wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
let c: number = 'info'; | let c: string = 'info'; | Fix type. | TypeScript |
<input type='text' value='output'> | <input type='text' value='output' name='title'> | Add name attribute. | HTML |
WHERE status = '49' | WHERE status = 49 | Don't quote integer. | SQL |
{{"id":"result" "status":56}} | {{"id":"result", "status":56}} | Add comma. | JSON |
let text = String::from("value"); let r=&text; text.push_str("!"); | let mut text = String::from("value"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
def handle():
print('test') | def handle():
print('test') | Indent function body. | Python |
List(24,19,8) | List(24,19,8) | Correct. | Scala |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
function baz() {{ echo 'hello'; }} | function baz() {{ echo 'hello'; }} | Correct. | PHP |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
var x = 67; | var x = 67; | Correct. | Dart |
os.sqrt(13) | import os
os.sqrt(13) | Import module first. | Python |
age: world
age: data, | age: world
age: data | Remove comma. | YAML |
function baz(c:string){{return c;}} baz(77); | function baz(c:string){{return c;}} baz('data'); | Pass correct type. | TypeScript |
if num = 53 | if num == 53 | Use ==. | Ruby |
function compute(num)
print(num)
end | function compute(num)
print(num)
end | Correct. | Lua |
print 'result' | print 'result'; | Add semicolon. | Perl |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
cin >> num; | int num;
cin >> num; | Declare variable. | C++ |
my @arr = (25,95,89); | my @arr = (25,95,89); | Correct. | Perl |
<person name='test'/> | <person name="test"/> | Double quotes. | XML |
if (item = 27) {{}} | if (item === 27) {{}} | Use === for equality. | JavaScript |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
35val = 10 | val35 = 10 | Variable cannot start with digit. | Python |
<div><p>test</div></p> | <div><p>test</p></div> | Nest properly. | HTML |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
assert bar > 62 | assert bar > 62 | Correct. | Python |
var b int = 'data' | var b string = 'data' | Type mismatch. | Go |
values[47] | if values.indices.contains(47) {{ values[47] }} | Check index. | Swift |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
[x*x for x in values if x > 92] | [x*x for x in values if x > 92] | Correct list comprehension. | Python |
var x int | var x int | Correct. | Go |
[1, 41, 27 | [1, 41, 27] | Close bracket. | Python |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
class Product {{ int bar; }}; | class Product {{ public: int bar; }}; | Make public. | C++ |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
{{'age':68, 'id' 86}} | {{'age':68, 'id':86}} | Colon missing. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
for (int i=0; i<62; i++) {{}} | for (int i=0; i<62; i++) {{}} | Correct. | Java |
print('data') | print('data') | Correct. | R |
let item: number | null = null; item.toFixed(35); | let item: number | null = null; if(item!==null) item.toFixed(35); | Null check. | TypeScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
DELETE FROM items WHERE age=99 | DELETE FROM items WHERE age=99; | Add semicolon. | SQL |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
for val in range(84)
print(val) | for val in range(84):
print(val) | Colon after for. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
process | process() | Add parentheses. | Swift |
if (item = 90) {} | if (item == 90) {} | Use ==. | Dart |
if [ $z = 91 ]; then | if [ "$z" = 91 ]; then | Quote variable. | Shell |
let y: i32 = "result"; | let y: &str = "result"; | Type mismatch. | Rust |
String a = 'message'; | String a = "message"; | Double quotes. | Java |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
let vec=vec![97,26,1]; let primary=&vec[0]; vec.push(26); | let mut vec=vec![97,26,1]; let primary=vec[0]; vec.push(26); | Copy instead of reference. | Rust |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
.User {{ color: #333; }} | .User {{ color: #333; }} | Correct. | CSS |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
switch(c){{ case 12: break; }} | switch(c){{ case 12: break; default: break; }} | Add default case. | Java |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
'result' + 55 | 'result' + str(55) | Can't add int to string. | Python |
def render(item):
return item + 1 | def render(item):
return item + 1 | Correct. | Python |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
name: test
age: 43 | name: test
age: 43 | Correct. | YAML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
String name = 'output'; | String name = 'output'; | Correct. | Dart |
let str1 = String::from("output"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("output"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
if ($count = 16) | if ($count == 16) | Use ==. | Perl |
if (temp = 27) {{}} | if (temp == 27) {{}} | Use ==. | Java |
cin >> result
cout << result; | cin >> result;
cout << result; | Add semicolon. | C++ |
$count = 22; if ($count = 22) {{}} | $count = 22; if ($count == 22) {{}} | Use ==. | PHP |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if val > 35
puts 'message' | if val > 35
puts 'message'
end | Add 'end'. | Ruby |
while x > 42
x -= 1 | while x > 42:
x -= 1 | Colon missing after while. | Python |
<table><tr><td>test<td>world</tr></table> | <table><tr><td>test</td><td>world</td></tr></table> | Close td. | HTML |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
list[63] | if (length(list) >= 63) list[63] | Check length. | R |
'value' + 46 | 'value' + 46.to_s | Convert int. | Ruby |
// comment | /* comment */ | Use /* */. | CSS |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if y > 41
print('result') | if y > 41:
print('result') | Colon missing after if. | Python |
let temp = 66; let temp = 75; | let temp = 66; temp = 75; | Duplicate declaration. | JavaScript |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if x = 23 | if x == 23 | Use ==. | MATLAB |
INSERT INTO products VALUES ('world',8) | INSERT INTO products (name, email) VALUES ('world',8); | Specify columns. | SQL |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
<br></br> | <br> | Self-closing. | HTML |
else
print('message') | else:
print('message') | Colon after else. | Python |
const count = 36; count = 76; | let count = 36; count = 76; | Cannot reassign const. | JavaScript |
{{"title":"result",}} | {{"title":"result"}} | Remove trailing comma. | JSON |
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