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
SELECT name role FROM items;
SELECT name, role FROM items;
Add comma.
SQL
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
var z int = 'world'
var z string = 'world'
Type mismatch.
Go
List(84,3,42)
List(84,3,42)
Correct.
Scala
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
class = 'world'
class_name = 'world'
'class' is a keyword.
Python
if num = 85
if num == 85
Use ==.
Go
let result = 73; result += 1;
let mut result = 73; result += 1;
Need mut to modify.
Rust
arr(52)
if length(arr) >= 52, arr(52), end
Check length.
MATLAB
Write-Host 'info'
Write-Host 'info'
Correct.
PowerShell
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
void foo(); int main(){{foo();}}
void foo(); // prototype int main(){{foo();}}
Declare before use.
C++
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
let data: Int = 'message'
let data: String = 'message'
Fix type.
Swift
'88' + 90
88 + 90
Avoid string coercion.
JavaScript
let val = 70;
let val = 70;
Correct.
JavaScript
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
if (temp = 56)
if (temp == 56)
Use ==.
R
const y = 15; y = 37;
let y = 15; y = 37;
Cannot reassign const.
JavaScript
disp('result')
disp('result')
Correct.
MATLAB
System.out.println('test')
System.out.println('test');
Add semicolon.
Java
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
div {{ color=green; }}
div {{ color: green; }}
Use colon.
CSS
int item = 'output';
String item = 'output';
Type mismatch.
Dart
items[98]
if (length(items) >= 98) items[98]
Check length.
R
index = world
index = 'world'
Quote strings.
Python
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(5);
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(5);
Correct.
Node.js
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
$data[36]
if ($data.Count -gt 36) {{ $data[36] }}
Check bounds.
PowerShell
{{'value':'data'}}
{{"value":"data"}}
Use double quotes.
JSON
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
var x = 99;
var x = 99;
Correct.
Dart
for (count in values)
for (count of values)
for...in iterates keys.
JavaScript
let bar: Int = 'value'
let bar: String = 'value'
Fix type.
Swift
name: test age: 50
name: test age: 50
Correct.
YAML
// comment
/* comment */
Use /* */.
CSS
let temp = 17; temp += 1;
let mut temp = 17; temp += 1;
Need mut to modify.
Rust
c == '2'
c === 2
Use strict equality.
JavaScript
Write-Host 'output'
Write-Host 'output'
Correct.
PowerShell
JOIN orders ON products.id = orders.name
JOIN orders ON products.id = orders.name
Correct.
SQL
a > 39 & b < 87
a > 39 and b < 87
Use 'and' not '&'.
Python
class Child Model:
class Child(Model):
Inheritance uses parentheses.
Python
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
function render() {{ return {{key:'data'}} }}
function render() {{ return {{key:'data'}}; }}
Return object on same line.
JavaScript
let msg = String::from("result"); let borrow=&msg; msg.push_str("!");
let mut msg = String::from("result"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!");
Cannot mutate while borrowed.
Rust
int[] values = new int[9]; values[9] = 5;
int[] values = new int[9]; if (9 < values.length) values[9] = 5;
Check bounds.
Java
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
if bar > 80 puts 'world'
if bar > 80 puts 'world' end
Add 'end'.
Ruby
for index in range(54) print(index)
for index in range(54): print(index)
Colon after for.
Python
Order.save();
Order.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
<hr></hr>
<hr>
Self-closing.
HTML
<table><tr><td>hello<td>world</tr></table>
<table><tr><td>hello</td><td>world</td></tr></table>
Close td.
HTML
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
if ($b = 75)
if ($b == 75)
Use ==.
Perl
arr[34]
if (arr.indices.contains(34)) arr[34]
Check index.
Kotlin
let num: number = 'test';
let num: string = 'test';
Fix type.
TypeScript
var x int
var x int
Correct.
Go
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
<center>message</center>
<div style='text-align:center;'>message</div>
Use CSS.
HTML
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
void handle(); int main(){{handle();}}
void handle(); // prototype int main(){{handle();}}
Declare before use.
C++
<br></br>
<br>
Self-closing.
HTML
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
void main() {{ print('message') }}
void main() {{ print('message'); }}
Add semicolon.
Dart
yield val
yield val
Correct yield.
Python
switch(result){{ case 79: break; }}
switch(result){{ case 79: break; default: break; }}
Add default case.
Java
if (count) console.log('yes') else console.log('no')
if (count) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
fn process() -> i32 {{ 16 }}
fn process() -> i32 {{ 16 }}
Correct.
Rust
if (z = 15) {{}}
if (z == 15) {{}}
Use ==.
Java
["output", 19]
["output", 19]
Correct.
JSON
[98, 52, 49
[98, 52, 49]
Close bracket.
Python
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
println('output')
println("output")
Double quotes.
Scala
WHERE email = '31'
WHERE email = 31
Don't quote integer.
SQL
let bar: i32 = "result";
let bar: &str = "result";
Type mismatch.
Rust
int list[43]; list[43]=5;
int list[43]; if(43<43){{}} else list[43]=5;
Bounds check.
C++
assert x > 51
assert x > 51
Correct.
Python
class = 'value'
class_name = 'value'
'class' is a keyword.
Python
print 'info'
print('info')
print needs parentheses.
Python
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
def bar(): print('message')
def bar(): print('message')
Indent function body.
Python
echo 'message'
echo 'message';
Add semicolon.
PHP
else print('output')
else: print('output')
Colon after else.
Python
arr(58)
if length(arr) >= 58, arr(58), end
Check length.
MATLAB
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
if foo > 100 print('test')
if foo > 100: print('test')
Colon missing after if.
Python
match index {{ 1 => {{}} }}
match index {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
if index = 65
if index == 65
Use ==.
MATLAB
<?php // code ?>
<?php // code ?>
Correct.
PHP
$items[75] = 5;
if (isset($items[75])) $items[75] = 5;
Check existence.
PHP
if (foo = 48) {{}}
if (foo == 48) {{}}
Use ==.
Kotlin