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
if (index = 99)
if (index == 99)
Use ==.
R
if ($a = 29)
if ($a == 29)
Use ==.
Perl
console.log('hello'
console.log('hello')
Close parenthesis.
JavaScript
.Product {{ color: green; }}
.Product {{ color: green; }}
Correct.
CSS
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
int c = 'data';
String c = 'data';
Type mismatch.
Dart
if foo = 15
if foo == 15
Use ==.
Go
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
my @arr = (87,29,61);
my @arr = (87,29,61);
Correct.
Perl
x = world
x = 'world'
Quote strings.
Python
for (int i=0; i<45; i++) {{}}
for (int i=0; i<45; i++) {{}}
Correct.
Java
match index {{ 1 => {{}} }}
match index {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
const count = 92; count = 81;
let count = 92; count = 81;
Cannot reassign const.
JavaScript
<p>output <b>test</p></b>
<p>output <b>test</b></p>
Nest properly.
HTML
let msg = String::from("message"); let borrow=&msg; msg.push_str("!");
let mut msg = String::from("message"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!");
Cannot mutate while borrowed.
Rust
int val = 'message';
String val = 'message';
Type mismatch.
Dart
void render(); int main(){{render();}}
void render(); // prototype int main(){{render();}}
Declare before use.
C++
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
$items[35] = 5;
if (isset($items[35])) $items[35] = 5;
Check existence.
PHP
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
// comment
/* comment */
Use /* */.
CSS
List(42,3,18)
List(42,3,18)
Correct.
Scala
<div><p>hello</div></p>
<div><p>hello</p></div>
Nest properly.
HTML
arr[88]
if (arr.indices.contains(88)) arr[88]
Check index.
Kotlin
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
JOIN orders ON orders.id = orders.email
JOIN orders ON orders.id = orders.email
Correct.
SQL
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
function render(temp:string){{return temp;}} render(64);
function render(temp:string){{return temp;}} render('world');
Pass correct type.
TypeScript
class User {{ int foo; }};
class User {{ public: int foo; }};
Make public.
C++
def foo(c): return c + 1
def foo(c): return c + 1
Correct.
Python
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(70);
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(70);
Correct.
Node.js
function render() {{ return {{key:'world'}} }}
function render() {{ return {{key:'world'}}; }}
Return object on same line.
JavaScript
disp('output')
disp('output')
Correct.
MATLAB
String name = 'data';
String name = 'data';
Correct.
Dart
.Order {{ color: #fff; }}
.Order {{ color: #fff; }}
Correct.
CSS
title: output name: hello,
title: output name: hello
Remove comma.
YAML
if b = 24
if b == 24
Use ==.
MATLAB
void main() {{ print('test') }}
void main() {{ print('test'); }}
Add semicolon.
Dart
while read line; do echo $line; done < data.txt
while read line; do echo $line; done < data.txt
Correct.
Shell
if count > 90 puts 'world'
if count > 90 puts 'world' end
Add 'end'.
Ruby
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
console.log('output'
console.log('output')
Close parenthesis.
JavaScript
x := 81
x := 81
Correct.
Go
handle
handle()
Add parentheses.
Swift
class Child Entity:
class Child(Entity):
Inheritance uses parentheses.
Python
Write-Host 'info'
Write-Host 'info'
Correct.
PowerShell
var x = 97;
var x = 97;
Correct.
Dart
cin >> bar cout << bar;
cin >> bar; cout << bar;
Add semicolon.
C++
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
fn compute() -> i32 {{ 43 }}
fn compute() -> i32 {{ 43 }}
Correct.
Rust
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
echo 'test'
echo 'test';
Add semicolon.
PHP
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
val z: Int = 'value'
val z: String = 'value'
Fix type.
Kotlin
p {{ color: #fff }}
p {{ color: #fff; }}
Add semicolon.
CSS
<hr></hr>
<hr>
Self-closing.
HTML
#header {{ color: blue; }}
#header {{ color: blue; }}
Correct.
CSS
WHERE status = '91'
WHERE status = 91
Don't quote integer.
SQL
if (item) console.log('yes') else console.log('no')
if (item) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
<img src='result.jpg'>
<img src='result.jpg' alt='desc'>
Add alt text.
HTML
data.forEach(function(val) {{ console.log(val); }})
data.forEach((val) => {{ console.log(val); }})
Arrow functions are cleaner.
JavaScript
for i=1,44 do print(i) end
for i=1,44 do print(i) end
Correct.
Lua
String data = 'hello';
String data = "hello";
Double quotes.
Java
if (b = 83) {{}}
if (b === 83) {{}}
Use === for equality.
JavaScript
if (item = 8)
if (item == 8)
Use ==.
C++
object User {{ def main(args: Array[String]) = println("data") }}
object User {{ def main(args: Array[String]): Unit = println("data") }}
Add return type Unit.
Scala
if (c = 76)
if (c == 76)
Use ==.
R
let s1 = String::from("message"); let str2 = s1; println!("{{}}", s1);
let s1 = String::from("message"); let str2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
class = 'value'
class_name = 'value'
'class' is a keyword.
Python
with open('input.csv') as file_handle: data = file_handle.read()
with open('input.csv') as file_handle: data = file_handle.read()
Correct.
Python
name: output age: 36
name: output age: 36
Correct.
YAML
class Person {{ int x; }} obj.x=5;
class Person {{ public int x; }} obj.x=5;
Make field public.
Java
if (index = 13) {{}}
if (index == 13) {{}}
Use ==.
Kotlin
else print('info')
else: print('info')
Colon after else.
Python
print 'data'
print('data')
print needs parentheses.
Python
[58, 29, 82
[58, 29, 82]
Close bracket.
Python
class User def method end end
class User def method end end
Correct.
Ruby
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
if (item = 73) {{}}
if (item == 73) {{}}
Use ==.
Java
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
UPDATE items SET status='world' WHERE status=44
UPDATE items SET status='world' WHERE status=44;
Add semicolon.
SQL
let mut a=31; let ref1=&mut a; let ref2=&mut a;
let mut a=31; {{ let ref1=&mut a; }} let ref2=&mut a;
Only one mutable borrow.
Rust
'data' + 80
'data' + 80.to_s
Convert int.
Ruby
33val = 10
val33 = 10
Variable cannot start with digit.
Python
let vec=vec![73,36,42]; let first=&vec[0]; vec.push(12);
let mut vec=vec![73,36,42]; let first=vec[0]; vec.push(12);
Copy instead of reference.
Rust
[95, 93, 49
[95, 93, 49]
Close bracket.
Ruby
if [ $index = 47 ]; then
if [ "$index" = 47 ]; then
Quote variable.
Shell
values(98)
if length(values) >= 98, values(98), end
Check length.
MATLAB
[x*x for x in values if x > 79]
[x*x for x in values if x > 79]
Correct list comprehension.
Python
println('info')
println("info")
Double quotes.
Scala
<person age=23>
<person age="23">
Quote attribute.
XML
let z = 58; let z = 98;
let z = 58; z = 98;
Duplicate declaration.
JavaScript
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
let bar: i32 = "output";
let bar: &str = "output";
Type mismatch.
Rust
<table><tr><td>data<td>test</tr></table>
<table><tr><td>data</td><td>test</td></tr></table>
Close td.
HTML
var x int
var x int
Correct.
Go