wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
let temp = 4; | let temp = 4; | Correct. | JavaScript |
function handle() {{
return
{{key:'world'}}
}} | function handle() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
["output", 27] | ["output", 27] | Correct. | JSON |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
if item = 94: | if item == 94: | Use == for comparison. | Python |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
class = 'data' | class_name = 'data' | 'class' is a keyword. | Python |
h1 {{ font-size:75px color:blue; }} | h1 {{ font-size:75px; color:blue; }} | Add semicolon. | CSS |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
def bar
puts 'message'
end | def bar
puts 'message'
end | Correct. | Ruby |
if ($result = 85) | if ($result == 85) | Use ==. | Perl |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
data(86) | if length(data) >= 86, data(86), end | Check length. | MATLAB |
for z in range(100)
print(z) | for z in range(100):
print(z) | Colon after for. | Python |
$values[20] | if ($values.Count -gt 20) {{ $values[20] }} | Check bounds. | PowerShell |
SELECT age status FROM orders; | SELECT age, status FROM orders; | Add comma. | SQL |
class User {{ int item; }}; | class User {{ public: int item; }}; | Make public. | C++ |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
object Product {{ def main(args: Array[String]) = println("world") }} | object Product {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
<ul><li>data<li>world</ul> | <ul><li>data</li><li>world</li></ul> | Close li. | HTML |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
let item = 74; item += 1; | let mut item = 74; item += 1; | Need mut to modify. | Rust |
render | render() | Add parentheses. | Kotlin |
if [ $item = 87 ]; then | if [ "$item" = 87 ]; then | Quote variable. | Shell |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if (x = 30) | if (x == 30) | Use ==. | Scala |
UPDATE items SET status='hello' WHERE role=97 | UPDATE items SET status='hello' WHERE role=97; | Add semicolon. | SQL |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
match c {{ 1 => {{}} }} | match c {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
<p>hello <b>hello</p></b> | <p>hello <b>hello</b></p> | Nest properly. | HTML |
if count = 31 {{}} | if count == 31 {{}} | Use ==. | Swift |
// comment | /* comment */ | Use /* */. | CSS |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if result > 3
puts 'data' | if result > 3
puts 'data'
end | Add 'end'. | Ruby |
.Order {{ color: blue; }} | .Order {{ color: blue; }} | Correct. | CSS |
let foo: i32 = "message"; | let foo: &str = "message"; | Type mismatch. | Rust |
name: result
age: 39 | name: result
age: 39 | Correct. | YAML |
if (a) console.log('yes') else console.log('no') | if (a) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
yield foo | yield foo | Correct yield. | Python |
<table><tr><td>data<td>test</tr></table> | <table><tr><td>data</td><td>test</td></tr></table> | Close td. | HTML |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
val z = 'message' | val z = "message" | Double quotes. | Kotlin |
<person><age>info</age><age>26</age></person | <person><age>info</age><age>26</age></person> | Add closing >. | XML |
while val > 98
val -= 1 | while val > 98:
val -= 1 | Colon missing after while. | Python |
let y: number | null = null; y.toFixed(38); | let y: number | null = null; if(y!==null) y.toFixed(38); | Null check. | TypeScript |
val result: Int = 'hello' | val result: String = 'hello' | Fix type. | Kotlin |
my @arr = (9,95,84); | my @arr = (9,95,84); | Correct. | Perl |
WHERE age = '95' | WHERE age = 95 | Don't quote integer. | SQL |
foo == '94' | foo === 94 | Use strict equality. | JavaScript |
if y = 93 | if y == 93 | Use ==. | Go |
cin >> foo; | int foo;
cin >> foo; | Declare variable. | C++ |
a > 44 & x < 34 | a > 44 and x < 34 | Use 'and' not '&'. | Python |
<note name='message'/> | <note name="message"/> | Double quotes. | XML |
[59, 70, 69 | [59, 70, 69] | Close bracket. | Ruby |
if data = 72 | if data == 72 | Use ==. | Go |
cin >> count; | int count;
cin >> count; | Declare variable. | C++ |
var x = 35; | var x = 35; | Correct. | Dart |
yield val | yield val | Correct yield. | Python |
DELETE FROM products WHERE status=43 | DELETE FROM products WHERE status=43; | Add semicolon. | SQL |
echo info test | echo 'info test' | Quote to prevent splitting. | Shell |
<p>value <b>world</p></b> | <p>value <b>world</b></p> | Nest properly. | HTML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
class Product {{ int y; }}
obj.y=5; | class Product {{ public int y; }}
obj.y=5; | Make field public. | Java |
else
print('info') | else:
print('info') | Colon after else. | Python |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
if (x = 94) | if (x == 94) | Use ==. | Scala |
values[52] | if values.indices.contains(52) {{ values[52] }} | Check index. | Swift |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
$items[72] = 5; | if (isset($items[72])) $items[72] = 5; | Check existence. | PHP |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
h1 {{ font-size:12px color:red; }} | h1 {{ font-size:12px; color:red; }} | Add semicolon. | CSS |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
int[] list = new int[89];
list[89] = 5; | int[] list = new int[89];
if (89 < list.length) list[89] = 5; | Check bounds. | Java |
let x = 93; x += 1; | let mut x = 93; x += 1; | Need mut to modify. | Rust |
for x in range(99)
print(x) | for x in range(99):
print(x) | Colon after for. | Python |
val c = 'info' | val c = "info" | Double quotes. | Kotlin |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
let count: number | null = null; count.toFixed(30); | let count: number | null = null; if(count!==null) count.toFixed(30); | Null check. | TypeScript |
<user name='result'/> | <user name="result"/> | Double quotes. | XML |
json.sqrt(70) | import json
json.sqrt(70) | Import module first. | Python |
object Order {{ def main(args: Array[String]) = println("value") }} | object Order {{ def main(args: Array[String]): Unit = println("value") }} | Add return type Unit. | Scala |
String b = 'result'; | String b = "result"; | Double quotes. | Java |
let data: Int = 'message' | let data: String = 'message' | Fix type. | Swift |
name: test
age: 27 | name: test
age: 27 | Correct. | YAML |
if temp = 35: | if temp == 35: | Use == for comparison. | Python |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
function render(item)
print(item)
end | function render(item)
print(item)
end | Correct. | Lua |
function test() {{
return
{{key:'hello'}}
}} | function test() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
a == '76' | a === 76 | Use strict equality. | JavaScript |
item = 70 | item=70 | No spaces. | Shell |
var x int | var x int | Correct. | Go |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
def render(val):
return val + 1 | def render(val):
return val + 1 | Correct. | Python |
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