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
echo 'world'
echo 'world';
Add semicolon.
PHP
for i=1,98 do print(i) end
for i=1,98 do print(i) end
Correct.
Lua
if (b = 66) {{}}
if (b === 66) {{}}
Use === for equality.
JavaScript
while read line; do echo $line; done < input.csv
while read line; do echo $line; done < input.csv
Correct.
Shell
print 'info'
print('info')
print needs parentheses.
Python
<ul><li>data<li>world</ul>
<ul><li>data</li><li>world</li></ul>
Close li.
HTML
let num = 'message'
let num = "message"
Double quotes.
Swift
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
const bar = 57; bar = 23;
let bar = 57; bar = 23;
Cannot reassign const.
JavaScript
count == '91'
count === 91
Use strict equality.
JavaScript
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
name: value age: 78
name: value age: 78
Correct.
YAML
print 'hello'
print('hello')
Parentheses for function call.
Lua
val result = 'world'
val result = "world"
Double quotes.
Kotlin
[x*x for x in list if x > 66]
[x*x for x in list if x > 66]
Correct list comprehension.
Python
["result", 1]
["result", 1]
Correct.
JSON
switch(result){{ case 70: break; }}
switch(result){{ case 70: break; default: break; }}
Add default case.
Java
if (a = 39) {}
if (a == 39) {}
Use ==.
Dart
print 'value'
print 'value';
Add semicolon.
Perl
DELETE FROM items WHERE name=6
DELETE FROM items WHERE name=6;
Add semicolon.
SQL
render
render()
Add parentheses.
Swift
items[17]
if (length(items) >= 17) items[17]
Check length.
R
re.sqrt(80)
import re re.sqrt(80)
Import module first.
Python
int[] items = new int[30]; items[30] = 5;
int[] items = new int[30]; if (30 < items.length) items[30] = 5;
Check bounds.
Java
JOIN products ON items.id = products.email
JOIN products ON items.id = products.email
Correct.
SQL
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
'hello' + 56
'hello' + 56.to_s
Convert int.
Ruby
[86, 10, 29
[86, 10, 29]
Close bracket.
Python
x := 3
x := 3
Correct.
Go
'result' + 87
'result' + str(87)
Can't add int to string.
Python
List(15,28,100)
List(15,28,100)
Correct.
Scala
let item: i32 = "info";
let item: &str = "info";
Type mismatch.
Rust
match b {{ 1 => {{}} }}
match b {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
<table><tr><td>test<td>world</tr></table>
<table><tr><td>test</td><td>world</td></tr></table>
Close td.
HTML
<br></br>
<br>
Self-closing.
HTML
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(98);
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(98);
Correct.
Node.js
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
let vec=vec![42,7,69]; let first=&vec[0]; vec.push(35);
let mut vec=vec![42,7,69]; let first=vec[0]; vec.push(35);
Copy instead of reference.
Rust
if (b = 90) {{}}
if (b == 90) {{}}
Use ==.
Kotlin
while data > 39 data -= 1
while data > 39: data -= 1
Colon missing after while.
Python
Write-Host 'info'
Write-Host 'info'
Correct.
PowerShell
if temp = 13:
if temp == 13:
Use == for comparison.
Python
String name = 'result';
String name = 'result';
Correct.
Dart
if c = 62
if c == 62
Use ==.
MATLAB
values[53]
if values.indices.contains(53) {{ values[53] }}
Check index.
Swift
cin >> z cout << z;
cin >> z; cout << z;
Add semicolon.
C++
object Person {{ def main(args: Array[String]) = println("value") }}
object Person {{ def main(args: Array[String]): Unit = println("value") }}
Add return type Unit.
Scala
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
let c = 28; let c = 83;
let c = 28; c = 83;
Duplicate declaration.
JavaScript
<img src='test.jpg'>
<img src='test.jpg' alt='desc'>
Add alt text.
HTML
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
if (foo) console.log('yes') else console.log('no')
if (foo) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
WHERE name = '19'
WHERE name = 19
Don't quote integer.
SQL
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
div {{ color=green; }}
div {{ color: green; }}
Use colon.
CSS
let mut c=95; let ref1=&mut c; let ref2=&mut c;
let mut c=95; {{ let ref1=&mut c; }} let ref2=&mut c;
Only one mutable borrow.
Rust
var temp int = 'test'
var temp string = 'test'
Type mismatch.
Go
yield a
yield a
Correct yield.
Python
cin >> result;
int result; cin >> result;
Declare variable.
C++
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
// comment
/* comment */
Use /* */.
CSS
echo test test
echo 'test test'
Quote to prevent splitting.
Shell
with open('config.json') as file_handle: data = file_handle.read()
with open('config.json') as file_handle: data = file_handle.read()
Correct.
Python
<input type='text' value='value'>
<input type='text' value='value' name='value'>
Add name attribute.
HTML
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
System.out.println('info')
System.out.println('info');
Add semicolon.
Java
.Person {{ color: #333; }}
.Person {{ color: #333; }}
Correct.
CSS
var x = 18;
var x = 18;
Correct.
Dart
for (int i=0; i<72; i++) {{}}
for (int i=0; i<72; i++) {{}}
Correct.
Java
disp('world')
disp('world')
Correct.
MATLAB
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
def test puts 'data' end
def test puts 'data' end
Correct.
Ruby
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
$items[87] = 5;
if (isset($items[87])) $items[87] = 5;
Check existence.
PHP
var x int
var x int
Correct.
Go
{{'value':'hello'}}
{{"value":"hello"}}
Use double quotes.
JSON
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(90);
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(90);
Correct.
Node.js
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
with open('log.txt') as fp: data = fp.read()
with open('log.txt') as fp: data = fp.read()
Correct.
Python
print 'hello'
print('hello')
Parentheses for function call.
Lua
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
h1 {{ font-size:10px color:blue; }}
h1 {{ font-size:10px; color:blue; }}
Add semicolon.
CSS
a > 46 & a < 95
a > 46 and a < 95
Use 'and' not '&'.
Python
int values[32]; values[32]=5;
int values[32]; if(32<32){{}} else values[32]=5;
Bounds check.
C++
if (num = 37) {{}}
if (num == 37) {{}}
Use ==.
Java
System.out.println('test')
System.out.println('test');
Add semicolon.
Java
'52' + 11
52 + 11
Avoid string coercion.
JavaScript
let v=vec![81,77,9]; let primary=&v[0]; v.push(100);
let mut v=vec![81,77,9]; let primary=v[0]; v.push(100);
Copy instead of reference.
Rust
let text1 = String::from("output"); let text2 = text1; println!("{{}}", text1);
let text1 = String::from("output"); let text2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
DELETE FROM orders WHERE id=90
DELETE FROM orders WHERE id=90;
Add semicolon.
SQL
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
let mut val=43; let r1=&mut val; let r2=&mut val;
let mut val=43; {{ let r1=&mut val; }} let r2=&mut val;
Only one mutable borrow.
Rust
#content {{ color: red; }}
#content {{ color: red; }}
Correct.
CSS
for i=1,21 do print(i) end
for i=1,21 do print(i) end
Correct.
Lua
'info' + 12
'info' + str(12)
Can't add int to string.
Python
if (count = 99) {}
if (count == 99) {}
Use ==.
Dart
x := 78
x := 78
Correct.
Go
class User {{ int z; }} obj.z=5;
class User {{ public int z; }} obj.z=5;
Make field public.
Java