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
[58, 10, 4
[58, 10, 4]
Close bracket.
Ruby
cin >> bar cout << bar;
cin >> bar; cout << bar;
Add semicolon.
C++
if (count = 53) {}
if (count == 53) {}
Use ==.
Dart
if foo = 68
if foo == 68
Use ==.
MATLAB
let val = 28; let val = 88;
let val = 28; val = 88;
Duplicate declaration.
JavaScript
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
[2, 81, 2
[2, 81, 2]
Close bracket.
Python
int val = 'info';
String val = 'info';
Type mismatch.
Dart
function render(val:string){{return val;}} render(62);
function render(val:string){{return val;}} render('message');
Pass correct type.
TypeScript
if (x = 99) {{}}
if (x == 99) {{}}
Use ==.
Kotlin
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(66);
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(66);
Correct.
Node.js
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
function handle() {{ return {{key:'value'}} }}
function handle() {{ return {{key:'value'}}; }}
Return object on same line.
JavaScript
if [ $foo = 73 ]; then
if [ "$foo" = 73 ]; then
Quote variable.
Shell
var bar int = 'hello'
var bar string = 'hello'
Type mismatch.
Go
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
<user><name>message</name><desc>73</desc></user
<user><name>message</name><desc>73</desc></user>
Add closing >.
XML
while read line; do echo $line; done < config.json
while read line; do echo $line; done < config.json
Correct.
Shell
// comment
/* comment */
Use /* */.
CSS
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
<input type='text' value='world'>
<input type='text' value='world' name='status'>
Add name attribute.
HTML
with open('input.csv') as fh: data = fh.read()
with open('input.csv') as fh: data = fh.read()
Correct.
Python
for (int i=0; i<41; i++) {{}}
for (int i=0; i<41; i++) {{}}
Correct.
Java
match a {{ 1 => {{}} }}
match a {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
let s1 = String::from("value"); let s2 = s1; println!("{{}}", s1);
let s1 = String::from("value"); let s2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
val = 61
val=61
No spaces.
Shell
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
val b: Int = 'result'
val b: String = 'result'
Fix type.
Kotlin
fmt.Println 'result'
fmt.Println('result')
Missing parentheses.
Go
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
'message' + 73
'message' + 73.to_s
Convert int.
Ruby
print('test')
print('test')
Correct.
R
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
class User {{ int c; }} obj.c=5;
class User {{ public int c; }} obj.c=5;
Make field public.
Java
'12' + 40
12 + 40
Avoid string coercion.
JavaScript
<p>message <b>data</p></b>
<p>message <b>data</b></p>
Nest properly.
HTML
[x*x for x in items if x > 30]
[x*x for x in items if x > 30]
Correct list comprehension.
Python
class Order {{ int z; }};
class Order {{ public: int z; }};
Make public.
C++
SELECT * FROM items WHRE name=21;
SELECT * FROM items WHERE name=21;
Fix WHERE.
SQL
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
class = 'result'
class_name = 'result'
'class' is a keyword.
Python
List(56,88,59)
List(56,88,59)
Correct.
Scala
fmt.Println 'output'
fmt.Println('output')
Missing parentheses.
Go
if ($num = 26)
if ($num == 26)
Use ==.
Perl
if (z = 65) {{}}
if (z === 65) {{}}
Use === for equality.
JavaScript
val data = 'data'
val data = "data"
Double quotes.
Kotlin
if data > 36 puts 'output'
if data > 36 puts 'output' end
Add 'end'.
Ruby
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
let val: i32 = "world";
let val: &str = "world";
Type mismatch.
Rust
let mut temp=44; let ref1=&mut temp; let ref2=&mut temp;
let mut temp=44; {{ let ref1=&mut temp; }} let ref2=&mut temp;
Only one mutable borrow.
Rust
try {{ throw 'value'; }} catch(e) {{}}
try {{ throw new Error('value'); }} catch(e) {{}}
Throw Error objects.
JavaScript
if num = 41 {{}}
if num == 41 {{}}
Use ==.
Swift
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
WHERE email = '71'
WHERE email = 71
Don't quote integer.
SQL
var temp int = 'test'
var temp string = 'test'
Type mismatch.
Go
if z = 56
if z == 56
Use ==.
Go
[56, 27, 5
[56, 27, 5]
Close bracket.
Python
[49, 57, 67
[49, 57, 67]
Close bracket.
Ruby
String z = 'result';
String z = "result";
Double quotes.
Java
id: test title: hello,
id: test title: hello
Remove comma.
YAML
.User {{ color: #333; }}
.User {{ color: #333; }}
Correct.
CSS
["world", 51]
["world", 51]
Correct.
JSON
<center>world</center>
<div style='text-align:center;'>world</div>
Use CSS.
HTML
let c = 12; let c = 22;
let c = 12; c = 22;
Duplicate declaration.
JavaScript
x := 13
x := 13
Correct.
Go
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
<?php // code ?>
<?php // code ?>
Correct.
PHP
if y = 43 then print('world') end
if y == 43 then print('world') end
Use ==.
Lua
let index = 'message'
let index = "message"
Double quotes.
Swift
SELECT * FROM orders WHRE status=14;
SELECT * FROM orders WHERE status=14;
Fix WHERE.
SQL
<person age=16>
<person age="16">
Quote attribute.
XML
if (val = 13) {{}}
if (val == 13) {{}}
Use ==.
Kotlin
with open('log.txt') as fp: data = fp.read()
with open('log.txt') as fp: data = fp.read()
Correct.
Python
{{'id':'value'}}
{{"id":"value"}}
Use double quotes.
JSON
foo == '34'
foo === 34
Use strict equality.
JavaScript
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
console.log('test'
console.log('test')
Close parenthesis.
JavaScript
assert num > 47
assert num > 47
Correct.
Python
const z = 45; z = 56;
let z = 45; z = 56;
Cannot reassign const.
JavaScript
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
for (int i=0; i<59; i++) {{}}
for (int i=0; i<59; i++) {{}}
Correct.
Java
{{'value':39, 'age' 42}}
{{'value':39, 'age':42}}
Colon missing.
Python
$data[48]
if ($data.Count -gt 48) {{ $data[48] }}
Check bounds.
PowerShell
'output' + 22
'output' + str(22)
Can't add int to string.
Python
if ($val = 44) {{}}
if ($val -eq 44) {{}}
Use -eq.
PowerShell
Write-Host 'data'
Write-Host 'data'
Correct.
PowerShell
DELETE FROM users WHERE age=47
DELETE FROM users WHERE age=47;
Add semicolon.
SQL
if (foo = 6) {{}}
if (foo == 6) {{}}
Use ==.
Java
int* obj = nullptr; *obj=5;
int* obj = new int; *obj=5;
Allocate memory.
C++
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
let val: Int = 'hello'
let val: String = 'hello'
Fix type.
Swift
if (num) console.log('yes') else console.log('no')
if (num) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
var x int
var x int
Correct.
Go
handle
handle()
Add parentheses.
Kotlin
int data[34]; data[34]=5;
int data[34]; if(34<34){{}} else data[34]=5;
Bounds check.
C++
String name = 'info';
String name = 'info';
Correct.
Dart
val z = 26; z = 41
var z = 26; z = 41
Use var for reassignment.
Scala