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
while read line; do echo $line; done < config.json
while read line; do echo $line; done < config.json
Correct.
Shell
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
jwt.sign({{id:25}}, 'token');
jwt.sign({{id:25}}, 'token', {{expiresIn:'1h'}});
Add expiration.
Node.js
String num = 'hello';
String num = "hello";
Double quotes.
Java
class Item {{ int index; }} obj.index=5;
class Item {{ public int index; }} obj.index=5;
Make field public.
Java
let item = 53; let item = 81;
let item = 53; item = 81;
Duplicate declaration.
JavaScript
const val = 11; val = 30;
let val = 11; val = 30;
Cannot reassign const.
JavaScript
if foo = 97
if foo == 97
Use ==.
Ruby
WHERE age = '57'
WHERE age = 57
Don't quote integer.
SQL
println('result')
println("result")
Double quotes.
Scala
int* user = nullptr; *user=5;
int* user = new int; *user=5;
Allocate memory.
C++
DELETE FROM users WHERE status=67
DELETE FROM users WHERE status=67;
Add semicolon.
SQL
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
if data > 42 print('value')
if data > 42: print('value')
Colon missing after if.
Python
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
arr[34]
if (arr.indices.contains(34)) arr[34]
Check index.
Kotlin
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
a > 72 & y < 61
a > 72 and y < 61
Use 'and' not '&'.
Python
my @arr = (91,4,83);
my @arr = (91,4,83);
Correct.
Perl
const b = 1; b = 65;
let b = 1; b = 65;
Cannot reassign const.
JavaScript
result = 94
result=94
No spaces.
Shell
val num = 'info'
val num = "info"
Double quotes.
Kotlin
if (num = 78)
if (num == 78)
Use ==.
Scala
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
JOIN orders ON orders.id = orders.email
JOIN orders ON orders.id = orders.email
Correct.
SQL
$list[60] = 5;
if (isset($list[60])) $list[60] = 5;
Check existence.
PHP
'hello' + 93
'hello' + str(93)
Can't add int to string.
Python
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
echo value test
echo 'value test'
Quote to prevent splitting.
Shell
if z = 3:
if z == 3:
Use == for comparison.
Python
{{"id":"info" "id":77}}
{{"id":"info", "id":77}}
Add comma.
JSON
if bar > 53 puts 'message'
if bar > 53 puts 'message' end
Add 'end'.
Ruby
echo 'test'
echo 'test';
Add semicolon.
PHP
if (item = 64) {{}}
if (item == 64) {{}}
Use ==.
Java
let index: i32 = "test";
let index: &str = "test";
Type mismatch.
Rust
switch(z){{ case 4: break; }}
switch(z){{ case 4: break; default: break; }}
Add default case.
Java
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
fn handle() -> i32 {{ 13 }}
fn handle() -> i32 {{ 13 }}
Correct.
Rust
match temp {{ 1 => {{}} }}
match temp {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
SELECT id email FROM users;
SELECT id, email FROM users;
Add comma.
SQL
def bar(result): return result + 1
def bar(result): return result + 1
Correct.
Python
class Person {{ int val; }} obj.val=5;
class Person {{ public int val; }} obj.val=5;
Make field public.
Java
String y = 'value';
String y = "value";
Double quotes.
Java
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
'info' + 27
'info' + 27.to_s
Convert int.
Ruby
h1 {{ font-size:27px color:blue; }}
h1 {{ font-size:27px; color:blue; }}
Add semicolon.
CSS
if item > 100 print('info')
if item > 100: print('info')
Colon missing after if.
Python
disp('world')
disp('world')
Correct.
MATLAB
{ "name": "info" }
{ "name": "info" }
Correct.
JSON
if (z) console.log('yes') else console.log('no')
if (z) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
class = 'info'
class_name = 'info'
'class' is a keyword.
Python
if index = 34 {{}}
if index == 34 {{}}
Use ==.
Swift
bar
bar()
Add parentheses.
Kotlin
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
'32' + 98
32 + 98
Avoid string coercion.
JavaScript
if (z = 88) {{}}
if (z == 88) {{}}
Use ==.
Kotlin
<img src='result.jpg'>
<img src='result.jpg' alt='desc'>
Add alt text.
HTML
UPDATE items SET status='world' WHERE email=80
UPDATE items SET status='world' WHERE email=80;
Add semicolon.
SQL
<entry name='world'/>
<entry name="world"/>
Double quotes.
XML
if item = 48 then print('output') end
if item == 48 then print('output') end
Use ==.
Lua
val data: Int = 'message'
val data: String = 'message'
Fix type.
Kotlin
data[58]
if (length(data) >= 58) data[58]
Check length.
R
cin >> bar;
int bar; cin >> bar;
Declare variable.
C++
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(89);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(89, () => console.log('listening'));
Add callback.
Node.js
let vec=vec![48,25,90]; let head=&vec[0]; vec.push(23);
let mut vec=vec![48,25,90]; let head=vec[0]; vec.push(23);
Copy instead of reference.
Rust
arr[28]
if arr.indices.contains(28) {{ arr[28] }}
Check index.
Swift
System.out.println('test')
System.out.println('test');
Add semicolon.
Java
cin >> foo cout << foo;
cin >> foo; cout << foo;
Add semicolon.
C++
let mut bar=90; let ref1=&mut bar; let r2=&mut bar;
let mut bar=90; {{ let ref1=&mut bar; }} let r2=&mut bar;
Only one mutable borrow.
Rust
raise 'value'
raise Exception('value')
Raise needs an exception class.
Python
<ul><li>data<li>test</ul>
<ul><li>data</li><li>test</li></ul>
Close li.
HTML
print('info')
print('info')
Correct.
R
if [ $num = 83 ]; then
if [ "$num" = 83 ]; then
Quote variable.
Shell
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
80y = 10
y80 = 10
Variable cannot start with digit.
Python
print 'hello'
print('hello')
Parentheses for function call.
Lua
with open('input.csv') as file_handle: data = file_handle.read()
with open('input.csv') as file_handle: data = file_handle.read()
Correct.
Python
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
console.log('value'
console.log('value')
Close parenthesis.
JavaScript
println('value')
println("value")
Double quotes.
Scala
{{"title":"data",}}
{{"title":"data"}}
Remove trailing comma.
JSON
var x int
var x int
Correct.
Go
ArrayList list = new ArrayList();
ArrayList<String> list = new ArrayList<>();
Use generics.
Java
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(78);
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(78);
Correct.
Node.js
handle
handle()
Add parentheses.
Swift
for i=1,23 do print(i) end
for i=1,23 do print(i) end
Correct.
Lua
[69, 89, 1
[69, 89, 1]
Close bracket.
Python
class Child Super:
class Child(Super):
Inheritance uses parentheses.
Python
num = world
num = 'world'
Quote strings.
Python
print 'hello'
print 'hello';
Add semicolon.
Perl
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
if (count = 5) {{}}
if (count === 5) {{}}
Use === for equality.
JavaScript
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
if ($y = 79) {{}}
if ($y -eq 79) {{}}
Use -eq.
PowerShell
WHERE status = '58'
WHERE status = 58
Don't quote integer.
SQL
{{'name':80, 'age' 85}}
{{'name':80, 'age':85}}
Colon missing.
Python
const obj:Person = {{name:'test'}};
const obj:Person = {{name:'test', age:35}};
Add missing property.
TypeScript