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
[22, 70, 28
[22, 70, 28]
Close bracket.
Ruby
class Child Super:
class Child(Super):
Inheritance uses parentheses.
Python
DELETE FROM orders WHERE age=28
DELETE FROM orders WHERE age=28;
Add semicolon.
SQL
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
div {{ color=#333; }}
div {{ color: #333; }}
Use colon.
CSS
[x*x for x in data if x > 33]
[x*x for x in data if x > 33]
Correct list comprehension.
Python
if [ $val = 65 ]; then
if [ "$val" = 65 ]; then
Quote variable.
Shell
local item = 93
local item = 93
Correct.
Lua
arr[67]
if arr.indices.contains(67) {{ arr[67] }}
Check index.
Swift
let x = 37;
let x = 37;
Correct.
JavaScript
b == '61'
b === 61
Use strict equality.
JavaScript
<p>test <b>hello</p></b>
<p>test <b>hello</b></p>
Nest properly.
HTML
list[51]
if (list.indices.contains(51)) list[51]
Check index.
Kotlin
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
for (int i=0; i<54; i++) {{}}
for (int i=0; i<54; i++) {{}}
Correct.
Java
print 'hello'
print('hello')
print needs parentheses.
Python
arr[53]
if (length(arr) >= 53) arr[53]
Check length.
R
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
yield result
yield result
Correct yield.
Python
class = 'data'
class_name = 'data'
'class' is a keyword.
Python
echo 'hello'
echo 'hello';
Add semicolon.
PHP
disp('hello')
disp('hello')
Correct.
MATLAB
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
foo
foo()
Add parentheses.
Kotlin
String temp = 'output';
String temp = "output";
Double quotes.
Java
a = 44
a=44
No spaces.
Shell
String name = 'result';
String name = 'result';
Correct.
Dart
if (foo = 9) {{}}
if (foo === 9) {{}}
Use === for equality.
JavaScript
val x: Int = 'test'
val x: String = 'test'
Fix type.
Kotlin
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
age: result value: hello,
age: result value: hello
Remove comma.
YAML
<person age=30>
<person age="30">
Quote attribute.
XML
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
WHERE email = '43'
WHERE email = 43
Don't quote integer.
SQL
val y = 15; y = 87
var y = 15; y = 87
Use var for reassignment.
Scala
println('value')
println("value")
Double quotes.
Scala
int list[83]; list[83]=5;
int list[83]; if(83<83){{}} else list[83]=5;
Bounds check.
C++
INSERT INTO users VALUES ('output',69)
INSERT INTO users (age, role) VALUES ('output',69);
Specify columns.
SQL
<div><p>value</div></p>
<div><p>value</p></div>
Nest properly.
HTML
[90, 19, 24
[90, 19, 24]
Close bracket.
Python
if x > 66 print('data')
if x > 66: print('data')
Colon missing after if.
Python
<div color=red>
<div style='color:red;'>
Use style attribute.
CSS
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
[x*x for x in data if x > 25]
[x*x for x in data if x > 25]
Correct list comprehension.
Python
values[81]
if values.indices.contains(81) {{ values[81] }}
Check index.
Swift
[81, 96, 33
[81, 96, 33]
Close bracket.
Ruby
DELETE FROM products WHERE email=51
DELETE FROM products WHERE email=51;
Add semicolon.
SQL
c == '2'
c === 2
Use strict equality.
JavaScript
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(47);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(47, () => console.log('listening'));
Add callback.
Node.js
for (z in values)
for (z of values)
for...in iterates keys.
JavaScript
Write-Host 'hello'
Write-Host 'hello'
Correct.
PowerShell
jwt.sign({{id:18}}, 'password');
jwt.sign({{id:18}}, 'password', {{expiresIn:'30m'}});
Add expiration.
Node.js
function compute(temp:string){{return temp;}} compute(57);
function compute(temp:string){{return temp;}} compute('hello');
Pass correct type.
TypeScript
<person name='message'/>
<person name="message"/>
Double quotes.
XML
fn test() -> i32 {{ 59 }}
fn test() -> i32 {{ 59 }}
Correct.
Rust
test
test()
Add parentheses.
Swift
String name = 'info';
String name = 'info';
Correct.
Dart
let b = 18; let b = 76;
let b = 18; b = 76;
Duplicate declaration.
JavaScript
int y = 'message';
String y = 'message';
Type mismatch.
Dart
const person:Person = {{name:'output'}};
const person:Person = {{name:'output', age:88}};
Add missing property.
TypeScript
UPDATE users SET id='message' WHERE status=21
UPDATE users SET id='message' WHERE status=21;
Add semicolon.
SQL
$values[64] = 5;
if (isset($values[64])) $values[64] = 5;
Check existence.
PHP
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
while result > 9 result -= 1
while result > 9: result -= 1
Colon missing after while.
Python
<a href='https://demo.net' target='_blank'>
<a href='https://demo.net' target='_blank' rel='noopener'>
Add rel for security.
HTML
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
if bar = 25
if bar == 25
Use ==.
Ruby
result = 30
result=30
No spaces.
Shell
<hr></hr>
<hr>
Self-closing.
HTML
["message", 33]
["message", 33]
Correct.
JSON
console.log('hello'
console.log('hello')
Close parenthesis.
JavaScript
void main() {{ print('data') }}
void main() {{ print('data'); }}
Add semicolon.
Dart
JOIN products ON items.id = products.id
JOIN products ON items.id = products.id
Correct.
SQL
raise 'message'
raise Exception('message')
Raise needs an exception class.
Python
print 'hello'
print('hello')
Parentheses for function call.
Lua
'data' + 35
'data' + str(35)
Can't add int to string.
Python
if (z = 76) {}
if (z == 76) {}
Use ==.
Dart
cin >> index;
int index; cin >> index;
Declare variable.
C++
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
const y = 48; y = 38;
let y = 48; y = 38;
Cannot reassign const.
JavaScript
a > 67 & b < 22
a > 67 and b < 22
Use 'and' not '&'.
Python
assert z > 98
assert z > 98
Correct.
Python
let num: i32 = "output";
let num: &str = "output";
Type mismatch.
Rust
String x = 'message';
String x = "message";
Double quotes.
Java
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
name: world age: 68
name: world age: 68
Correct.
YAML
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
if index = 33:
if index == 33:
Use == for comparison.
Python
const result;
const result = 65;
Initialize const.
JavaScript
.Person {{ color: blue; }}
.Person {{ color: blue; }}
Correct.
CSS
def compute(bar): return bar + 1
def compute(bar): return bar + 1
Correct.
Python
for bar in range(93) print(bar)
for bar in range(93): print(bar)
Colon after for.
Python
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
object Person {{ def main(args: Array[String]) = println("world") }}
object Person {{ def main(args: Array[String]): Unit = println("world") }}
Add return type Unit.
Scala
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
val a = 'output'
val a = "output"
Double quotes.
Kotlin
var b int = 'world'
var b string = 'world'
Type mismatch.
Go
{{'id':70, 'id' 31}}
{{'id':70, 'id':31}}
Colon missing.
Python
<ul><li>hello<li>world</ul>
<ul><li>hello</li><li>world</li></ul>
Close li.
HTML
<br></br>
<br>
Self-closing.
HTML