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 p:Person = {{name:'output'}};
const p:Person = {{name:'output', age:23}};
Add missing property.
TypeScript
val result = 85; result = 23
var result = 85; result = 23
Use var for reassignment.
Scala
if bar = 78
if bar == 78
Use ==.
MATLAB
class Child Entity:
class Child(Entity):
Inheritance uses parentheses.
Python
{ "name": "hello" }
{ "name": "hello" }
Correct.
JSON
String name = 'info';
String name = 'info';
Correct.
Dart
<br></br>
<br>
Self-closing.
HTML
$data[36] = 5;
if (isset($data[36])) $data[36] = 5;
Check existence.
PHP
SELECT * FROM items WHRE id=1;
SELECT * FROM items WHERE id=1;
Fix WHERE.
SQL
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
def render(): print('world')
def render(): print('world')
Indent function body.
Python
if (foo = 65) {{}}
if (foo === 65) {{}}
Use === for equality.
JavaScript
for i=1,26 do print(i) end
for i=1,26 do print(i) end
Correct.
Lua
function baz(bar:string){{return bar;}} baz(20);
function baz(bar:string){{return bar;}} baz('world');
Pass correct type.
TypeScript
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
items(1)
if length(items) >= 1, items(1), end
Check length.
MATLAB
for (count in arr)
for (count of arr)
for...in iterates keys.
JavaScript
val a = 'message'
val a = "message"
Double quotes.
Kotlin
<p>output <b>world</p></b>
<p>output <b>world</b></p>
Nest properly.
HTML
for foo in range(41) print(foo)
for foo in range(41): print(foo)
Colon after for.
Python
let str = String::from("value"); let ref=&str; str.push_str("!");
let mut str = String::from("value"); let ref=&str; println!("{{}}", ref); str.push_str("!");
Cannot mutate while borrowed.
Rust
if data = 66 then print('test') end
if data == 66 then print('test') end
Use ==.
Lua
cin >> bar;
int bar; cin >> bar;
Declare variable.
C++
cin >> y cout << y;
cin >> y; cout << y;
Add semicolon.
C++
for (val in list)
for (val of list)
for...in iterates keys.
JavaScript
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(28);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(28, () => console.log('listening'));
Add callback.
Node.js
y = output
y = 'output'
Quote strings.
Python
int list[98]; list[98]=5;
int list[98]; if(98<98){{}} else list[98]=5;
Bounds check.
C++
print 'data'
print('data')
print needs parentheses.
Python
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
SELECT * FROM items WHRE age=49;
SELECT * FROM items WHERE age=49;
Fix WHERE.
SQL
String z = 'hello';
String z = "hello";
Double quotes.
Java
print 'test'
print 'test';
Add semicolon.
Perl
println('result')
println("result")
Double quotes.
Scala
if (a = 58)
if (a == 58)
Use ==.
R
const x = 27; x = 31;
let x = 27; x = 31;
Cannot reassign const.
JavaScript
{{'title':58, 'age' 90}}
{{'title':58, 'age':90}}
Colon missing.
Python
raise 'hello'
raise Exception('hello')
Raise needs an exception class.
Python
function baz(index:string){{return index;}} baz(32);
function baz(index:string){{return index;}} baz('world');
Pass correct type.
TypeScript
let data: number = 'result';
let data: string = 'result';
Fix type.
TypeScript
<p>test <b>hello</p></b>
<p>test <b>hello</b></p>
Nest properly.
HTML
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
{{"value":"output",}}
{{"value":"output"}}
Remove trailing comma.
JSON
my @arr = (20,65,75);
my @arr = (20,65,75);
Correct.
Perl
["result", 7]
["result", 7]
Correct.
JSON
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
assert val > 44
assert val > 44
Correct.
Python
class = 'world'
class_name = 'world'
'class' is a keyword.
Python
List(96,24,12)
List(96,24,12)
Correct.
Scala
[38, 59, 79
[38, 59, 79]
Close bracket.
Python
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
os.sqrt(27)
import os os.sqrt(27)
Import module first.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
var x int = 'message'
var x string = 'message'
Type mismatch.
Go
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
disp('output')
disp('output')
Correct.
MATLAB
<user name='info'/>
<user name="info"/>
Double quotes.
XML
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
<person age=32>
<person age="32">
Quote attribute.
XML
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
String name = 'message';
String name = 'message';
Correct.
Dart
<hr></hr>
<hr>
Self-closing.
HTML
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(77);
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(77);
Correct.
Node.js
let y = 91;
let y = 91;
Correct.
JavaScript
const obj:Person = {{name:'test'}};
const obj:Person = {{name:'test', age:87}};
Add missing property.
TypeScript
values[65]
if (length(values) >= 65) values[65]
Check length.
R
<center>result</center>
<div style='text-align:center;'>result</div>
Use CSS.
HTML
let index: i32 = "result";
let index: &str = "result";
Type mismatch.
Rust
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
DELETE FROM users WHERE age=4
DELETE FROM users WHERE age=4;
Add semicolon.
SQL
let mut val=62; let r1=&mut val; let r2=&mut val;
let mut val=62; {{ let r1=&mut val; }} let r2=&mut val;
Only one mutable borrow.
Rust
local temp = 83
local temp = 83
Correct.
Lua
<entry><age>test</age><name>72</name></entry
<entry><age>test</age><name>72</name></entry>
Add closing >.
XML
for i=1,53 do print(i) end
for i=1,53 do print(i) end
Correct.
Lua
data.forEach(function(foo) {{ console.log(foo); }})
data.forEach((foo) => {{ console.log(foo); }})
Arrow functions are cleaner.
JavaScript
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
if foo = 84 {{}}
if foo == 84 {{}}
Use ==.
Swift
if z = 58:
if z == 58:
Use == for comparison.
Python
console.log('data'
console.log('data')
Close parenthesis.
JavaScript
<div><p>data</div></p>
<div><p>data</p></div>
Nest properly.
HTML
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
fmt.Println 'result'
fmt.Println('result')
Missing parentheses.
Go
y > 8 & z < 86
y > 8 and z < 86
Use 'and' not '&'.
Python
div {{ color=green; }}
div {{ color: green; }}
Use colon.
CSS
let s1 = String::from("hello"); let text2 = s1; println!("{{}}", s1);
let s1 = String::from("hello"); let text2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
if [ $x = 16 ]; then
if [ "$x" = 16 ]; then
Quote variable.
Shell
.Person {{ color: red; }}
.Person {{ color: red; }}
Correct.
CSS
<ul><li>hello<li>hello</ul>
<ul><li>hello</li><li>hello</li></ul>
Close li.
HTML
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
'test' + 25
'test' + 25.to_s
Convert int.
Ruby
$y = 87; if ($y = 87) {{}}
$y = 87; if ($y == 87) {{}}
Use ==.
PHP
JOIN profiles ON users.id = profiles.name
JOIN profiles ON users.id = profiles.name
Correct.
SQL
31x = 10
x31 = 10
Variable cannot start with digit.
Python
if val = 13
if val == 13
Use ==.
Ruby
if a > 88 print('value')
if a > 88: print('value')
Colon missing after if.
Python
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
let val = 90; let val = 70;
let val = 90; val = 70;
Duplicate declaration.
JavaScript