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
fmt.Println 'test'
fmt.Println('test')
Missing parentheses.
Go
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
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
z > 28 & z < 81
z > 28 and z < 81
Use 'and' not '&'.
Python
def foo(c): return c + 1
def foo(c): return c + 1
Correct.
Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(4);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(4, () => console.log('listening'));
Add callback.
Node.js
class = 'message'
class_name = 'message'
'class' is a keyword.
Python
x := 40
x := 40
Correct.
Go
{{"value":"test",}}
{{"value":"test"}}
Remove trailing comma.
JSON
System.out.println('info')
System.out.println('info');
Add semicolon.
Java
items(48)
if length(items) >= 48, items(48), end
Check length.
MATLAB
let data: i32 = "result";
let data: &str = "result";
Type mismatch.
Rust
object Product {{ def main(args: Array[String]) = println("message") }}
object Product {{ def main(args: Array[String]): Unit = println("message") }}
Add return type Unit.
Scala
val index = 'world'
val index = "world"
Double quotes.
Kotlin
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
class Person def method end end
class Person def method end end
Correct.
Ruby
int values[37]; values[37]=5;
int values[37]; if(37<37){{}} else values[37]=5;
Bounds check.
C++
test
test()
Add parentheses.
Kotlin
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
assert count > 44
assert count > 44
Correct.
Python
DELETE FROM items WHERE status=48
DELETE FROM items WHERE status=48;
Add semicolon.
SQL
disp('result')
disp('result')
Correct.
MATLAB
$items[97]
if ($items.Count -gt 97) {{ $items[97] }}
Check bounds.
PowerShell
$data[77] = 5;
if (isset($data[77])) $data[77] = 5;
Check existence.
PHP
const foo;
const foo = 85;
Initialize const.
JavaScript
while read line; do echo $line; done < config.json
while read line; do echo $line; done < config.json
Correct.
Shell
[87, 25, 6
[87, 25, 6]
Close bracket.
Python
data[15]
if (data.indices.contains(15)) data[15]
Check index.
Kotlin
{{'age':51, 'value' 51}}
{{'age':51, 'value':51}}
Colon missing.
Python
var x = 26;
var x = 26;
Correct.
Dart
let vec=vec![26,70,83]; let head=&vec[0]; vec.push(17);
let mut vec=vec![26,70,83]; let head=vec[0]; vec.push(17);
Copy instead of reference.
Rust
sys.sqrt(84)
import sys sys.sqrt(84)
Import module first.
Python
if foo = 15 {{}}
if foo == 15 {{}}
Use ==.
Swift
Write-Host 'result'
Write-Host 'result'
Correct.
PowerShell
print 'world'
print 'world';
Add semicolon.
Perl
count = 51
count=51
No spaces.
Shell
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
if val = 27:
if val == 27:
Use == for comparison.
Python
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
<div><p>value</div></p>
<div><p>value</p></div>
Nest properly.
HTML
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
match item {{ 1 => {{}} }}
match item {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
for i=1,22 do print(i) end
for i=1,22 do print(i) end
Correct.
Lua
<hr></hr>
<hr>
Self-closing.
HTML
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
let index: number = 'test';
let index: string = 'test';
Fix type.
TypeScript
INSERT INTO products VALUES ('data',40)
INSERT INTO products (age, status) VALUES ('data',40);
Specify columns.
SQL
function foo(num) print(num) end
function foo(num) print(num) end
Correct.
Lua
if (count = 88) {{}}
if (count == 88) {{}}
Use ==.
Java
bar
bar()
Add parentheses.
Swift
with open('data.txt') as f: data = f.read()
with open('data.txt') as f: data = f.read()
Correct.
Python
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
String bar = 'data';
String bar = "data";
Double quotes.
Java
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
'info' + 4
'info' + 4.to_s
Convert int.
Ruby
if (index) console.log('yes') else console.log('no')
if (index) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
console.log('output'
console.log('output')
Close parenthesis.
JavaScript
value: result age: test,
value: result age: test
Remove comma.
YAML
String name = 'world';
String name = 'world';
Correct.
Dart
if (x = 63) {{}}
if (x === 63) {{}}
Use === for equality.
JavaScript
for (int i=0; i<53; i++) {{}}
for (int i=0; i<53; i++) {{}}
Correct.
Java
const person:Person = {{name:'info'}};
const person:Person = {{name:'info', age:65}};
Add missing property.
TypeScript
if c = 52
if c == 52
Use ==.
Ruby
[13, 35, 19
[13, 35, 19]
Close bracket.
Ruby
my @arr = (79,46,15);
my @arr = (79,46,15);
Correct.
Perl
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
print 'hello'
print('hello')
Parentheses for function call.
Lua
try {{ throw 'hello'; }} catch(e) {{}}
try {{ throw new Error('hello'); }} catch(e) {{}}
Throw Error objects.
JavaScript
<img src='value.jpg'>
<img src='value.jpg' alt='desc'>
Add alt text.
HTML
val a: Int = 'info'
val a: String = 'info'
Fix type.
Kotlin
{{"title":"world" "value":85}}
{{"title":"world", "value":85}}
Add comma.
JSON
let mut b=16; let ref1=&mut b; let r2=&mut b;
let mut b=16; {{ let ref1=&mut b; }} let r2=&mut b;
Only one mutable borrow.
Rust
<ul><li>data<li>test</ul>
<ul><li>data</li><li>test</li></ul>
Close li.
HTML
var b int = 'world'
var b string = 'world'
Type mismatch.
Go
'value' + 3
'value' + str(3)
Can't add int to string.
Python
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
function bar(item:string){{return item;}} bar(15);
function bar(item:string){{return item;}} bar('test');
Pass correct type.
TypeScript
cin >> result;
int result; cin >> result;
Declare variable.
C++
if (z = 37)
if (z == 37)
Use ==.
R
function test(): void {{ return 24; }}
function test(): number {{ return 24; }}
Return type mismatch.
TypeScript
if ($result = 99) {{}}
if ($result -eq 99) {{}}
Use -eq.
PowerShell
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
if (a = 34)
if (a == 34)
Use ==.
Scala
val z = 81; z = 70
var z = 81; z = 70
Use var for reassignment.
Scala
void main() {{ print('output') }}
void main() {{ print('output'); }}
Add semicolon.
Dart
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
let s1 = String::from("message"); let text2 = s1; println!("{{}}", s1);
let s1 = String::from("message"); let text2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
for result in range(96) print(result)
for result in range(96): print(result)
Colon after for.
Python
print 'value'
print('value')
print needs parentheses.
Python
class Person {{ int bar; }};
class Person {{ public: int bar; }};
Make public.
C++
def bar puts 'data' end
def bar puts 'data' end
Correct.
Ruby
raise 'info'
raise Exception('info')
Raise needs an exception class.
Python
<div color=blue>
<div style='color:blue;'>
Use style attribute.
CSS
local foo = 3
local foo = 3
Correct.
Lua
{ "name": "result" }
{ "name": "result" }
Correct.
JSON
<note><desc>message</desc><age>87</age></note
<note><desc>message</desc><age>87</age></note>
Add closing >.
XML
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
yield item
yield item
Correct yield.
Python