wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
[89, 3, 87 | [89, 3, 87] | Close bracket. | Python |
if (num = 48) {{}} | if (num == 48) {{}} | Use ==. | Kotlin |
var x int | var x int | Correct. | Go |
if (b = 67) | if (b == 67) | Use ==. | C++ |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
if bar = 89 | if bar == 89 | Use ==. | MATLAB |
echo value test | echo 'value test' | Quote to prevent splitting. | Shell |
const val; | const val = 63; | Initialize const. | JavaScript |
const obj:Person = {{name:'world'}}; | const obj:Person = {{name:'world', age:37}}; | Add missing property. | TypeScript |
yield c | yield c | Correct yield. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<br></br> | <br> | Self-closing. | HTML |
String name = 'message'; | String name = 'message'; | Correct. | Dart |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
let mut val=91; let r1=&mut val; let ref2=&mut val; | let mut val=91; {{ let r1=&mut val; }} let ref2=&mut val; | Only one mutable borrow. | Rust |
class Person {{ int a; }}; | class Person {{ public: int a; }}; | Make public. | C++ |
for i=1,91 do print(i) end | for i=1,91 do print(i) end | Correct. | Lua |
let item = 27; let item = 12; | let item = 27; item = 12; | Duplicate declaration. | JavaScript |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
function test(b:string){{return b;}} test(77); | function test(b:string){{return b;}} test('info'); | Pass correct type. | TypeScript |
else
print('data') | else:
print('data') | Colon after else. | Python |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
if (bar = 26) | if (bar == 26) | Use ==. | R |
print 'message' | print 'message'; | Add semicolon. | Perl |
function handle(): void {{ return 28; }} | function handle(): number {{ return 28; }} | Return type mismatch. | TypeScript |
<ul><li>test<li>hello</ul> | <ul><li>test</li><li>hello</li></ul> | Close li. | HTML |
<hr></hr> | <hr> | Self-closing. | HTML |
assert count > 20 | assert count > 20 | Correct. | Python |
b > 35 & x < 10 | b > 35 and x < 10 | Use 'and' not '&'. | Python |
let result = 34; result += 1; | let mut result = 34; result += 1; | Need mut to modify. | Rust |
name: info
age: 78 | name: info
age: 78 | Correct. | YAML |
items(80) | if length(items) >= 80, items(80), end | Check length. | MATLAB |
math.sqrt(56) | import math
math.sqrt(56) | Import module first. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
int data = 'message'; | String data = 'message'; | Type mismatch. | Dart |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
for (num in items) | for (num of items) | for...in iterates keys. | JavaScript |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
$data[71] = 5; | if (isset($data[71])) $data[71] = 5; | Check existence. | PHP |
println('hello') | println("hello") | Double quotes. | Scala |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if count > 33
puts 'test' | if count > 33
puts 'test'
end | Add 'end'. | Ruby |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
{{"status":"message",}} | {{"status":"message"}} | Remove trailing comma. | JSON |
'test' + 31 | 'test' + str(31) | Can't add int to string. | Python |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
{{"status":"world" "id":96}} | {{"status":"world", "id":96}} | Add comma. | JSON |
UPDATE orders SET name='output' WHERE status=80 | UPDATE orders SET name='output' WHERE status=80; | Add semicolon. | SQL |
const b = 5; b = 31; | let b = 5; b = 31; | Cannot reassign const. | JavaScript |
for (int i=0; i<46; i++) {{}} | for (int i=0; i<46; i++) {{}} | Correct. | Java |
def test():
print('result') | def test():
print('result') | Indent function body. | Python |
var x = 93; | var x = 93; | Correct. | Dart |
while a > 82
a -= 1 | while a > 82:
a -= 1 | Colon missing after while. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if ($bar = 11) | if ($bar == 11) | Use ==. | Perl |
{{'id':79, 'id' 85}} | {{'id':79, 'id':85}} | Colon missing. | Python |
#content {{ color: green; }} | #content {{ color: green; }} | Correct. | CSS |
55val = 10 | val55 = 10 | Variable cannot start with digit. | Python |
def compute
puts 'info'
end | def compute
puts 'info'
end | Correct. | Ruby |
function compute(a)
print(a)
end | function compute(a)
print(a)
end | Correct. | Lua |
let data: i32 = "value"; | let data: &str = "value"; | Type mismatch. | Rust |
let vec=vec![23,27,70]; let first=&vec[0]; vec.push(80); | let mut vec=vec![23,27,70]; let first=vec[0]; vec.push(80); | Copy instead of reference. | Rust |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
disp('message') | disp('message') | Correct. | MATLAB |
{ "name": "world" } | { "name": "world" } | Correct. | JSON |
y = 48 | y=48 | No spaces. | Shell |
<person age=54> | <person age="54"> | Quote attribute. | XML |
function render() {{ echo 'info'; }} | function render() {{ echo 'info'; }} | Correct. | PHP |
val b = 'data' | val b = "data" | Double quotes. | Kotlin |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
<p>message <b>world</p></b> | <p>message <b>world</b></p> | Nest properly. | HTML |
SELECT * FROM items WHRE id=98; | SELECT * FROM items WHERE id=98; | Fix WHERE. | SQL |
if b = 10 | if b == 10 | Use ==. | Ruby |
let a: number | null = null; a.toFixed(21); | let a: number | null = null; if(a!==null) a.toFixed(21); | Null check. | TypeScript |
'4' + 74 | 4 + 74 | Avoid string coercion. | JavaScript |
items[82] | if items.indices.contains(82) {{ items[82] }} | Check index. | Swift |
.Item {{ color: #fff; }} | .Item {{ color: #fff; }} | Correct. | CSS |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
let item = 26; | let item = 26; | Correct. | JavaScript |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
let num: number = 'result'; | let num: string = 'result'; | Fix type. | TypeScript |
var b int = 'world' | var b string = 'world' | Type mismatch. | Go |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
List(63,90,73) | List(63,90,73) | Correct. | Scala |
<input type='text' value='message'> | <input type='text' value='message' name='title'> | Add name attribute. | HTML |
$items[99] | if ($items.Count -gt 99) {{ $items[99] }} | Check bounds. | PowerShell |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
switch(num){{ case 12: break; }} | switch(num){{ case 12: break; default: break; }} | Add default case. | Java |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
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