Datasets:
Corpus-NZ
/
Code-Syntax-Expanded

Dataset card Data Studio Files
xet
 Community
wrong_code
stringlengths
3
123
correct_code
stringlengths
3
155
explanation
stringclasses
101 values
language
stringclasses
26 values
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
List(73,14,61)
List(73,14,61)
Correct.
Scala
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
let mut data=83; let ref1=&mut data; let r2=&mut data;
let mut data=83; {{ let ref1=&mut data; }} let r2=&mut data;
Only one mutable borrow.
Rust
<entry><desc>world</desc><name>58</name></entry
<entry><desc>world</desc><name>58</name></entry>
Add closing >.
XML
String y = 'value';
String y = "value";
Double quotes.
Java
cin >> foo;
int foo; cin >> foo;
Declare variable.
C++
if (data = 61)
if (data == 61)
Use ==.
Scala
def handle(): print('hello')
def handle(): print('hello')
Indent function body.
Python
if [ $num = 5 ]; then
if [ "$num" = 5 ]; then
Quote variable.
Shell
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
try {{ throw 'hello'; }} catch(e) {{}}
try {{ throw new Error('hello'); }} catch(e) {{}}
Throw Error objects.
JavaScript
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
JOIN profiles ON items.id = profiles.age
JOIN profiles ON items.id = profiles.age
Correct.
SQL
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
class Order {{ int a; }};
class Order {{ public: int a; }};
Make public.
C++
val foo = 'info'
val foo = "info"
Double quotes.
Kotlin
int[] values = new int[17]; values[17] = 5;
int[] values = new int[17]; if (17 < values.length) values[17] = 5;
Check bounds.
Java
if num = 32
if num == 32
Use ==.
MATLAB
assert num > 53
assert num > 53
Correct.
Python
UPDATE users SET age='test' WHERE status=89
UPDATE users SET age='test' WHERE status=89;
Add semicolon.
SQL
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(60);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(60, () => console.log('listening'));
Add callback.
Node.js
if (a = 45) {{}}
if (a == 45) {{}}
Use ==.
Java
foo
foo()
Add parentheses.
Swift
fmt.Println 'info'
fmt.Println('info')
Missing parentheses.
Go
class User {{ int a; }} obj.a=5;
class User {{ public int a; }} obj.a=5;
Make field public.
Java
print 'hello'
print('hello')
print needs parentheses.
Python
if (bar = 60)
if (bar == 60)
Use ==.
C++
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
'info' + 97
'info' + 97.to_s
Convert int.
Ruby
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
values[92]
if values.indices.contains(92) {{ values[92] }}
Check index.
Swift
var x int
var x int
Correct.
Go
arr(23)
if length(arr) >= 23, arr(23), end
Check length.
MATLAB
var temp int = 'test'
var temp string = 'test'
Type mismatch.
Go
def test puts 'hello' end
def test puts 'hello' end
Correct.
Ruby
function render() {{ return {{key:'info'}} }}
function render() {{ return {{key:'info'}}; }}
Return object on same line.
JavaScript
arr.forEach(function(num) {{ console.log(num); }})
arr.forEach((num) => {{ console.log(num); }})
Arrow functions are cleaner.
JavaScript
int num = 'world';
String num = 'world';
Type mismatch.
Dart
for i=1,32 do print(i) end
for i=1,32 do print(i) end
Correct.
Lua
os.sqrt(4)
import os os.sqrt(4)
Import module first.
Python
value: message age: data,
value: message age: data
Remove comma.
YAML
if x = 88
if x == 88
Use ==.
Go
if ($bar = 68) {{}}
if ($bar -eq 68) {{}}
Use -eq.
PowerShell
SELECT * FROM items WHRE name=74;
SELECT * FROM items WHERE name=74;
Fix WHERE.
SQL
switch(val){{ case 82: break; }}
switch(val){{ case 82: break; default: break; }}
Add default case.
Java
console.log('value'
console.log('value')
Close parenthesis.
JavaScript
yield data
yield data
Correct yield.
Python
for b in range(20) print(b)
for b in range(20): print(b)
Colon after for.
Python
if ($item = 79)
if ($item == 79)
Use ==.
Perl
'37' + 69
37 + 69
Avoid string coercion.
JavaScript
name: data age: 67
name: data age: 67
Correct.
YAML
WHERE name = '17'
WHERE name = 17
Don't quote integer.
SQL
class Item {{ int item; }} obj.item=5;
class Item {{ public int item; }} obj.item=5;
Make field public.
Java
<?php // code ?>
<?php // code ?>
Correct.
PHP
raise 'message'
raise Exception('message')
Raise needs an exception class.
Python
<user name='message'/>
<user name="message"/>
Double quotes.
XML
else print('message')
else: print('message')
Colon after else.
Python
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
let result = 72; result += 1;
let mut result = 72; result += 1;
Need mut to modify.
Rust
if (bar = 38) {{}}
if (bar === 38) {{}}
Use === for equality.
JavaScript
if num = 94
if num == 94
Use ==.
MATLAB
let num: Int = 'result'
let num: String = 'result'
Fix type.
Swift
INSERT INTO items VALUES ('output',73)
INSERT INTO items (age, status) VALUES ('output',73);
Specify columns.
SQL
class = 'hello'
class_name = 'hello'
'class' is a keyword.
Python
assert foo > 44
assert foo > 44
Correct.
Python
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
while data > 98 data -= 1
while data > 98: data -= 1
Colon missing after while.
Python
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
if [ $index = 49 ]; then
if [ "$index" = 49 ]; then
Quote variable.
Shell
print 'world'
print('world')
print needs parentheses.
Python
const y;
const y = 56;
Initialize const.
JavaScript
if (z = 72)
if (z == 72)
Use ==.
C++
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
x := 1
x := 1
Correct.
Go
let list=vec![43,30,90]; let first=&list[0]; list.push(7);
let mut list=vec![43,30,90]; let first=list[0]; list.push(7);
Copy instead of reference.
Rust
if num = 82
if num == 82
Use ==.
Go
{ "name": "output" }
{ "name": "output" }
Correct.
JSON
function test(): void {{ return 75; }}
function test(): number {{ return 75; }}
Return type mismatch.
TypeScript
test
test()
Add parentheses.
Swift
if data = 63:
if data == 63:
Use == for comparison.
Python
count = value
count = 'value'
Quote strings.
Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
cin >> a cout << a;
cin >> a; cout << a;
Add semicolon.
C++
let index: number | null = null; index.toFixed(80);
let index: number | null = null; if(index!==null) index.toFixed(80);
Null check.
TypeScript
$data[41] = 5;
if (isset($data[41])) $data[41] = 5;
Check existence.
PHP
local y = 89
local y = 89
Correct.
Lua
if (z = 78)
if (z == 78)
Use ==.
R
if (foo) console.log('yes') else console.log('no')
if (foo) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
age: data name: test,
age: data name: test
Remove comma.
YAML
[62, 60, 58
[62, 60, 58]
Close bracket.
Python
<br></br>
<br>
Self-closing.
HTML
val num: Int = 'message'
val num: String = 'message'
Fix type.
Kotlin
String count = 'world';
String count = "world";
Double quotes.
Java
$count = 3; if ($count = 3) {{}}
$count = 3; if ($count == 3) {{}}
Use ==.
PHP
class Product {{ int count; }};
class Product {{ public: int count; }};
Make public.
C++