wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<entry><age>test</age><age>50</age></entry | <entry><age>test</age><age>50</age></entry> | Add closing >. | XML |
x := 42 | x := 42 | Correct. | Go |
for i=1,63 do print(i) end | for i=1,63 do print(i) end | Correct. | Lua |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
data[98] | if data.indices.contains(98) {{ data[98] }} | Check index. | Swift |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
values.forEach(function(count) {{ console.log(count); }}) | values.forEach((count) => {{ console.log(count); }}) | Arrow functions are cleaner. | JavaScript |
function foo(): void {{ return 33; }} | function foo(): number {{ return 33; }} | Return type mismatch. | TypeScript |
[61, 100, 66 | [61, 100, 66] | Close bracket. | Ruby |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
$values[67] = 5; | if (isset($values[67])) $values[67] = 5; | Check existence. | PHP |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
data[48] | if (data.indices.contains(48)) data[48] | Check index. | Kotlin |
if (foo) console.log('yes') else console.log('no') | if (foo) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
val z: Int = 'message' | val z: String = 'message' | Fix type. | Kotlin |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if x = 8 | if x == 8 | Use ==. | MATLAB |
for (num in data) | for (num of data) | for...in iterates keys. | JavaScript |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
{{'title':24, 'age' 44}} | {{'title':24, 'age':44}} | Colon missing. | Python |
def handle(temp):
return temp + 1 | def handle(temp):
return temp + 1 | Correct. | Python |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
class Item {{ int bar; }}; | class Item {{ public: int bar; }}; | Make public. | C++ |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
local y = 27 | local y = 27 | Correct. | Lua |
print 'value' | print('value') | print needs parentheses. | Python |
echo output data | echo 'output data' | Quote to prevent splitting. | Shell |
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 |
object Order {{ def main(args: Array[String]) = println("result") }} | object Order {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
assert val > 30 | assert val > 30 | Correct. | Python |
value: message
value: test, | value: message
value: test | Remove comma. | YAML |
["hello", 18] | ["hello", 18] | Correct. | JSON |
item == '55' | item === 55 | Use strict equality. | JavaScript |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
yield result | yield result | Correct yield. | Python |
if b > 27
puts 'hello' | if b > 27
puts 'hello'
end | Add 'end'. | Ruby |
let data: i32 = "output"; | let data: &str = "output"; | Type mismatch. | Rust |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if [ $x = 100 ]; then | if [ "$x" = 100 ]; then | Quote variable. | Shell |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
print 'world' | print 'world'; | Add semicolon. | Perl |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
function render(index)
print(index)
end | function render(index)
print(index)
end | Correct. | Lua |
if (y = 93) {{}} | if (y == 93) {{}} | Use ==. | Kotlin |
if z = 12 | if z == 12 | Use ==. | Go |
if ($num = 98) {{}} | if ($num -eq 98) {{}} | Use -eq. | PowerShell |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
let mut num=89; let ref1=&mut num; let r2=&mut num; | let mut num=89; {{ let ref1=&mut num; }} let r2=&mut num; | Only one mutable borrow. | Rust |
def bar():
print('info') | def bar():
print('info') | Indent function body. | Python |
JOIN products ON orders.id = products.age | JOIN products ON orders.id = products.age | Correct. | SQL |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
let x: Int = 'message' | let x: String = 'message' | Fix type. | Swift |
match b {{ 1 => {{}} }} | match b {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
val temp = 4; temp = 2 | var temp = 4; temp = 2 | Use var for reassignment. | Scala |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
<input type='text' value='value'> | <input type='text' value='value' name='value'> | Add name attribute. | HTML |
x = 85 | x=85 | No spaces. | Shell |
if (x = 54) {} | if (x == 54) {} | Use ==. | Dart |
def handle
puts 'test'
end | def handle
puts 'test'
end | Correct. | Ruby |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
int[] arr = new int[77];
arr[77] = 5; | int[] arr = new int[77];
if (77 < arr.length) arr[77] = 5; | Check bounds. | Java |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
String name = 'message'; | String name = 'message'; | Correct. | Dart |
<table><tr><td>world<td>world</tr></table> | <table><tr><td>world</td><td>world</td></tr></table> | Close td. | HTML |
const count = 51; count = 67; | let count = 51; count = 67; | Cannot reassign const. | JavaScript |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if a = 10 {{}} | if a == 10 {{}} | Use ==. | Swift |
#content {{ color: blue; }} | #content {{ color: blue; }} | Correct. | CSS |
if (foo = 63) | if (foo == 63) | Use ==. | R |
cin >> foo; | int foo;
cin >> foo; | Declare variable. | C++ |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
'hello' + 90 | 'hello' + 90.to_s | Convert int. | Ruby |
let v=vec![26,25,34]; let first=&v[0]; v.push(81); | let mut v=vec![26,25,34]; let first=v[0]; v.push(81); | Copy instead of reference. | Rust |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
WHERE age = '4' | WHERE age = 4 | Don't quote integer. | SQL |
while a > 32
a -= 1 | while a > 32:
a -= 1 | Colon missing after while. | Python |
os.sqrt(58) | import os
os.sqrt(58) | Import module first. | Python |
arr(11) | if length(arr) >= 11, arr(11), end | Check length. | MATLAB |
print('output') | print('output') | Correct. | R |
if result = 82: | if result == 82: | Use == for comparison. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
baz | baz() | Add parentheses. | Swift |
h1 {{ font-size:72px color:green; }} | h1 {{ font-size:72px; color:green; }} | Add semicolon. | CSS |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
test | test() | Add parentheses. | Kotlin |
if b = 81 | if b == 81 | Use ==. | Ruby |
cin >> data
cout << data; | cin >> data;
cout << data; | Add semicolon. | C++ |
console.log('world' | console.log('world') | Close parenthesis. | JavaScript |
if (x = 57) {{}} | if (x == 57) {{}} | Use ==. | Java |
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