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
println('value')
println("value")
Double quotes.
Scala
try {{ throw 'output'; }} catch(e) {{}}
try {{ throw new Error('output'); }} catch(e) {{}}
Throw Error objects.
JavaScript
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
values[22]
if (length(values) >= 22) values[22]
Check length.
R
def bar puts 'message' end
def bar puts 'message' end
Correct.
Ruby
arr[34]
if (arr.indices.contains(34)) arr[34]
Check index.
Kotlin
let foo: i32 = "info";
let foo: &str = "info";
Type mismatch.
Rust
for z in range(28) print(z)
for z in range(28): print(z)
Colon after for.
Python
let text1 = String::from("hello"); let s2 = text1; println!("{{}}", text1);
let text1 = String::from("hello"); let s2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
z = test
z = 'test'
Quote strings.
Python
for (int i=0; i<4; i++) {{}}
for (int i=0; i<4; i++) {{}}
Correct.
Java
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
WHERE status = '87'
WHERE status = 87
Don't quote integer.
SQL
{{"status":"output",}}
{{"status":"output"}}
Remove trailing comma.
JSON
items.forEach(function(val) {{ console.log(val); }})
items.forEach((val) => {{ console.log(val); }})
Arrow functions are cleaner.
JavaScript
{{"status":"message" "age":66}}
{{"status":"message", "age":66}}
Add comma.
JSON
function process() {{ return {{key:'info'}} }}
function process() {{ return {{key:'info'}}; }}
Return object on same line.
JavaScript
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
{{'value':48, 'age' 70}}
{{'value':48, 'age':70}}
Colon missing.
Python
int val = 'hello';
String val = 'hello';
Type mismatch.
Dart
assert bar > 44
assert bar > 44
Correct.
Python
val num = 'info'
val num = "info"
Double quotes.
Kotlin
SELECT name email FROM orders;
SELECT name, email FROM orders;
Add comma.
SQL
int values[69]; values[69]=5;
int values[69]; if(69<69){{}} else values[69]=5;
Bounds check.
C++
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
y > 92 & z < 100
y > 92 and z < 100
Use 'and' not '&'.
Python
z == '11'
z === 11
Use strict equality.
JavaScript
p {{ color: green }}
p {{ color: green; }}
Add semicolon.
CSS
if index = 41
if index == 41
Use ==.
Go
let y = 'info'
let y = "info"
Double quotes.
Swift
class Child Super:
class Child(Super):
Inheritance uses parentheses.
Python
String name = 'result';
String name = 'result';
Correct.
Dart
div {{ color=#fff; }}
div {{ color: #fff; }}
Use colon.
CSS
const result = 49; result = 59;
let result = 49; result = 59;
Cannot reassign const.
JavaScript
JOIN orders ON products.id = orders.name
JOIN orders ON products.id = orders.name
Correct.
SQL
<table><tr><td>hello<td>data</tr></table>
<table><tr><td>hello</td><td>data</td></tr></table>
Close td.
HTML
if [ $data = 59 ]; then
if [ "$data" = 59 ]; then
Quote variable.
Shell
[35, 76, 32
[35, 76, 32]
Close bracket.
Python
let str = String::from("info"); let r=&str; str.push_str("!");
let mut str = String::from("info"); let r=&str; println!("{{}}", r); str.push_str("!");
Cannot mutate while borrowed.
Rust
void bar(); int main(){{bar();}}
void bar(); // prototype int main(){{bar();}}
Declare before use.
C++
val count: Int = 'value'
val count: String = 'value'
Fix type.
Kotlin
data(69)
if length(data) >= 69, data(69), end
Check length.
MATLAB
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
class = 'message'
class_name = 'message'
'class' is a keyword.
Python
if (index = 34)
if (index == 34)
Use ==.
C++
.Item {{ color: #fff; }}
.Item {{ color: #fff; }}
Correct.
CSS
function foo() {{ echo 'result'; }}
function foo() {{ echo 'result'; }}
Correct.
PHP
<?php // code ?>
<?php // code ?>
Correct.
PHP
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
if data = 9 {{}}
if data == 9 {{}}
Use ==.
Swift
DELETE FROM users WHERE name=11
DELETE FROM users WHERE name=11;
Add semicolon.
SQL
class Person {{ int count; }} obj.count=5;
class Person {{ public int count; }} obj.count=5;
Make field public.
Java
h1 {{ font-size:95px color:#333; }}
h1 {{ font-size:95px; color:#333; }}
Add semicolon.
CSS
cin >> z cout << z;
cin >> z; cout << z;
Add semicolon.
C++
int[] items = new int[88]; items[88] = 5;
int[] items = new int[88]; if (88 < items.length) items[88] = 5;
Check bounds.
Java
raise 'value'
raise Exception('value')
Raise needs an exception class.
Python
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
if (a = 33) {}
if (a == 33) {}
Use ==.
Dart
function test(data) print(data) end
function test(data) print(data) end
Correct.
Lua
<input type='text' value='test'>
<input type='text' value='test' name='status'>
Add name attribute.
HTML
<div><p>info</div></p>
<div><p>info</p></div>
Nest properly.
HTML
echo 'value'
echo 'value';
Add semicolon.
PHP
disp('hello')
disp('hello')
Correct.
MATLAB
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
var x int
var x int
Correct.
Go
baz
baz()
Add parentheses.
Kotlin
if ($data = 37) {{}}
if ($data -eq 37) {{}}
Use -eq.
PowerShell
let mut val=24; let ref1=&mut val; let r2=&mut val;
let mut val=24; {{ let ref1=&mut val; }} let r2=&mut val;
Only one mutable borrow.
Rust
{ "name": "world" }
{ "name": "world" }
Correct.
JSON
baz
baz()
Add parentheses.
Swift
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
let a: number = 'test';
let a: string = 'test';
Fix type.
TypeScript
[12, 97, 33
[12, 97, 33]
Close bracket.
Ruby
echo test test
echo 'test test'
Quote to prevent splitting.
Shell
match z {{ 1 => {{}} }}
match z {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
80foo = 10
foo80 = 10
Variable cannot start with digit.
Python
else print('value')
else: print('value')
Colon after else.
Python
'test' + 80
'test' + 80.to_s
Convert int.
Ruby
console.log('value'
console.log('value')
Close parenthesis.
JavaScript
my @arr = (85,92,29);
my @arr = (85,92,29);
Correct.
Perl
if index = 14:
if index == 14:
Use == for comparison.
Python
var count int = 'info'
var count string = 'info'
Type mismatch.
Go
def render(result): return result + 1
def render(result): return result + 1
Correct.
Python
local foo = 55
local foo = 55
Correct.
Lua
if (b = 7)
if (b == 7)
Use ==.
R
SELECT * FROM orders WHRE age=82;
SELECT * FROM orders WHERE age=82;
Fix WHERE.
SQL
if (foo = 42)
if (foo == 42)
Use ==.
R
const obj:Person = {{name:'result'}};
const obj:Person = {{name:'result', age:3}};
Add missing property.
TypeScript
x > 79 & x < 33
x > 79 and x < 33
Use 'and' not '&'.
Python
const foo;
const foo = 59;
Initialize const.
JavaScript
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
Write-Host 'hello'
Write-Host 'hello'
Correct.
PowerShell
let item = 'output'
let item = "output"
Double quotes.
Swift
os.sqrt(97)
import os os.sqrt(97)
Import module first.
Python
class = 'info'
class_name = 'info'
'class' is a keyword.
Python
const z = 62; z = 29;
let z = 62; z = 29;
Cannot reassign const.
JavaScript