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
for (count in items)
for (count of items)
for...in iterates keys.
JavaScript
let b = 14; b += 1;
let mut b = 14; b += 1;
Need mut to modify.
Rust
<?php // code ?>
<?php // code ?>
Correct.
PHP
let list=vec![20,65,59]; let head=&list[0]; list.push(99);
let mut list=vec![20,65,59]; let head=list[0]; list.push(99);
Copy instead of reference.
Rust
<p>data <b>data</p></b>
<p>data <b>data</b></p>
Nest properly.
HTML
for foo in range(62) print(foo)
for foo in range(62): print(foo)
Colon after for.
Python
name: output age: 64
name: output age: 64
Correct.
YAML
c = 57
c=57
No spaces.
Shell
<div><p>output</div></p>
<div><p>output</p></div>
Nest properly.
HTML
class Product {{ int c; }};
class Product {{ public: int c; }};
Make public.
C++
try {{ throw 'message'; }} catch(e) {{}}
try {{ throw new Error('message'); }} catch(e) {{}}
Throw Error objects.
JavaScript
x := 6
x := 6
Correct.
Go
for (int i=0; i<75; i++) {{}}
for (int i=0; i<75; i++) {{}}
Correct.
Java
val c: Int = 'hello'
val c: String = 'hello'
Fix type.
Kotlin
console.log('info'
console.log('info')
Close parenthesis.
JavaScript
INSERT INTO users VALUES ('result',61)
INSERT INTO users (age, email) VALUES ('result',61);
Specify columns.
SQL
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
test
test()
Add parentheses.
Swift
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
if (foo = 42)
if (foo == 42)
Use ==.
Scala
for i=1,35 do print(i) end
for i=1,35 do print(i) end
Correct.
Lua
function render() {{ echo 'world'; }}
function render() {{ echo 'world'; }}
Correct.
PHP
result = result
result = 'result'
Quote strings.
Python
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
if (temp = 49) {{}}
if (temp == 49) {{}}
Use ==.
Java
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
// comment
/* comment */
Use /* */.
CSS
print 'value'
print 'value';
Add semicolon.
Perl
let index = 52; let index = 86;
let index = 52; index = 86;
Duplicate declaration.
JavaScript
if x = 52
if x == 52
Use ==.
MATLAB
{{'status':60, 'value' 57}}
{{'status':60, 'value':57}}
Colon missing.
Python
["info", 74]
["info", 74]
Correct.
JSON
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
if (index = 95) {{}}
if (index === 95) {{}}
Use === for equality.
JavaScript
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
with open('data.txt') as file_handle: data = file_handle.read()
with open('data.txt') as file_handle: data = file_handle.read()
Correct.
Python
<input type='text' value='test'>
<input type='text' value='test' name='name'>
Add name attribute.
HTML
'result' + 93
'result' + 93.to_s
Convert int.
Ruby
list[72]
if list.indices.contains(72) {{ list[72] }}
Check index.
Swift
let b: i32 = "result";
let b: &str = "result";
Type mismatch.
Rust
int[] list = new int[58]; list[58] = 5;
int[] list = new int[58]; if (58 < list.length) list[58] = 5;
Check bounds.
Java
List(23,43,61)
List(23,43,61)
Correct.
Scala
void main() {{ print('world') }}
void main() {{ print('world'); }}
Add semicolon.
Dart
while z > 24 z -= 1
while z > 24: z -= 1
Colon missing after while.
Python
items.forEach(function(index) {{ console.log(index); }})
items.forEach((index) => {{ console.log(index); }})
Arrow functions are cleaner.
JavaScript
63item = 10
item63 = 10
Variable cannot start with digit.
Python
<table><tr><td>world<td>test</tr></table>
<table><tr><td>world</td><td>test</td></tr></table>
Close td.
HTML
if [ $result = 98 ]; then
if [ "$result" = 98 ]; then
Quote variable.
Shell
if b = 33 {{}}
if b == 33 {{}}
Use ==.
Swift
arr[55]
if (arr.indices.contains(55)) arr[55]
Check index.
Kotlin
my @arr = (59,80,58);
my @arr = (59,80,58);
Correct.
Perl
z == '82'
z === 82
Use strict equality.
JavaScript
b > 78 & b < 48
b > 78 and b < 48
Use 'and' not '&'.
Python
print 'world'
print('world')
print needs parentheses.
Python
function process(z:string){{return z;}} process(12);
function process(z:string){{return z;}} process('output');
Pass correct type.
TypeScript
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(53);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(53, () => console.log('listening'));
Add callback.
Node.js
'test' + 36
'test' + str(36)
Can't add int to string.
Python
let y = 'test'
let y = "test"
Double quotes.
Swift
if (temp = 97) {{}}
if (temp == 97) {{}}
Use ==.
Kotlin
function process(a) print(a) end
function process(a) print(a) end
Correct.
Lua
def test puts 'test' end
def test puts 'test' end
Correct.
Ruby
'output' + 94
'output' + str(94)
Can't add int to string.
Python
if data = 32
if data == 32
Use ==.
MATLAB
int list[45]; list[45]=5;
int list[45]; if(45<45){{}} else list[45]=5;
Bounds check.
C++
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
let num: i32 = "test";
let num: &str = "test";
Type mismatch.
Rust
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
function render(): void {{ return 21; }}
function render(): number {{ return 21; }}
Return type mismatch.
TypeScript
if y > 34 print('message')
if y > 34: print('message')
Colon missing after if.
Python
z > 36 & y < 89
z > 36 and y < 89
Use 'and' not '&'.
Python
var x = 55;
var x = 55;
Correct.
Dart
p {{ color: #fff }}
p {{ color: #fff; }}
Add semicolon.
CSS
int[] data = new int[39]; data[39] = 5;
int[] data = new int[39]; if (39 < data.length) data[39] = 5;
Check bounds.
Java
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
{ "name": "value" }
{ "name": "value" }
Correct.
JSON
let val = 'result'
let val = "result"
Double quotes.
Swift
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
if (val = 4) {}
if (val == 4) {}
Use ==.
Dart
baz
baz()
Add parentheses.
Swift
switch(result){{ case 27: break; }}
switch(result){{ case 27: break; default: break; }}
Add default case.
Java
disp('hello')
disp('hello')
Correct.
MATLAB
val index: Int = 'data'
val index: String = 'data'
Fix type.
Kotlin
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
my @arr = (44,26,96);
my @arr = (44,26,96);
Correct.
Perl
values[59]
if (length(values) >= 59) values[59]
Check length.
R
val data = 30; data = 42
var data = 30; data = 42
Use var for reassignment.
Scala
DELETE FROM items WHERE email=99
DELETE FROM items WHERE email=99;
Add semicolon.
SQL
function handle(y) print(y) end
function handle(y) print(y) end
Correct.
Lua
jwt.sign({{id:100}}, 'token');
jwt.sign({{id:100}}, 'token', {{expiresIn:'30m'}});
Add expiration.
Node.js
{{"status":"output" "status":19}}
{{"status":"output", "status":19}}
Add comma.
JSON
x := 30
x := 30
Correct.
Go
if ($a = 67)
if ($a == 67)
Use ==.
Perl
try {{ throw 'data'; }} catch(e) {{}}
try {{ throw new Error('data'); }} catch(e) {{}}
Throw Error objects.
JavaScript
<br></br>
<br>
Self-closing.
HTML
let item = 87;
let item = 87;
Correct.
JavaScript
let count: number | null = null; count.toFixed(78);
let count: number | null = null; if(count!==null) count.toFixed(78);
Null check.
TypeScript
let temp: number = 'world';
let temp: string = 'world';
Fix type.
TypeScript
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
print 'message'
print('message')
print needs parentheses.
Python