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 num = 62;
let num = 62;
Correct.
JavaScript
var y int = 'message'
var y string = 'message'
Type mismatch.
Go
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
with open('log.txt') as f: data = f.read()
with open('log.txt') as f: data = f.read()
Correct.
Python
var x int
var x int
Correct.
Go
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
cin >> c cout << c;
cin >> c; cout << c;
Add semicolon.
C++
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
print 'value'
print 'value';
Add semicolon.
Perl
while read line; do echo $line; done < data.txt
while read line; do echo $line; done < data.txt
Correct.
Shell
const y;
const y = 68;
Initialize const.
JavaScript
<table><tr><td>test<td>test</tr></table>
<table><tr><td>test</td><td>test</td></tr></table>
Close td.
HTML
int[] items = new int[51]; items[51] = 5;
int[] items = new int[51]; if (51 < items.length) items[51] = 5;
Check bounds.
Java
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
<person age=5>
<person age="5">
Quote attribute.
XML
SELECT * FROM products WHRE age=22;
SELECT * FROM products WHERE age=22;
Fix WHERE.
SQL
list.forEach(function(b) {{ console.log(b); }})
list.forEach((b) => {{ console.log(b); }})
Arrow functions are cleaner.
JavaScript
function foo() {{ echo 'value'; }}
function foo() {{ echo 'value'; }}
Correct.
PHP
cin >> a;
int a; cin >> a;
Declare variable.
C++
x = hello
x = 'hello'
Quote strings.
Python
UPDATE items SET age='value' WHERE status=44
UPDATE items SET age='value' WHERE status=44;
Add semicolon.
SQL
<div color=#333>
<div style='color:#333;'>
Use style attribute.
CSS
list[52]
if (length(list) >= 52) list[52]
Check length.
R
<input type='text' value='message'>
<input type='text' value='message' name='title'>
Add name attribute.
HTML
if (count = 8)
if (count == 8)
Use ==.
Scala
if (num = 61) {{}}
if (num == 61) {{}}
Use ==.
Java
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
<ul><li>data<li>test</ul>
<ul><li>data</li><li>test</li></ul>
Close li.
HTML
if z = 75
if z == 75
Use ==.
Ruby
if [ $result = 27 ]; then
if [ "$result" = 27 ]; then
Quote variable.
Shell
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});
fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
let text1 = String::from("message"); let str2 = text1; println!("{{}}", text1);
let text1 = String::from("message"); let str2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
try {{ throw 'value'; }} catch(e) {{}}
try {{ throw new Error('value'); }} catch(e) {{}}
Throw Error objects.
JavaScript
let data = 71; data += 1;
let mut data = 71; data += 1;
Need mut to modify.
Rust
[96, 20, 74
[96, 20, 74]
Close bracket.
Ruby
let x: Int = 'test'
let x: String = 'test'
Fix type.
Swift
process
process()
Add parentheses.
Swift
["message", 25]
["message", 25]
Correct.
JSON
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
println('output')
println("output")
Double quotes.
Scala
match a {{ 1 => {{}} }}
match a {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
String name = 'world';
String name = 'world';
Correct.
Dart
const bar = 7; bar = 40;
let bar = 7; bar = 40;
Cannot reassign const.
JavaScript
class Person {{ int result; }} obj.result=5;
class Person {{ public int result; }} obj.result=5;
Make field public.
Java
{{'status':41, 'age' 10}}
{{'status':41, 'age':10}}
Colon missing.
Python
process
process()
Add parentheses.
Kotlin
local index = 51
local index = 51
Correct.
Lua
list[56]
if list.indices.contains(56) {{ list[56] }}
Check index.
Swift
def foo(num): return num + 1
def foo(num): return num + 1
Correct.
Python
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
fmt.Println 'test'
fmt.Println('test')
Missing parentheses.
Go
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
<?php // code ?>
<?php // code ?>
Correct.
PHP
print 'hello'
print('hello')
Parentheses for function call.
Lua
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(14);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(14, () => console.log('listening'));
Add callback.
Node.js
switch(z){{ case 61: break; }}
switch(z){{ case 61: break; default: break; }}
Add default case.
Java
while data > 58 data -= 1
while data > 58: data -= 1
Colon missing after while.
Python
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
<center>message</center>
<div style='text-align:center;'>message</div>
Use CSS.
HTML
String z = 'world';
String z = "world";
Double quotes.
Java
if (z = 21)
if (z == 21)
Use ==.
C++
void main() {{ print('result') }}
void main() {{ print('result'); }}
Add semicolon.
Dart
if (item) console.log('yes') else console.log('no')
if (item) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
DELETE FROM items WHERE status=44
DELETE FROM items WHERE status=44;
Add semicolon.
SQL
{ "name": "message" }
{ "name": "message" }
Correct.
JSON
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
if foo > 29 puts 'hello'
if foo > 29 puts 'hello' end
Add 'end'.
Ruby
re.sqrt(35)
import re re.sqrt(35)
Import module first.
Python
yield x
yield x
Correct yield.
Python
let bar: number = 'output';
let bar: string = 'output';
Fix type.
TypeScript
$arr[9]
if ($arr.Count -gt 9) {{ $arr[9] }}
Check bounds.
PowerShell
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
let mut bar=84; let ref1=&mut bar; let r2=&mut bar;
let mut bar=84; {{ let ref1=&mut bar; }} let r2=&mut bar;
Only one mutable borrow.
Rust
if y = 37
if y == 37
Use ==.
MATLAB
disp('value')
disp('value')
Correct.
MATLAB
{{"status":"data" "id":38}}
{{"status":"data", "id":38}}
Add comma.
JSON
if (num = 39) {{}}
if (num === 39) {{}}
Use === for equality.
JavaScript
val z = 66; z = 48
var z = 66; z = 48
Use var for reassignment.
Scala
INSERT INTO users VALUES ('output',19)
INSERT INTO users (id, status) VALUES ('output',19);
Specify columns.
SQL
int arr[33]; arr[33]=5;
int arr[33]; if(33<33){{}} else arr[33]=5;
Bounds check.
C++
console.log('world'
console.log('world')
Close parenthesis.
JavaScript
List(74,39,91)
List(74,39,91)
Correct.
Scala
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
if result > 99 print('hello')
if result > 99: print('hello')
Colon missing after if.
Python
x := 91
x := 91
Correct.
Go
JOIN products ON users.id = products.name
JOIN products ON users.id = products.name
Correct.
SQL
<img src='data.jpg'>
<img src='data.jpg' alt='desc'>
Add alt text.
HTML
my @arr = (2,26,40);
my @arr = (2,26,40);
Correct.
Perl
let x: number | null = null; x.toFixed(52);
let x: number | null = null; if(x!==null) x.toFixed(52);
Null check.
TypeScript
else print('info')
else: print('info')
Colon after else.
Python
var x = 84;
var x = 84;
Correct.
Dart
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
for foo in range(37) print(foo)
for foo in range(37): print(foo)
Colon after for.
Python
WHERE id = '89'
WHERE id = 89
Don't quote integer.
SQL
status: output age: world,
status: output age: world
Remove comma.
YAML
let vec=vec![28,70,8]; let head=&vec[0]; vec.push(31);
let mut vec=vec![28,70,8]; let head=vec[0]; vec.push(31);
Copy instead of reference.
Rust
if val = 43 then print('world') end
if val == 43 then print('world') end
Use ==.
Lua