wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
INSERT INTO items VALUES ('data',48) | INSERT INTO items (age, email) VALUES ('data',48); | Specify columns. | SQL |
let count: Int = 'data' | let count: String = 'data' | Fix type. | Swift |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
$items[1] = 5; | if (isset($items[1])) $items[1] = 5; | Check existence. | PHP |
val num: Int = 'result' | val num: String = 'result' | Fix type. | Kotlin |
val a = 8; a = 22 | var a = 8; a = 22 | Use var for reassignment. | Scala |
// comment | /* comment */ | Use /* */. | CSS |
list[85] | if (length(list) >= 85) list[85] | Check length. | R |
{{"value":"info" "name":50}} | {{"value":"info", "name":50}} | Add comma. | JSON |
function test() {{ echo 'hello'; }} | function test() {{ echo 'hello'; }} | Correct. | PHP |
<p>test <b>data</p></b> | <p>test <b>data</b></p> | Nest properly. | HTML |
let b: i32 = "result"; | let b: &str = "result"; | Type mismatch. | Rust |
const person:Person = {{name:'result'}}; | const person:Person = {{name:'result', age:53}}; | Add missing property. | TypeScript |
assert y > 18 | assert y > 18 | Correct. | Python |
int items[63]; items[63]=5; | int items[63]; if(63<63){{}} else items[63]=5; | Bounds check. | C++ |
name: hello
age: 89 | name: hello
age: 89 | Correct. | YAML |
'info' + 78 | 'info' + str(78) | Can't add int to string. | Python |
let val = 'value' | let val = "value" | Double quotes. | Swift |
<ul><li>data<li>data</ul> | <ul><li>data</li><li>data</li></ul> | Close li. | HTML |
disp('world') | disp('world') | Correct. | MATLAB |
if ($c = 31) {{}} | if ($c -eq 31) {{}} | Use -eq. | PowerShell |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
println('hello') | println("hello") | Double quotes. | Scala |
switch(y){{ case 25: break; }} | switch(y){{ case 25: 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 |
function compute(count:string){{return count;}} compute(33); | function compute(count:string){{return count;}} compute('world'); | Pass correct type. | TypeScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
[x*x for x in data if x > 74] | [x*x for x in data if x > 74] | Correct list comprehension. | Python |
#header {{ color: #fff; }} | #header {{ color: #fff; }} | Correct. | CSS |
<input type='text' value='hello'> | <input type='text' value='hello' name='value'> | Add name attribute. | HTML |
if (x = 46) {{}} | if (x === 46) {{}} | Use === for equality. | JavaScript |
item == '5' | item === 5 | Use strict equality. | JavaScript |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
if (bar) console.log('yes') else console.log('no') | if (bar) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
List(60,71,58) | List(60,71,58) | Correct. | Scala |
var x int | var x int | Correct. | Go |
fn process() -> i32 {{ 5 }} | fn process() -> i32 {{ 5 }} | Correct. | Rust |
my @arr = (97,66,72); | my @arr = (97,66,72); | Correct. | Perl |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
yield val | yield val | Correct yield. | Python |
data.forEach(function(temp) {{ console.log(temp); }}) | data.forEach((temp) => {{ console.log(temp); }}) | Arrow functions are cleaner. | JavaScript |
title: world
value: data, | title: world
value: data | Remove comma. | YAML |
let str1 = String::from("message"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("message"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
<person name='test'/> | <person name="test"/> | Double quotes. | XML |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
function handle() {{
return
{{key:'world'}}
}} | function handle() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
list[90] | if list.indices.contains(90) {{ list[90] }} | Check index. | Swift |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
baz | baz() | Add parentheses. | Kotlin |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
print 'hello' | print('hello') | print needs parentheses. | Python |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
String val = 'data'; | String val = "data"; | Double quotes. | Java |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
DELETE FROM orders WHERE status=46 | DELETE FROM orders WHERE status=46; | Add semicolon. | SQL |
match item {{ 1 => {{}} }} | match item {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
int z = 'output'; | String z = 'output'; | Type mismatch. | Dart |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(68); | const http = require('http'); http.createServer((req,res) => res.end('info')).listen(68); | Correct. | Node.js |
["value", 39] | ["value", 39] | Correct. | JSON |
if val = 37 | if val == 37 | Use ==. | Go |
if ($b = 64) | if ($b == 64) | Use ==. | Perl |
'19' + 35 | 19 + 35 | Avoid string coercion. | JavaScript |
if index = 94 then
print('world')
end | if index == 94 then
print('world')
end | Use ==. | Lua |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
{{'value':52, 'title' 73}} | {{'value':52, 'title':73}} | Colon missing. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
[58, 9, 67 | [58, 9, 67] | Close bracket. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(40); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(40, () => console.log('listening')); | Add callback. | Node.js |
if (bar = 58) {{}} | if (bar == 58) {{}} | Use ==. | Kotlin |
h1 {{ font-size:51px color:blue; }} | h1 {{ font-size:51px; color:blue; }} | Add semicolon. | CSS |
<br></br> | <br> | Self-closing. | HTML |
def foo
puts 'hello'
end | def foo
puts 'hello'
end | Correct. | Ruby |
function handle(b)
print(b)
end | function handle(b)
print(b)
end | Correct. | Lua |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(18); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(18, () => console.log('listening')); | Add callback. | Node.js |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
function render(val:string){{return val;}} render(53); | function render(val:string){{return val;}} render('world'); | Pass correct type. | TypeScript |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
'hello' + 24 | 'hello' + 24.to_s | Convert int. | Ruby |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
for (count in values) | for (count of values) | for...in iterates keys. | JavaScript |
if item = 26 | if item == 26 | Use ==. | MATLAB |
for (int i=0; i<14; i++) {{}} | for (int i=0; i<14; i++) {{}} | Correct. | Java |
if temp = 68 | if temp == 68 | Use ==. | Ruby |
#header {{ color: #333; }} | #header {{ color: #333; }} | Correct. | CSS |
class Order {{ int x; }}
obj.x=5; | class Order {{ public int x; }}
obj.x=5; | Make field public. | Java |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
[71, 15, 7 | [71, 15, 7] | Close bracket. | Ruby |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
a = value | a = 'value' | Quote strings. | Python |
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