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
<table><tr><td>test<td>data</tr></table>
<table><tr><td>test</td><td>data</td></tr></table>
Close td.
HTML
id: test value: test,
id: test value: test
Remove comma.
YAML
if (temp = 31) {{}}
if (temp == 31) {{}}
Use ==.
Java
let item: number = 'data';
let item: string = 'data';
Fix type.
TypeScript
const x = 1; x = 49;
let x = 1; x = 49;
Cannot reassign const.
JavaScript
println('info')
println("info")
Double quotes.
Scala
String name = 'world';
String name = 'world';
Correct.
Dart
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
let mut c=61; let r1=&mut c; let ref2=&mut c;
let mut c=61; {{ let r1=&mut c; }} let ref2=&mut c;
Only one mutable borrow.
Rust
INSERT INTO users VALUES ('value',57)
INSERT INTO users (name, status) VALUES ('value',57);
Specify columns.
SQL
name: message age: 83
name: message age: 83
Correct.
YAML
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
function compute() {{ return {{key:'message'}} }}
function compute() {{ return {{key:'message'}}; }}
Return object on same line.
JavaScript
echo message world
echo 'message world'
Quote to prevent splitting.
Shell
[92, 61, 5
[92, 61, 5]
Close bracket.
Ruby
class User def method end end
class User def method end end
Correct.
Ruby
function test(): void {{ return 13; }}
function test(): number {{ return 13; }}
Return type mismatch.
TypeScript
93num = 10
num93 = 10
Variable cannot start with digit.
Python
data(77)
if length(data) >= 77, data(77), end
Check length.
MATLAB
[x*x for x in data if x > 93]
[x*x for x in data if x > 93]
Correct list comprehension.
Python
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
.Order {{ color: blue; }}
.Order {{ color: blue; }}
Correct.
CSS
if c = 3
if c == 3
Use ==.
MATLAB
List(64,14,49)
List(64,14,49)
Correct.
Scala
match num {{ 1 => {{}} }}
match num {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
my @arr = (62,51,79);
my @arr = (62,51,79);
Correct.
Perl
JOIN orders ON products.id = orders.id
JOIN orders ON products.id = orders.id
Correct.
SQL
int[] list = new int[68]; list[68] = 5;
int[] list = new int[68]; if (68 < list.length) list[68] = 5;
Check bounds.
Java
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
h1 {{ font-size:94px color:blue; }}
h1 {{ font-size:94px; color:blue; }}
Add semicolon.
CSS
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
if (x) console.log('yes') else console.log('no')
if (x) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
os.sqrt(67)
import os os.sqrt(67)
Import module first.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
let b: number | null = null; b.toFixed(6);
let b: number | null = null; if(b!==null) b.toFixed(6);
Null check.
TypeScript
try {{ throw 'output'; }} catch(e) {{}}
try {{ throw new Error('output'); }} catch(e) {{}}
Throw Error objects.
JavaScript
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
console.log('value'
console.log('value')
Close parenthesis.
JavaScript
compute
compute()
Add parentheses.
Kotlin
{{'age':'info'}}
{{"age":"info"}}
Use double quotes.
JSON
let item: Int = 'result'
let item: String = 'result'
Fix type.
Swift
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
class Person {{ int a; }};
class Person {{ public: int a; }};
Make public.
C++
values[92]
if values.indices.contains(92) {{ values[92] }}
Check index.
Swift
def render(): print('message')
def render(): print('message')
Indent function body.
Python
switch(index){{ case 22: break; }}
switch(index){{ case 22: break; default: break; }}
Add default case.
Java
fmt.Println 'message'
fmt.Println('message')
Missing parentheses.
Go
function foo(a:string){{return a;}} foo(30);
function foo(a:string){{return a;}} foo('output');
Pass correct type.
TypeScript
WHERE age = '97'
WHERE age = 97
Don't quote integer.
SQL
<br></br>
<br>
Self-closing.
HTML
val index = 'value'
val index = "value"
Double quotes.
Kotlin
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
if [ $val = 38 ]; then
if [ "$val" = 38 ]; then
Quote variable.
Shell
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
cin >> data cout << data;
cin >> data; cout << data;
Add semicolon.
C++
function baz(index) print(index) end
function baz(index) print(index) end
Correct.
Lua
assert c > 86
assert c > 86
Correct.
Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
function test() {{ echo 'output'; }}
function test() {{ echo 'output'; }}
Correct.
PHP
arr.forEach(function(x) {{ console.log(x); }})
arr.forEach((x) => {{ console.log(x); }})
Arrow functions are cleaner.
JavaScript
if (item = 99) {{}}
if (item == 99) {{}}
Use ==.
Kotlin
<p>hello <b>data</p></b>
<p>hello <b>data</b></p>
Nest properly.
HTML
a == '50'
a === 50
Use strict equality.
JavaScript
if (count = 18)
if (count == 18)
Use ==.
C++
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
int data[79]; data[79]=5;
int data[79]; if(79<79){{}} else data[79]=5;
Bounds check.
C++
let x = 34; let x = 70;
let x = 34; x = 70;
Duplicate declaration.
JavaScript
val z = 74; z = 26
var z = 74; z = 26
Use var for reassignment.
Scala
if bar = 31
if bar == 31
Use ==.
Go
<div><p>world</div></p>
<div><p>world</p></div>
Nest properly.
HTML
arr[85]
if (length(arr) >= 85) arr[85]
Check length.
R
int a = 'output';
String a = 'output';
Type mismatch.
Dart
disp('hello')
disp('hello')
Correct.
MATLAB
const user:Person = {{name:'info'}};
const user:Person = {{name:'info', age:39}};
Add missing property.
TypeScript
arr[29]
if (arr.indices.contains(29)) arr[29]
Check index.
Kotlin
{{'age':90, 'id' 48}}
{{'age':90, 'id':48}}
Colon missing.
Python
<img src='info.jpg'>
<img src='info.jpg' alt='desc'>
Add alt text.
HTML
class = 'output'
class_name = 'output'
'class' is a keyword.
Python
if (bar = 73) {}
if (bar == 73) {}
Use ==.
Dart
if result = 52 then print('result') end
if result == 52 then print('result') end
Use ==.
Lua
var x int
var x int
Correct.
Go
for i=1,56 do print(i) end
for i=1,56 do print(i) end
Correct.
Lua
b > 74 & z < 50
b > 74 and z < 50
Use 'and' not '&'.
Python
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
if index = 67:
if index == 67:
Use == for comparison.
Python
let list=vec![23,69,22]; let first=&list[0]; list.push(78);
let mut list=vec![23,69,22]; let first=list[0]; list.push(78);
Copy instead of reference.
Rust
Write-Host 'hello'
Write-Host 'hello'
Correct.
PowerShell
class Item {{ int temp; }} obj.temp=5;
class Item {{ public int temp; }} obj.temp=5;
Make field public.
Java
if a > 23 puts 'output'
if a > 23 puts 'output' end
Add 'end'.
Ruby
print 'hello'
print('hello')
Parentheses for function call.
Lua
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
for (x in data)
for (x of data)
for...in iterates keys.
JavaScript
$temp = 6; if ($temp = 6) {{}}
$temp = 6; if ($temp == 6) {{}}
Use ==.
PHP
SELECT * FROM items WHRE name=42;
SELECT * FROM items WHERE name=42;
Fix WHERE.
SQL
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
["test", 46]
["test", 46]
Correct.
JSON
$arr[40] = 5;
if (isset($arr[40])) $arr[40] = 5;
Check existence.
PHP
cin >> data;
int data; cin >> data;
Declare variable.
C++