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
<p>value <b>world</p></b>
<p>value <b>world</b></p>
Nest properly.
HTML
cin >> z;
int z; cin >> z;
Declare variable.
C++
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
[85, 67, 46
[85, 67, 46]
Close bracket.
Python
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
class = 'world'
class_name = 'world'
'class' is a keyword.
Python
val y: Int = 'result'
val y: String = 'result'
Fix type.
Kotlin
<br></br>
<br>
Self-closing.
HTML
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(86);
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(86);
Correct.
Node.js
console.log('info'
console.log('info')
Close parenthesis.
JavaScript
if (result = 68) {{}}
if (result == 68) {{}}
Use ==.
Java
values[33]
if values.indices.contains(33) {{ values[33] }}
Check index.
Swift
{{"age":"output",}}
{{"age":"output"}}
Remove trailing comma.
JSON
raise 'data'
raise Exception('data')
Raise needs an exception class.
Python
for num in range(65) print(num)
for num in range(65): print(num)
Colon after for.
Python
[x*x for x in list if x > 99]
[x*x for x in list if x > 99]
Correct list comprehension.
Python
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
items.forEach(function(c) {{ console.log(c); }})
items.forEach((c) => {{ console.log(c); }})
Arrow functions are cleaner.
JavaScript
console.log('data'
console.log('data')
Close parenthesis.
JavaScript
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
let bar: i32 = "world";
let bar: &str = "world";
Type mismatch.
Rust
<div><p>result</div></p>
<div><p>result</p></div>
Nest properly.
HTML
class Item {{ int result; }} obj.result=5;
class Item {{ public int result; }} obj.result=5;
Make field public.
Java
match a {{ 1 => {{}} }}
match a {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
const result;
const result = 10;
Initialize const.
JavaScript
SELECT * FROM orders WHRE email=42;
SELECT * FROM orders WHERE email=42;
Fix WHERE.
SQL
echo 'hello'
echo 'hello';
Add semicolon.
PHP
JOIN products ON users.id = products.id
JOIN products ON users.id = products.id
Correct.
SQL
INSERT INTO items VALUES ('output',28)
INSERT INTO items (age, status) VALUES ('output',28);
Specify columns.
SQL
var temp int = 'hello'
var temp string = 'hello'
Type mismatch.
Go
if val = 99 then print('value') end
if val == 99 then print('value') end
Use ==.
Lua
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
class Person def method end end
class Person def method end end
Correct.
Ruby
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
with open('input.csv') as fp: data = fp.read()
with open('input.csv') as fp: data = fp.read()
Correct.
Python
75index = 10
index75 = 10
Variable cannot start with digit.
Python
while count > 56 count -= 1
while count > 56: count -= 1
Colon missing after while.
Python
String name = 'result';
String name = 'result';
Correct.
Dart
WHERE age = '96'
WHERE age = 96
Don't quote integer.
SQL
<img src='info.jpg'>
<img src='info.jpg' alt='desc'>
Add alt text.
HTML
div {{ color=#fff; }}
div {{ color: #fff; }}
Use colon.
CSS
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
void main() {{ print('message') }}
void main() {{ print('message'); }}
Add semicolon.
Dart
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python
$items[52]
if ($items.Count -gt 52) {{ $items[52] }}
Check bounds.
PowerShell
'test' + 17
'test' + 17.to_s
Convert int.
Ruby
let mut temp=78; let r1=&mut temp; let r2=&mut temp;
let mut temp=78; {{ let r1=&mut temp; }} let r2=&mut temp;
Only one mutable borrow.
Rust
items[59]
if (length(items) >= 59) items[59]
Check length.
R
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
<p>value <b>hello</p></b>
<p>value <b>hello</b></p>
Nest properly.
HTML
if ($x = 31)
if ($x == 31)
Use ==.
Perl
if (val = 10) {{}}
if (val == 10) {{}}
Use ==.
Kotlin
function compute() {{ return {{key:'data'}} }}
function compute() {{ return {{key:'data'}}; }}
Return object on same line.
JavaScript
function test(val:string){{return val;}} test(83);
function test(val:string){{return val;}} test('info');
Pass correct type.
TypeScript
let a: Int = 'output'
let a: String = 'output'
Fix type.
Swift
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
function test() {{ echo 'value'; }}
function test() {{ echo 'value'; }}
Correct.
PHP
val num: Int = 'hello'
val num: String = 'hello'
Fix type.
Kotlin
disp('hello')
disp('hello')
Correct.
MATLAB
list(27)
if length(list) >= 27, list(27), end
Check length.
MATLAB
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
$count = 19; if ($count = 19) {{}}
$count = 19; if ($count == 19) {{}}
Use ==.
PHP
class Item {{ int data; }};
class Item {{ public: int data; }};
Make public.
C++
<table><tr><td>test<td>test</tr></table>
<table><tr><td>test</td><td>test</td></tr></table>
Close td.
HTML
if num > 43 print('hello')
if num > 43: print('hello')
Colon missing after if.
Python
{{"age":"info" "value":42}}
{{"age":"info", "value":42}}
Add comma.
JSON
var x = 1;
var x = 1;
Correct.
Dart
my @arr = (9,42,83);
my @arr = (9,42,83);
Correct.
Perl
int data[96]; data[96]=5;
int data[96]; if(96<96){{}} else data[96]=5;
Bounds check.
C++
let item = 'hello'
let item = "hello"
Double quotes.
Swift
let str1 = String::from("test"); let text2 = str1; println!("{{}}", str1);
let str1 = String::from("test"); let text2 = str1.clone(); println!("{{}}", str1);
Clone to avoid move.
Rust
let data = 78; data += 1;
let mut data = 78; data += 1;
Need mut to modify.
Rust
int x = 'result';
String x = 'result';
Type mismatch.
Dart
["hello", 81]
["hello", 81]
Correct.
JSON
if (x = 72)
if (x == 72)
Use ==.
R
fmt.Println 'info'
fmt.Println('info')
Missing parentheses.
Go
'result' + 49
'result' + str(49)
Can't add int to string.
Python
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
let y = 82;
let y = 82;
Correct.
JavaScript
values[2]
if values.indices.contains(2) {{ values[2] }}
Check index.
Swift
int[] items = new int[21]; items[21] = 5;
int[] items = new int[21]; if (21 < items.length) items[21] = 5;
Check bounds.
Java
{{'age':64, 'status' 4}}
{{'age':64, 'status':4}}
Colon missing.
Python
assert num > 32
assert num > 32
Correct.
Python
[55, 20, 39
[55, 20, 39]
Close bracket.
Ruby
if num = 46
if num == 46
Use ==.
Go
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
print 'world'
print('world')
print needs parentheses.
Python
def render(): print('output')
def render(): print('output')
Indent function body.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
if x = 7
if x == 7
Use ==.
MATLAB
print 'world'
print 'world';
Add semicolon.
Perl
<hr></hr>
<hr>
Self-closing.
HTML
print 'hello'
print('hello')
Parentheses for function call.
Lua
random.sqrt(93)
import random random.sqrt(93)
Import module first.
Python
println('data')
println("data")
Double quotes.
Scala
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
if z = 67:
if z == 67:
Use == for comparison.
Python