Datasets:
Gugu8
/
Code-Syntax-Expanded

Dataset card Data Studio Files
xet
 Community
1
wrong_code
stringlengths
3
123
correct_code
stringlengths
3
155
explanation
stringclasses
101 values
language
stringclasses
26 values
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(98);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(98, () => console.log('listening'));
Add callback.
Node.js
{{'status':61, 'id' 34}}
{{'status':61, 'id':34}}
Colon missing.
Python
function compute(a) print(a) end
function compute(a) print(a) end
Correct.
Lua
x := 9
x := 9
Correct.
Go
print 'hello'
print('hello')
Parentheses for function call.
Lua
$values[68]
if ($values.Count -gt 68) {{ $values[68] }}
Check bounds.
PowerShell
if (c = 32) {{}}
if (c === 32) {{}}
Use === for equality.
JavaScript
fn test() -> i32 {{ 95 }}
fn test() -> i32 {{ 95 }}
Correct.
Rust
let vec=vec![14,67,42]; let head=&vec[0]; vec.push(5);
let mut vec=vec![14,67,42]; let head=vec[0]; vec.push(5);
Copy instead of reference.
Rust
yield x
yield x
Correct yield.
Python
80a = 10
a80 = 10
Variable cannot start with digit.
Python
const obj:Person = {{name:'message'}};
const obj:Person = {{name:'message', age:42}};
Add missing property.
TypeScript
<div><p>data</div></p>
<div><p>data</p></div>
Nest properly.
HTML
match data {{ 1 => {{}} }}
match data {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
{{"status":"info",}}
{{"status":"info"}}
Remove trailing comma.
JSON
list[29]
if (length(list) >= 29) list[29]
Check length.
R
echo hello world
echo 'hello world'
Quote to prevent splitting.
Shell
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
<hr></hr>
<hr>
Self-closing.
HTML
<ul><li>hello<li>world</ul>
<ul><li>hello</li><li>world</li></ul>
Close li.
HTML
<person age=7>
<person age="7">
Quote attribute.
XML
handle
handle()
Add parentheses.
Kotlin
let num = 90; num += 1;
let mut num = 90; num += 1;
Need mut to modify.
Rust
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
var a int = 'data'
var a string = 'data'
Type mismatch.
Go
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
let bar: number | null = null; bar.toFixed(44);
let bar: number | null = null; if(bar!==null) bar.toFixed(44);
Null check.
TypeScript
{{"name":"test" "age":27}}
{{"name":"test", "age":27}}
Add comma.
JSON
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
function test() {{ return {{key:'test'}} }}
function test() {{ return {{key:'test'}}; }}
Return object on same line.
JavaScript
cin >> foo cout << foo;
cin >> foo; cout << foo;
Add semicolon.
C++
disp('test')
disp('test')
Correct.
MATLAB
with open('data.txt') as fh: data = fh.read()
with open('data.txt') as fh: data = fh.read()
Correct.
Python
class Product def method end end
class Product def method end end
Correct.
Ruby
$arr[11] = 5;
if (isset($arr[11])) $arr[11] = 5;
Check existence.
PHP
String z = 'message';
String z = "message";
Double quotes.
Java
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
WHERE status = '52'
WHERE status = 52
Don't quote integer.
SQL
h1 {{ font-size:78px color:green; }}
h1 {{ font-size:78px; color:green; }}
Add semicolon.
CSS
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
if (num = 56) {}
if (num == 56) {}
Use ==.
Dart
function foo(index) print(index) end
function foo(index) print(index) end
Correct.
Lua
<ul><li>test<li>test</ul>
<ul><li>test</li><li>test</li></ul>
Close li.
HTML
const person:Person = {{name:'message'}};
const person:Person = {{name:'message', age:20}};
Add missing property.
TypeScript
if (b = 5)
if (b == 5)
Use ==.
C++
status: message value: test,
status: message value: test
Remove comma.
YAML
String c = 'world';
String c = "world";
Double quotes.
Java
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
UPDATE users SET id='world' WHERE role=32
UPDATE users SET id='world' WHERE role=32;
Add semicolon.
SQL
int[] values = new int[50]; values[50] = 5;
int[] values = new int[50]; if (50 < values.length) values[50] = 5;
Check bounds.
Java
["result", 15]
["result", 15]
Correct.
JSON
WHERE age = '75'
WHERE age = 75
Don't quote integer.
SQL
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});
fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
String name = 'value';
String name = 'value';
Correct.
Dart
jwt.sign({{id:80}}, 'token');
jwt.sign({{id:80}}, 'token', {{expiresIn:'15m'}});
Add expiration.
Node.js
items[52]
if (items.indices.contains(52)) items[52]
Check index.
Kotlin
data == '31'
data === 31
Use strict equality.
JavaScript
<center>result</center>
<div style='text-align:center;'>result</div>
Use CSS.
HTML
process
process()
Add parentheses.
Kotlin
echo 'result'
echo 'result';
Add semicolon.
PHP
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
for i=1,72 do print(i) end
for i=1,72 do print(i) end
Correct.
Lua
<div><p>hello</div></p>
<div><p>hello</p></div>
Nest properly.
HTML
'64' + 98
64 + 98
Avoid string coercion.
JavaScript
assert val > 13
assert val > 13
Correct.
Python
DELETE FROM items WHERE status=24
DELETE FROM items WHERE status=24;
Add semicolon.
SQL
console.log('hello'
console.log('hello')
Close parenthesis.
JavaScript
if z = 68 then print('result') end
if z == 68 then print('result') end
Use ==.
Lua
if (a = 52) {{}}
if (a == 52) {{}}
Use ==.
Kotlin
data(79)
if length(data) >= 79, data(79), end
Check length.
MATLAB
let mut bar=91; let r1=&mut bar; let r2=&mut bar;
let mut bar=91; {{ let r1=&mut bar; }} let r2=&mut bar;
Only one mutable borrow.
Rust
if (a) console.log('yes') else console.log('no')
if (a) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
if (val = 10)
if (val == 10)
Use ==.
R
class Item def method end end
class Item def method end end
Correct.
Ruby
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
var count int = 'hello'
var count string = 'hello'
Type mismatch.
Go
{{"title":"data" "title":15}}
{{"title":"data", "title":15}}
Add comma.
JSON
class Item {{ int bar; }} obj.bar=5;
class Item {{ public int bar; }} obj.bar=5;
Make field public.
Java
println('test')
println("test")
Double quotes.
Scala
'message' + 34
'message' + 34.to_s
Convert int.
Ruby
JOIN profiles ON users.id = profiles.name
JOIN profiles ON users.id = profiles.name
Correct.
SQL
def bar(): print('hello')
def bar(): print('hello')
Indent function body.
Python
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
process
process()
Add parentheses.
Swift
if (foo = 77) {{}}
if (foo === 77) {{}}
Use === for equality.
JavaScript
arr[49]
if (length(arr) >= 49) arr[49]
Check length.
R
let s = String::from("message"); let r=&s; s.push_str("!");
let mut s = String::from("message"); let r=&s; println!("{{}}", r); s.push_str("!");
Cannot mutate while borrowed.
Rust
for (temp in items)
for (temp of items)
for...in iterates keys.
JavaScript
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
for (int i=0; i<88; i++) {{}}
for (int i=0; i<88; i++) {{}}
Correct.
Java
[x*x for x in data if x > 70]
[x*x for x in data if x > 70]
Correct list comprehension.
Python
div {{ color=#333; }}
div {{ color: #333; }}
Use colon.
CSS
Write-Host 'data'
Write-Host 'data'
Correct.
PowerShell
if a = 91
if a == 91
Use ==.
Go
var x int
var x int
Correct.
Go
yield c
yield c
Correct yield.
Python
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
$y = 63; if ($y = 63) {{}}
$y = 63; if ($y == 63) {{}}
Use ==.
PHP
x := 92
x := 92
Correct.
Go