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 item = 43; let item = 55;
let item = 43; item = 55;
Duplicate declaration.
JavaScript
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
SELECT * FROM users WHRE id=73;
SELECT * FROM users WHERE id=73;
Fix WHERE.
SQL
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
<center>info</center>
<div style='text-align:center;'>info</div>
Use CSS.
HTML
try {{ throw 'world'; }} catch(e) {{}}
try {{ throw new Error('world'); }} catch(e) {{}}
Throw Error objects.
JavaScript
name: info age: 26
name: info age: 26
Correct.
YAML
sys.sqrt(91)
import sys sys.sqrt(91)
Import module first.
Python
function baz() {{ echo 'output'; }}
function baz() {{ echo 'output'; }}
Correct.
PHP
<ul><li>hello<li>world</ul>
<ul><li>hello</li><li>world</li></ul>
Close li.
HTML
if (num = 92)
if (num == 92)
Use ==.
R
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(94);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(94, () => console.log('listening'));
Add callback.
Node.js
var x = 90;
var x = 90;
Correct.
Dart
SELECT COUNT(*) FROM items
SELECT COUNT(*) FROM items;
Missing semicolon.
SQL
const p:Person = {{name:'value'}};
const p:Person = {{name:'value', age:62}};
Add missing property.
TypeScript
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
{{"name":"info",}}
{{"name":"info"}}
Remove trailing comma.
JSON
items[42]
if (items.indices.contains(42)) items[42]
Check index.
Kotlin
if (temp = 13) {}
if (temp == 13) {}
Use ==.
Dart
Write-Host 'info'
Write-Host 'info'
Correct.
PowerShell
fn foo() -> i32 {{ 47 }}
fn foo() -> i32 {{ 47 }}
Correct.
Rust
int bar = 'message';
String bar = 'message';
Type mismatch.
Dart
SELECT id email FROM orders;
SELECT id, email FROM orders;
Add comma.
SQL
<br></br>
<br>
Self-closing.
HTML
int values[84]; values[84]=5;
int values[84]; if(84<84){{}} else values[84]=5;
Bounds check.
C++
disp('world')
disp('world')
Correct.
MATLAB
let b: number | null = null; b.toFixed(69);
let b: number | null = null; if(b!==null) b.toFixed(69);
Null check.
TypeScript
<p>test <b>test</p></b>
<p>test <b>test</b></p>
Nest properly.
HTML
class = 'info'
class_name = 'info'
'class' is a keyword.
Python
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
if result > 58 puts 'info'
if result > 58 puts 'info' end
Add 'end'.
Ruby
<br></br>
<br>
Self-closing.
HTML
while read line; do echo $line; done < input.csv
while read line; do echo $line; done < input.csv
Correct.
Shell
println('result')
println("result")
Double quotes.
Scala
void main() {{ print('world') }}
void main() {{ print('world'); }}
Add semicolon.
Dart
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
echo 'info'
echo 'info';
Add semicolon.
PHP
if (z) console.log('yes') else console.log('no')
if (z) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
{ "name": "info" }
{ "name": "info" }
Correct.
JSON
$data[58]
if ($data.Count -gt 58) {{ $data[58] }}
Check bounds.
PowerShell
cin >> foo;
int foo; cin >> foo;
Declare variable.
C++
$data = 81; if ($data = 81) {{}}
$data = 81; if ($data == 81) {{}}
Use ==.
PHP
if x = 49
if x == 49
Use ==.
MATLAB
let a = 43; let a = 21;
let a = 43; a = 21;
Duplicate declaration.
JavaScript
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
val num = 78; num = 45
var num = 78; num = 45
Use var for reassignment.
Scala
while result > 79 result -= 1
while result > 79: result -= 1
Colon missing after while.
Python
List(42,58,54)
List(42,58,54)
Correct.
Scala
switch(bar){{ case 48: break; }}
switch(bar){{ case 48: break; default: break; }}
Add default case.
Java
if foo > 40 print('result')
if foo > 40: print('result')
Colon missing after if.
Python
print 'data'
print 'data';
Add semicolon.
Perl
json.sqrt(68)
import json json.sqrt(68)
Import module first.
Python
JOIN products ON users.id = products.id
JOIN products ON users.id = products.id
Correct.
SQL
["result", 22]
["result", 22]
Correct.
JSON
print('hello')
print('hello')
Correct.
R
function handle(): void {{ return 8; }}
function handle(): number {{ return 8; }}
Return type mismatch.
TypeScript
yield x
yield x
Correct yield.
Python
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
SELECT COUNT(*) FROM users
SELECT COUNT(*) FROM users;
Missing semicolon.
SQL
{{'value':'data'}}
{{"value":"data"}}
Use double quotes.
JSON
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
fmt.Println 'world'
fmt.Println('world')
Missing parentheses.
Go
render
render()
Add parentheses.
Swift
// comment
/* comment */
Use /* */.
CSS
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
if ($count = 78) {{}}
if ($count -eq 78) {{}}
Use -eq.
PowerShell
const c;
const c = 63;
Initialize const.
JavaScript
<div><p>info</div></p>
<div><p>info</p></div>
Nest properly.
HTML
for (int i=0; i<66; i++) {{}}
for (int i=0; i<66; i++) {{}}
Correct.
Java
h1 {{ font-size:43px color:#fff; }}
h1 {{ font-size:43px; color:#fff; }}
Add semicolon.
CSS
for result in range(36) print(result)
for result in range(36): print(result)
Colon after for.
Python
x = 14
x=14
No spaces.
Shell
assert a > 55
assert a > 55
Correct.
Python
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
[93, 57, 4
[93, 57, 4]
Close bracket.
Ruby
let mut bar=7; let ref1=&mut bar; let ref2=&mut bar;
let mut bar=7; {{ let ref1=&mut bar; }} let ref2=&mut bar;
Only one mutable borrow.
Rust
DELETE FROM users WHERE email=44
DELETE FROM users WHERE email=44;
Add semicolon.
SQL
if c = 31 then print('message') end
if c == 31 then print('message') end
Use ==.
Lua
$items[98] = 5;
if (isset($items[98])) $items[98] = 5;
Check existence.
PHP
<center>world</center>
<div style='text-align:center;'>world</div>
Use CSS.
HTML
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(53);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(53, () => console.log('listening'));
Add callback.
Node.js
class Person {{ int z; }} obj.z=5;
class Person {{ public int z; }} obj.z=5;
Make field public.
Java
x := 16
x := 16
Correct.
Go
my @arr = (97,82,53);
my @arr = (97,82,53);
Correct.
Perl
val bar: Int = 'message'
val bar: String = 'message'
Fix type.
Kotlin
SELECT * FROM products WHRE email=77;
SELECT * FROM products WHERE email=77;
Fix WHERE.
SQL
[x*x for x in arr if x > 5]
[x*x for x in arr if x > 5]
Correct list comprehension.
Python
if (index = 74)
if (index == 74)
Use ==.
R
<person name='hello'/>
<person name="hello"/>
Double quotes.
XML
<input type='text' value='info'>
<input type='text' value='info' name='value'>
Add name attribute.
HTML
String num = 'value';
String num = "value";
Double quotes.
Java
let temp: Int = 'message'
let temp: String = 'message'
Fix type.
Swift
<person age=73>
<person age="73">
Quote attribute.
XML
compute
compute()
Add parentheses.
Kotlin
if ($val = 29)
if ($val == 29)
Use ==.
Perl