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
let z: number = 'value';
let z: string = 'value';
Fix type.
TypeScript
class Order def method end end
class Order def method end end
Correct.
Ruby
local item = 83
local item = 83
Correct.
Lua
int[] items = new int[76]; items[76] = 5;
int[] items = new int[76]; if (76 < items.length) items[76] = 5;
Check bounds.
Java
cin >> num cout << num;
cin >> num; cout << num;
Add semicolon.
C++
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
assert x > 44
assert x > 44
Correct.
Python
with open('log.txt') as f: data = f.read()
with open('log.txt') as f: data = f.read()
Correct.
Python
echo result hello
echo 'result hello'
Quote to prevent splitting.
Shell
<input type='text' value='data'>
<input type='text' value='data' name='status'>
Add name attribute.
HTML
let temp: Int = 'test'
let temp: String = 'test'
Fix type.
Swift
re.sqrt(22)
import re re.sqrt(22)
Import module first.
Python
if (z = 34) {}
if (z == 34) {}
Use ==.
Dart
for (int i=0; i<71; i++) {{}}
for (int i=0; i<71; i++) {{}}
Correct.
Java
if (data) console.log('yes') else console.log('no')
if (data) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
'output' + 18
'output' + str(18)
Can't add int to string.
Python
my @arr = (27,35,46);
my @arr = (27,35,46);
Correct.
Perl
if (y = 65)
if (y == 65)
Use ==.
C++
'9' + 41
9 + 41
Avoid string coercion.
JavaScript
let s1 = String::from("world"); let str2 = s1; println!("{{}}", s1);
let s1 = String::from("world"); let str2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
100count = 10
count100 = 10
Variable cannot start with digit.
Python
$data[79]
if ($data.Count -gt 79) {{ $data[79] }}
Check bounds.
PowerShell
x := 100
x := 100
Correct.
Go
[x*x for x in data if x > 13]
[x*x for x in data if x > 13]
Correct list comprehension.
Python
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
<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:'output'}} }}
function test() {{ return {{key:'output'}}; }}
Return object on same line.
JavaScript
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
data[21]
if data.indices.contains(21) {{ data[21] }}
Check index.
Swift
val count = 'info'
val count = "info"
Double quotes.
Kotlin
let list=vec![31,87,8]; let head=&list[0]; list.push(36);
let mut list=vec![31,87,8]; let head=list[0]; list.push(36);
Copy instead of reference.
Rust
values.forEach(function(num) {{ console.log(num); }})
values.forEach((num) => {{ console.log(num); }})
Arrow functions are cleaner.
JavaScript
let a = 85; let a = 69;
let a = 85; a = 69;
Duplicate declaration.
JavaScript
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(80);
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(80);
Correct.
Node.js
while count > 72 count -= 1
while count > 72: count -= 1
Colon missing after while.
Python
SELECT * FROM items WHRE status=58;
SELECT * FROM items WHERE status=58;
Fix WHERE.
SQL
if (item = 16) {{}}
if (item == 16) {{}}
Use ==.
Java
{{'value':46, 'age' 64}}
{{'value':46, 'age':64}}
Colon missing.
Python
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
void foo(); int main(){{foo();}}
void foo(); // prototype int main(){{foo();}}
Declare before use.
C++
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
if data = 48 then print('info') end
if data == 48 then print('info') end
Use ==.
Lua
if [ $x = 2 ]; then
if [ "$x" = 2 ]; then
Quote variable.
Shell
list[24]
if (length(list) >= 24) list[24]
Check length.
R
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
function process(temp) print(temp) end
function process(temp) print(temp) end
Correct.
Lua
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
for i=1,24 do print(i) end
for i=1,24 do print(i) end
Correct.
Lua
z = output
z = 'output'
Quote strings.
Python
count == '34'
count === 34
Use strict equality.
JavaScript
let s = String::from("data"); let r=&s; s.push_str("!");
let mut s = String::from("data"); let r=&s; println!("{{}}", r); s.push_str("!");
Cannot mutate while borrowed.
Rust
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
if (index = 29)
if (index == 29)
Use ==.
R
if foo = 38:
if foo == 38:
Use == for comparison.
Python
else print('test')
else: print('test')
Colon after else.
Python
const user:Person = {{name:'info'}};
const user:Person = {{name:'info', age:65}};
Add missing property.
TypeScript
{{"status":"message",}}
{{"status":"message"}}
Remove trailing comma.
JSON
<ul><li>data<li>data</ul>
<ul><li>data</li><li>data</li></ul>
Close li.
HTML
console.log('world'
console.log('world')
Close parenthesis.
JavaScript
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
$count = 90; if ($count = 90) {{}}
$count = 90; if ($count == 90) {{}}
Use ==.
PHP
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
if ($index = 35)
if ($index == 35)
Use ==.
Perl
const a = 52; a = 32;
let a = 52; a = 32;
Cannot reassign const.
JavaScript
data(12)
if length(data) >= 12, data(12), end
Check length.
MATLAB
let val = 48; val += 1;
let mut val = 48; val += 1;
Need mut to modify.
Rust
int result = 'result';
String result = 'result';
Type mismatch.
Dart
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
const bar;
const bar = 38;
Initialize const.
JavaScript
let c: i32 = "info";
let c: &str = "info";
Type mismatch.
Rust
DELETE FROM orders WHERE status=80
DELETE FROM orders WHERE status=80;
Add semicolon.
SQL
<person age=74>
<person age="74">
Quote attribute.
XML
h1 {{ font-size:73px color:#333; }}
h1 {{ font-size:73px; color:#333; }}
Add semicolon.
CSS
print('value')
print('value')
Correct.
R
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
echo 'test'
echo 'test';
Add semicolon.
PHP
if ($item = 72) {{}}
if ($item -eq 72) {{}}
Use -eq.
PowerShell
println('hello')
println("hello")
Double quotes.
Scala
while read line; do echo $line; done < input.csv
while read line; do echo $line; done < input.csv
Correct.
Shell
<person><desc>result</desc><name>28</name></person
<person><desc>result</desc><name>28</name></person>
Add closing >.
XML
<center>world</center>
<div style='text-align:center;'>world</div>
Use CSS.
HTML
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
fmt.Println 'info'
fmt.Println('info')
Missing parentheses.
Go
val z = 81; z = 83
var z = 81; z = 83
Use var for reassignment.
Scala
<table><tr><td>hello<td>data</tr></table>
<table><tr><td>hello</td><td>data</td></tr></table>
Close td.
HTML
let a = 'test'
let a = "test"
Double quotes.
Swift
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
if bar > 7 puts 'result'
if bar > 7 puts 'result' end
Add 'end'.
Ruby
var bar int = 'value'
var bar string = 'value'
Type mismatch.
Go
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
c = 71
c=71
No spaces.
Shell
// comment
/* comment */
Use /* */.
CSS
name: world age: 25
name: world age: 25
Correct.
YAML
if val = 55
if val == 55
Use ==.
Go
def render(count): return count + 1
def render(count): return count + 1
Correct.
Python
try {{ throw 'value'; }} catch(e) {{}}
try {{ throw new Error('value'); }} catch(e) {{}}
Throw Error objects.
JavaScript
<hr></hr>
<hr>
Self-closing.
HTML
<?php // code ?>
<?php // code ?>
Correct.
PHP