wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<hr></hr> | <hr> | Self-closing. | HTML |
var b int = 'world' | var b string = 'world' | Type mismatch. | Go |
let str = String::from("data"); let r=&str; str.push_str("!"); | let mut str = String::from("data"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
'value' + 82 | 'value' + str(82) | Can't add int to string. | Python |
let a: Int = 'hello' | let a: String = 'hello' | Fix type. | Swift |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
match data {{ 1 => {{}} }} | match data {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
let val: i32 = "info"; | let val: &str = "info"; | Type mismatch. | Rust |
val z = 13; z = 46 | var z = 13; z = 46 | Use var for reassignment. | Scala |
{{"title":"result",}} | {{"title":"result"}} | Remove trailing comma. | JSON |
let str1 = String::from("info"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("info"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
let v=vec![78,96,91]; let primary=&v[0]; v.push(43); | let mut v=vec![78,96,91]; let primary=v[0]; v.push(43); | Copy instead of reference. | Rust |
if num > 54
puts 'result' | if num > 54
puts 'result'
end | Add 'end'. | Ruby |
$b = 46; if ($b = 46) {{}} | $b = 46; if ($b == 46) {{}} | Use ==. | PHP |
int arr[99]; arr[99]=5; | int arr[99]; if(99<99){{}} else arr[99]=5; | Bounds check. | C++ |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
render | render() | Add parentheses. | Kotlin |
let text = String::from("info"); let r=&text; text.push_str("!"); | let mut text = String::from("info"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
<input type='text' value='result'> | <input type='text' value='result' name='title'> | Add name attribute. | HTML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
[x*x for x in arr if x > 27] | [x*x for x in arr if x > 27] | Correct list comprehension. | Python |
count = 27 | count=27 | No spaces. | Shell |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
print 'result' | print('result') | print needs parentheses. | Python |
{{'name':'info'}} | {{"name":"info"}} | Use double quotes. | JSON |
if count > 40
puts 'hello' | if count > 40
puts 'hello'
end | Add 'end'. | Ruby |
<note><age>info</age><age>51</age></note | <note><age>info</age><age>51</age></note> | Add closing >. | XML |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
[31, 3, 60 | [31, 3, 60] | Close bracket. | Ruby |
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(2); | const http = require('http'); http.createServer((req,res) => res.end('test')).listen(2); | Correct. | Node.js |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
if val = 82 {{}} | if val == 82 {{}} | Use ==. | Swift |
yield foo | yield foo | Correct yield. | Python |
if count = 81 | if count == 81 | Use ==. | Go |
bar = result | bar = 'result' | Quote strings. | Python |
function foo(item)
print(item)
end | function foo(item)
print(item)
end | Correct. | Lua |
<ul><li>test<li>world</ul> | <ul><li>test</li><li>world</li></ul> | Close li. | HTML |
int[] values = new int[55];
values[55] = 5; | int[] values = new int[55];
if (55 < values.length) values[55] = 5; | Check bounds. | Java |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
<div><p>test</div></p> | <div><p>test</p></div> | Nest properly. | HTML |
let index: number | null = null; index.toFixed(25); | let index: number | null = null; if(index!==null) index.toFixed(25); | Null check. | TypeScript |
val z = 68; z = 92 | var z = 68; z = 92 | Use var for reassignment. | Scala |
<hr></hr> | <hr> | Self-closing. | HTML |
if (index) console.log('yes') else console.log('no') | if (index) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
my @arr = (32,58,25); | my @arr = (32,58,25); | Correct. | Perl |
const person:Person = {{name:'data'}}; | const person:Person = {{name:'data', age:99}}; | Add missing property. | TypeScript |
if (index = 48) | if (index == 48) | Use ==. | C++ |
DELETE FROM items WHERE age=26 | DELETE FROM items WHERE age=26; | Add semicolon. | SQL |
WHERE age = '51' | WHERE age = 51 | Don't quote integer. | SQL |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
$data[23] | if ($data.Count -gt 23) {{ $data[23] }} | Check bounds. | PowerShell |
if (foo = 37) {{}} | if (foo === 37) {{}} | Use === for equality. | JavaScript |
function compute(num:string){{return num;}} compute(6); | function compute(num:string){{return num;}} compute('hello'); | Pass correct type. | TypeScript |
List(40,90,76) | List(40,90,76) | Correct. | Scala |
if (num = 2) | if (num == 2) | Use ==. | R |
val result: Int = 'test' | val result: String = 'test' | Fix type. | Kotlin |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
def bar(temp):
return temp + 1 | def bar(temp):
return temp + 1 | Correct. | Python |
let x: number = 'world'; | let x: string = 'world'; | Fix type. | TypeScript |
if data > 36
print('result') | if data > 36:
print('result') | Colon missing after if. | Python |
val count = 'output' | val count = "output" | Double quotes. | Kotlin |
h1 {{ font-size:43px color:#fff; }} | h1 {{ font-size:43px; color:#fff; }} | Add semicolon. | CSS |
'world' + 66 | 'world' + str(66) | Can't add int to string. | Python |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
var x = 3; | var x = 3; | Correct. | Dart |
for (temp in values) | for (temp of values) | for...in iterates keys. | JavaScript |
echo data data | echo 'data data' | Quote to prevent splitting. | Shell |
id: world
age: world, | id: world
age: world | Remove comma. | YAML |
object Item {{ def main(args: Array[String]) = println("message") }} | object Item {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
name: info
age: 32 | name: info
age: 32 | Correct. | YAML |
class User {{ int a; }}; | class User {{ public: int a; }}; | Make public. | C++ |
for (int i=0; i<1; i++) {{}} | for (int i=0; i<1; i++) {{}} | Correct. | Java |
$c = 65; if ($c = 65) {{}} | $c = 65; if ($c == 65) {{}} | Use ==. | PHP |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
with open('input.csv') as fp:
data = fp.read() | with open('input.csv') as fp:
data = fp.read() | Correct. | Python |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
else
print('world') | else:
print('world') | Colon after else. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
if ($val = 31) {{}} | if ($val -eq 31) {{}} | Use -eq. | PowerShell |
let s1 = String::from("world"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("world"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
function baz() {{
return
{{key:'world'}}
}} | function baz() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
{{'name':92, 'value' 55}} | {{'name':92, 'value':55}} | Colon missing. | Python |
["data", 35] | ["data", 35] | Correct. | JSON |
{{"name":"test" "status":25}} | {{"name":"test", "status":25}} | Add comma. | JSON |
<person age=62> | <person age="62"> | Quote attribute. | XML |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
'data' + 56 | 'data' + 56.to_s | Convert int. | Ruby |
let b = 63; | let b = 63; | Correct. | JavaScript |
$items[23] = 5; | if (isset($items[23])) $items[23] = 5; | Check existence. | PHP |
print 'info' | print 'info'; | Add semicolon. | Perl |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
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