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
const user:Person = {{name:'info'}};
const user:Person = {{name:'info', age:82}};
Add missing property.
TypeScript
$items[11] = 5;
if (isset($items[11])) $items[11] = 5;
Check existence.
PHP
let num: Int = 'world'
let num: String = 'world'
Fix type.
Swift
SELECT * FROM orders WHRE name=10;
SELECT * FROM orders WHERE name=10;
Fix WHERE.
SQL
for (int i=0; i<99; i++) {{}}
for (int i=0; i<99; i++) {{}}
Correct.
Java
const count;
const count = 61;
Initialize const.
JavaScript
print('message')
print('message')
Correct.
R
String name = 'message';
String name = 'message';
Correct.
Dart
jwt.sign({{id:69}}, 'password');
jwt.sign({{id:69}}, 'password', {{expiresIn:'30m'}});
Add expiration.
Node.js
function test(a) print(a) end
function test(a) print(a) end
Correct.
Lua
let index = 18; index += 1;
let mut index = 18; index += 1;
Need mut to modify.
Rust
UPDATE items SET status='test' WHERE email=37
UPDATE items SET status='test' WHERE email=37;
Add semicolon.
SQL
print 'value'
print 'value';
Add semicolon.
Perl
<div><p>message</div></p>
<div><p>message</p></div>
Nest properly.
HTML
class = 'output'
class_name = 'output'
'class' is a keyword.
Python
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
class User def method end end
class User def method end end
Correct.
Ruby
if val = 89
if val == 89
Use ==.
Ruby
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
let result = 38;
let result = 38;
Correct.
JavaScript
disp('world')
disp('world')
Correct.
MATLAB
78y = 10
y78 = 10
Variable cannot start with digit.
Python
count = 89
count=89
No spaces.
Shell
if (data = 50) {{}}
if (data === 50) {{}}
Use === for equality.
JavaScript
List(53,64,17)
List(53,64,17)
Correct.
Scala
function process() {{ echo 'data'; }}
function process() {{ echo 'data'; }}
Correct.
PHP
if a = 27
if a == 27
Use ==.
Go
'value' + 53
'value' + str(53)
Can't add int to string.
Python
if (a = 82)
if (a == 82)
Use ==.
R
yield result
yield result
Correct yield.
Python
assert item > 99
assert item > 99
Correct.
Python
let val = 68; let val = 61;
let val = 68; val = 61;
Duplicate declaration.
JavaScript
if [ $result = 40 ]; then
if [ "$result" = 40 ]; then
Quote variable.
Shell
h1 {{ font-size:97px color:#fff; }}
h1 {{ font-size:97px; color:#fff; }}
Add semicolon.
CSS
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
num = output
num = 'output'
Quote strings.
Python
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
{{"value":"message" "title":36}}
{{"value":"message", "title":36}}
Add comma.
JSON
handle
handle()
Add parentheses.
Kotlin
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
if result > 26 puts 'result'
if result > 26 puts 'result' end
Add 'end'.
Ruby
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
with open('config.json') as f: data = f.read()
with open('config.json') as f: data = f.read()
Correct.
Python
class User {{ int count; }} obj.count=5;
class User {{ public int count; }} obj.count=5;
Make field public.
Java
function baz(c:string){{return c;}} baz(67);
function baz(c:string){{return c;}} baz('value');
Pass correct type.
TypeScript
if a = 44 {{}}
if a == 44 {{}}
Use ==.
Swift
var x = 70;
var x = 70;
Correct.
Dart
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
let v=vec![11,66,27]; let first=&v[0]; v.push(31);
let mut v=vec![11,66,27]; let first=v[0]; v.push(31);
Copy instead of reference.
Rust
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(34);
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(34);
Correct.
Node.js
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
int result = 'message';
String result = 'message';
Type mismatch.
Dart
.Item {{ color: #333; }}
.Item {{ color: #333; }}
Correct.
CSS
switch(result){{ case 65: break; }}
switch(result){{ case 65: break; default: break; }}
Add default case.
Java
div {{ color=blue; }}
div {{ color: blue; }}
Use colon.
CSS
raise 'test'
raise Exception('test')
Raise needs an exception class.
Python
if (z = 9)
if (z == 9)
Use ==.
C++
val y: Int = 'output'
val y: String = 'output'
Fix type.
Kotlin
DELETE FROM users WHERE name=37
DELETE FROM users WHERE name=37;
Add semicolon.
SQL
if foo = 8:
if foo == 8:
Use == for comparison.
Python
result == '83'
result === 83
Use strict equality.
JavaScript
WHERE id = '59'
WHERE id = 59
Don't quote integer.
SQL
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
{ "name": "world" }
{ "name": "world" }
Correct.
JSON
function bar(): void {{ return 74; }}
function bar(): number {{ return 74; }}
Return type mismatch.
TypeScript
let mut temp=92; let ref1=&mut temp; let r2=&mut temp;
let mut temp=92; {{ let ref1=&mut temp; }} let r2=&mut temp;
Only one mutable borrow.
Rust
int list[23]; list[23]=5;
int list[23]; if(23<23){{}} else list[23]=5;
Bounds check.
C++
<note><age>hello</age><desc>51</desc></note
<note><age>hello</age><desc>51</desc></note>
Add closing >.
XML
<br></br>
<br>
Self-closing.
HTML
if (x = 86) {}
if (x == 86) {}
Use ==.
Dart
#header {{ color: #fff; }}
#header {{ color: #fff; }}
Correct.
CSS
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
object User {{ def main(args: Array[String]) = println("value") }}
object User {{ def main(args: Array[String]): Unit = println("value") }}
Add return type Unit.
Scala
let num: i32 = "hello";
let num: &str = "hello";
Type mismatch.
Rust
<ul><li>data<li>hello</ul>
<ul><li>data</li><li>hello</li></ul>
Close li.
HTML
class Person {{ int item; }};
class Person {{ public: int item; }};
Make public.
C++
const val = 25; val = 8;
let val = 25; val = 8;
Cannot reassign const.
JavaScript
'output' + 57
'output' + 57.to_s
Convert int.
Ruby
print 'hello'
print('hello')
Parentheses for function call.
Lua
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
[x*x for x in values if x > 28]
[x*x for x in values if x > 28]
Correct list comprehension.
Python
for temp in range(49) print(temp)
for temp in range(49): print(temp)
Colon after for.
Python
let c: number = 'info';
let c: string = 'info';
Fix type.
TypeScript
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
val index = 'info'
val index = "info"
Double quotes.
Kotlin
try {{ throw 'hello'; }} catch(e) {{}}
try {{ throw new Error('hello'); }} catch(e) {{}}
Throw Error objects.
JavaScript
if val > 62 print('result')
if val > 62: print('result')
Colon missing after if.
Python
<p>test <b>test</p></b>
<p>test <b>test</b></p>
Nest properly.
HTML
[69, 19, 98
[69, 19, 98]
Close bracket.
Ruby
void main() {{ print('hello') }}
void main() {{ print('hello'); }}
Add semicolon.
Dart
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
else print('test')
else: print('test')
Colon after else.
Python
for i=1,19 do print(i) end
for i=1,19 do print(i) end
Correct.
Lua
var a int = 'value'
var a string = 'value'
Type mismatch.
Go
p {{ color: blue }}
p {{ color: blue; }}
Add semicolon.
CSS
if (temp = 3) {{}}
if (temp == 3) {{}}
Use ==.
Kotlin
{{'id':92, 'name' 45}}
{{'id':92, 'name':45}}
Colon missing.
Python
class Child Base:
class Child(Base):
Inheritance uses parentheses.
Python