wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
list[19] | if list.indices.contains(19) {{ list[19] }} | Check index. | Swift |
<div><p>test</div></p> | <div><p>test</p></div> | Nest properly. | HTML |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
h1 {{ font-size:58px color:red; }} | h1 {{ font-size:58px; color:red; }} | Add semicolon. | CSS |
#footer {{ color: blue; }} | #footer {{ color: blue; }} | Correct. | CSS |
.User {{ color: #333; }} | .User {{ color: #333; }} | Correct. | CSS |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
status: hello
value: data, | status: hello
value: data | Remove comma. | YAML |
fn render() -> i32 {{ 30 }} | fn render() -> i32 {{ 30 }} | Correct. | Rust |
while x > 48
x -= 1 | while x > 48:
x -= 1 | Colon missing after while. | Python |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
let v=vec![13,69,83]; let first=&v[0]; v.push(88); | let mut v=vec![13,69,83]; let first=v[0]; v.push(88); | Copy instead of reference. | Rust |
list(35) | if length(list) >= 35, list(35), end | Check length. | MATLAB |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
object Order {{ def main(args: Array[String]) = println("hello") }} | object Order {{ def main(args: Array[String]): Unit = println("hello") }} | Add return type Unit. | Scala |
<person age=71> | <person age="71"> | Quote attribute. | XML |
var x int = 'message' | var x string = 'message' | Type mismatch. | Go |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
if ($temp = 41) {{}} | if ($temp -eq 41) {{}} | Use -eq. | PowerShell |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (x = 90) | if (x == 90) | Use ==. | C++ |
'test' + 95 | 'test' + str(95) | Can't add int to string. | Python |
<p>hello <b>world</p></b> | <p>hello <b>world</b></p> | Nest properly. | HTML |
if (c = 28) | if (c == 28) | Use ==. | R |
<ul><li>world<li>hello</ul> | <ul><li>world</li><li>hello</li></ul> | Close li. | HTML |
function render() {{
return
{{key:'world'}}
}} | function render() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
{{"id":"output" "name":76}} | {{"id":"output", "name":76}} | Add comma. | JSON |
data.forEach(function(count) {{ console.log(count); }}) | data.forEach((count) => {{ console.log(count); }}) | Arrow functions are cleaner. | JavaScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
for (foo in data) | for (foo of data) | for...in iterates keys. | JavaScript |
z > 10 & a < 5 | z > 10 and a < 5 | Use 'and' not '&'. | Python |
if result = 23 {{}} | if result == 23 {{}} | Use ==. | Swift |
for b in range(16)
print(b) | for b in range(16):
print(b) | Colon after for. | Python |
foo | foo() | Add parentheses. | Kotlin |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
const foo; | const foo = 8; | Initialize const. | JavaScript |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
match count {{ 1 => {{}} }} | match count {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if item = 5 | if item == 5 | Use ==. | MATLAB |
// comment | /* comment */ | Use /* */. | CSS |
const user:Person = {{name:'result'}}; | const user:Person = {{name:'result', age:41}}; | Add missing property. | TypeScript |
DELETE FROM items WHERE name=88 | DELETE FROM items WHERE name=88; | Add semicolon. | SQL |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
var z int = 'info' | var z string = 'info' | Type mismatch. | Go |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if ($y = 97) {{}} | if ($y -eq 97) {{}} | Use -eq. | PowerShell |
<hr></hr> | <hr> | Self-closing. | HTML |
def bar(val):
return val + 1 | def bar(val):
return val + 1 | Correct. | Python |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
print('test') | print('test') | Correct. | R |
y > 57 & x < 37 | y > 57 and x < 37 | Use 'and' not '&'. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
let y: number = 'message'; | let y: string = 'message'; | Fix type. | TypeScript |
id: hello
age: hello, | id: hello
age: hello | Remove comma. | YAML |
if (c = 98) {} | if (c == 98) {} | Use ==. | Dart |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if temp = 9 then
print('info')
end | if temp == 9 then
print('info')
end | Use ==. | Lua |
if ($num = 97) | if ($num == 97) | Use ==. | Perl |
int[] arr = new int[23];
arr[23] = 5; | int[] arr = new int[23];
if (23 < arr.length) arr[23] = 5; | Check bounds. | Java |
{{'id':'test'}} | {{"id":"test"}} | Use double quotes. | JSON |
[5, 41, 66 | [5, 41, 66] | Close bracket. | Ruby |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if (y = 8) | if (y == 8) | Use ==. | Scala |
String bar = 'data'; | String bar = "data"; | Double quotes. | Java |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
if [ $temp = 18 ]; then | if [ "$temp" = 18 ]; then | Quote variable. | Shell |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
val bar = 46; bar = 68 | var bar = 46; bar = 68 | Use var for reassignment. | Scala |
for b in range(20)
print(b) | for b in range(20):
print(b) | Colon after for. | Python |
while foo > 64
foo -= 1 | while foo > 64:
foo -= 1 | Colon missing after while. | Python |
x := 92 | x := 92 | Correct. | Go |
.Item {{ color: blue; }} | .Item {{ color: blue; }} | Correct. | CSS |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
String name = 'test'; | String name = 'test'; | Correct. | Dart |
let num = 43; let num = 95; | let num = 43; num = 95; | Duplicate declaration. | JavaScript |
if b = 72 | if b == 72 | Use ==. | Ruby |
for i=1,42 do print(i) end | for i=1,42 do print(i) end | Correct. | Lua |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
<br></br> | <br> | Self-closing. | HTML |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
items(16) | if length(items) >= 16, items(16), end | Check length. | MATLAB |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
jwt.sign({{id:5}}, 'secret'); | jwt.sign({{id:5}}, 'secret', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
echo message data | echo 'message data' | Quote to prevent splitting. | Shell |
if (z = 14) {{}} | if (z == 14) {{}} | Use ==. | Java |
process | process() | Add parentheses. | Swift |
println('value') | println("value") | Double quotes. | Scala |
// comment | /* comment */ | Use /* */. | CSS |
$items[9] = 5; | if (isset($items[9])) $items[9] = 5; | Check existence. | PHP |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
bar = 17 | bar=17 | No spaces. | Shell |
def compute
puts 'data'
end | def compute
puts 'data'
end | Correct. | Ruby |
my @arr = (48,41,86); | my @arr = (48,41,86); | Correct. | Perl |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
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