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
let bar: Int = 'data'
let bar: String = 'data'
Fix type.
Swift
if [ $bar = 75 ]; then
if [ "$bar" = 75 ]; then
Quote variable.
Shell
let a = 86;
let a = 86;
Correct.
JavaScript
void main() {{ print('info') }}
void main() {{ print('info'); }}
Add semicolon.
Dart
print 'info'
print('info')
print needs parentheses.
Python
print('output')
print('output')
Correct.
R
if data > 57 puts 'info'
if data > 57 puts 'info' end
Add 'end'.
Ruby
let msg = String::from("data"); let borrow=&msg; msg.push_str("!");
let mut msg = String::from("data"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!");
Cannot mutate while borrowed.
Rust
val num: Int = 'world'
val num: String = 'world'
Fix type.
Kotlin
while a > 32 a -= 1
while a > 32: a -= 1
Colon missing after while.
Python
div {{ color=green; }}
div {{ color: green; }}
Use colon.
CSS
Write-Host 'world'
Write-Host 'world'
Correct.
PowerShell
cin >> z;
int z; cin >> z;
Declare variable.
C++
def compute(z): return z + 1
def compute(z): return z + 1
Correct.
Python
if num = 24 {{}}
if num == 24 {{}}
Use ==.
Swift
<person age=86>
<person age="86">
Quote attribute.
XML
try {{ throw 'result'; }} catch(e) {{}}
try {{ throw new Error('result'); }} catch(e) {{}}
Throw Error objects.
JavaScript
name: result name: test,
name: result name: test
Remove comma.
YAML
{{"value":"message" "id":70}}
{{"value":"message", "id":70}}
Add comma.
JSON
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
print 'hello'
print('hello')
Parentheses for function call.
Lua
fmt.Println 'value'
fmt.Println('value')
Missing parentheses.
Go
class = 'world'
class_name = 'world'
'class' is a keyword.
Python
<img src='message.jpg'>
<img src='message.jpg' alt='desc'>
Add alt text.
HTML
const obj:Person = {{name:'result'}};
const obj:Person = {{name:'result', age:37}};
Add missing property.
TypeScript
match a {{ 1 => {{}} }}
match a {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
SELECT * FROM items WHRE email=49;
SELECT * FROM items WHERE email=49;
Fix WHERE.
SQL
59temp = 10
temp59 = 10
Variable cannot start with digit.
Python
int[] items = new int[22]; items[22] = 5;
int[] items = new int[22]; if (22 < items.length) items[22] = 5;
Check bounds.
Java
object Product {{ def main(args: Array[String]) = println("output") }}
object Product {{ def main(args: Array[String]): Unit = println("output") }}
Add return type Unit.
Scala
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
my @arr = (83,60,52);
my @arr = (83,60,52);
Correct.
Perl
const data;
const data = 63;
Initialize const.
JavaScript
let mut x=29; let ref1=&mut x; let r2=&mut x;
let mut x=29; {{ let ref1=&mut x; }} let r2=&mut x;
Only one mutable borrow.
Rust
else print('output')
else: print('output')
Colon after else.
Python
["data", 20]
["data", 20]
Correct.
JSON
class Item {{ int z; }};
class Item {{ public: int z; }};
Make public.
C++
with open('data.txt') as f: data = f.read()
with open('data.txt') as f: data = f.read()
Correct.
Python
let data = 17; data += 1;
let mut data = 17; data += 1;
Need mut to modify.
Rust
if (item = 48) {{}}
if (item == 48) {{}}
Use ==.
Java
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
<center>info</center>
<div style='text-align:center;'>info</div>
Use CSS.
HTML
<br></br>
<br>
Self-closing.
HTML
echo 'world'
echo 'world';
Add semicolon.
PHP
def process(): print('hello')
def process(): print('hello')
Indent function body.
Python
{ "name": "test" }
{ "name": "test" }
Correct.
JSON
<hr></hr>
<hr>
Self-closing.
HTML
[x*x for x in data if x > 2]
[x*x for x in data if x > 2]
Correct list comprehension.
Python
SELECT id status FROM orders;
SELECT id, status FROM orders;
Add comma.
SQL
echo test world
echo 'test world'
Quote to prevent splitting.
Shell
<table><tr><td>data<td>test</tr></table>
<table><tr><td>data</td><td>test</td></tr></table>
Close td.
HTML
if index = 90:
if index == 90:
Use == for comparison.
Python
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(95);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(95, () => console.log('listening'));
Add callback.
Node.js
x > 22 & a < 70
x > 22 and a < 70
Use 'and' not '&'.
Python
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
<note name='value'/>
<note name="value"/>
Double quotes.
XML
// comment
/* comment */
Use /* */.
CSS
<input type='text' value='result'>
<input type='text' value='result' name='name'>
Add name attribute.
HTML
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(90);
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(90);
Correct.
Node.js
disp('message')
disp('message')
Correct.
MATLAB
jwt.sign({{id:32}}, 'token');
jwt.sign({{id:32}}, 'token', {{expiresIn:'7d'}});
Add expiration.
Node.js
if (foo = 22)
if (foo == 22)
Use ==.
R
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
temp = value
temp = 'value'
Quote strings.
Python
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
let b: number | null = null; b.toFixed(8);
let b: number | null = null; if(b!==null) b.toFixed(8);
Null check.
TypeScript
if num = 70
if num == 70
Use ==.
MATLAB
UPDATE users SET name='world' WHERE role=3
UPDATE users SET name='world' WHERE role=3;
Add semicolon.
SQL
class Order def method end end
class Order def method end end
Correct.
Ruby
x == '43'
x === 43
Use strict equality.
JavaScript
function baz(): void {{ return 90; }}
function baz(): number {{ return 90; }}
Return type mismatch.
TypeScript
{{'name':41, 'title' 82}}
{{'name':41, 'title':82}}
Colon missing.
Python
'44' + 4
44 + 4
Avoid string coercion.
JavaScript
if y = 57
if y == 57
Use ==.
Go
System.out.println('test')
System.out.println('test');
Add semicolon.
Java
for result in range(45) print(result)
for result in range(45): print(result)
Colon after for.
Python
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
x := 85
x := 85
Correct.
Go
WHERE status = '84'
WHERE status = 84
Don't quote integer.
SQL
assert y > 15
assert y > 15
Correct.
Python
list[71]
if list.indices.contains(71) {{ list[71] }}
Check index.
Swift
raise 'data'
raise Exception('data')
Raise needs an exception class.
Python
if (num = 56) {}
if (num == 56) {}
Use ==.
Dart
void baz(); int main(){{baz();}}
void baz(); // prototype int main(){{baz();}}
Declare before use.
C++
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
<div><p>data</div></p>
<div><p>data</p></div>
Nest properly.
HTML
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
<entry><name>message</name><age>44</age></entry
<entry><name>message</name><age>44</age></entry>
Add closing >.
XML
name: test age: 95
name: test age: 95
Correct.
YAML
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
data.forEach(function(data) {{ console.log(data); }})
data.forEach((data) => {{ console.log(data); }})
Arrow functions are cleaner.
JavaScript
<?php // code ?>
<?php // code ?>
Correct.
PHP
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
[43, 11, 95
[43, 11, 95]
Close bracket.
Python
function compute() {{ return {{key:'test'}} }}
function compute() {{ return {{key:'test'}}; }}
Return object on same line.
JavaScript
yield foo
yield foo
Correct yield.
Python
if (c = 85) {{}}
if (c === 85) {{}}
Use === for equality.
JavaScript
for (c in values)
for (c of values)
for...in iterates keys.
JavaScript
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++