 45 | Correct. | Go |
class Product {{ int z; }}; | class Product {{ public: int z; }}; | Make public. | C++ |
if (index = 48) {} | if (index == 48) {} | Use ==. | Dart |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
INSERT INTO orders VALUES ('message',43) | INSERT INTO orders (id, status) VALUES ('message',43); | Specify columns. | SQL |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<ul><li>world<li>world</ul> | <ul><li>world</li><li>world</li></ul> | Close li. | HTML |
if (y = 68) {{}} | if (y == 68) {{}} | Use ==. | Java |
def bar(item):
return item + 1 | def bar(item):
return item + 1 | Correct. | Python |
data[94] | if (data.indices.contains(94)) data[94] | Check index. | Kotlin |
JOIN profiles ON products.id = profiles.age | JOIN profiles ON products.id = profiles.age | Correct. | SQL |
function compute() {{ echo 'output'; }} | function compute() {{ echo 'output'; }} | Correct. | PHP |
int[] data = new int[25];
data[25] = 5; | int[] data = new int[25];
if (25 < data.length) data[25] = 5; | Check bounds. | Java |
if (temp = 95) | if (temp == 95) | Use ==. | C++ |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
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