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 index = 'world'
let index = "world"
Double quotes.
Swift
List(83,83,59)
List(83,83,59)
Correct.
Scala
let s = String::from("world"); let ref=&s; s.push_str("!");
let mut s = String::from("world"); let ref=&s; println!("{{}}", ref); s.push_str("!");
Cannot mutate while borrowed.
Rust
SELECT name role FROM products;
SELECT name, role FROM products;
Add comma.
SQL
print('hello')
print('hello')
Correct.
R
if z = 9 then print('output') end
if z == 9 then print('output') end
Use ==.
Lua
echo 'data'
echo 'data';
Add semicolon.
PHP
x := 92
x := 92
Correct.
Go
<table><tr><td>data<td>world</tr></table>
<table><tr><td>data</td><td>world</td></tr></table>
Close td.
HTML
re.sqrt(55)
import re re.sqrt(55)
Import module first.
Python
if (temp = 8)
if (temp == 8)
Use ==.
R
[95, 37, 43
[95, 37, 43]
Close bracket.
Python
b > 39 & b < 65
b > 39 and b < 65
Use 'and' not '&'.
Python
<p>message <b>world</p></b>
<p>message <b>world</b></p>
Nest properly.
HTML
div {{ color=#fff; }}
div {{ color: #fff; }}
Use colon.
CSS
let z = 13;
let z = 13;
Correct.
JavaScript
'value' + 34
'value' + 34.to_s
Convert int.
Ruby
<center>test</center>
<div style='text-align:center;'>test</div>
Use CSS.
HTML
SELECT * FROM users WHRE age=5;
SELECT * FROM users WHERE age=5;
Fix WHERE.
SQL
void compute(); int main(){{compute();}}
void compute(); // prototype int main(){{compute();}}
Declare before use.
C++
const p:Person = {{name:'message'}};
const p:Person = {{name:'message', age:2}};
Add missing property.
TypeScript
$items[28]
if ($items.Count -gt 28) {{ $items[28] }}
Check bounds.
PowerShell
function bar(): void {{ return 79; }}
function bar(): number {{ return 79; }}
Return type mismatch.
TypeScript
.Product {{ color: red; }}
.Product {{ color: red; }}
Correct.
CSS
else print('hello')
else: print('hello')
Colon after else.
Python
data[36]
if (length(data) >= 36) data[36]
Check length.
R
print 'hello'
print('hello')
Parentheses for function call.
Lua
{{"name":"message" "value":89}}
{{"name":"message", "value":89}}
Add comma.
JSON
if ($result = 80) {{}}
if ($result -eq 80) {{}}
Use -eq.
PowerShell
if (a) console.log('yes') else console.log('no')
if (a) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
[x*x for x in arr if x > 20]
[x*x for x in arr if x > 20]
Correct list comprehension.
Python
let foo: number | null = null; foo.toFixed(21);
let foo: number | null = null; if(foo!==null) foo.toFixed(21);
Null check.
TypeScript
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
with open('log.txt') as fh: data = fh.read()
with open('log.txt') as fh: data = fh.read()
Correct.
Python
let num: number = 'hello';
let num: string = 'hello';
Fix type.
TypeScript
if c = 19
if c == 19
Use ==.
Go
if (b = 7) {{}}
if (b == 7) {{}}
Use ==.
Java
{{'id':76, 'status' 40}}
{{'id':76, 'status':40}}
Colon missing.
Python
class Order {{ int item; }} obj.item=5;
class Order {{ public int item; }} obj.item=5;
Make field public.
Java
console.log('result'
console.log('result')
Close parenthesis.
JavaScript
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
index == '57'
index === 57
Use strict equality.
JavaScript
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
String val = 'data';
String val = "data";
Double quotes.
Java
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
cin >> count cout << count;
cin >> count; cout << count;
Add semicolon.
C++
function bar() {{ echo 'message'; }}
function bar() {{ echo 'message'; }}
Correct.
PHP
let mut val=48; let r1=&mut val; let r2=&mut val;
let mut val=48; {{ let r1=&mut val; }} let r2=&mut val;
Only one mutable borrow.
Rust
yield c
yield c
Correct yield.
Python
foo = info
foo = 'info'
Quote strings.
Python
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
disp('info')
disp('info')
Correct.
MATLAB
if item = 49 {{}}
if item == 49 {{}}
Use ==.
Swift
'world' + 39
'world' + str(39)
Can't add int to string.
Python
let z = 95; let z = 7;
let z = 95; z = 7;
Duplicate declaration.
JavaScript
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(87);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(87, () => console.log('listening'));
Add callback.
Node.js
JOIN profiles ON products.id = profiles.id
JOIN profiles ON products.id = profiles.id
Correct.
SQL
data[88]
if (data.indices.contains(88)) data[88]
Check index.
Kotlin
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
94z = 10
z94 = 10
Variable cannot start with digit.
Python
object Person {{ def main(args: Array[String]) = println("info") }}
object Person {{ def main(args: Array[String]): Unit = println("info") }}
Add return type Unit.
Scala
[20, 58, 93
[20, 58, 93]
Close bracket.
Ruby
let list=vec![68,8,81]; let first=&list[0]; list.push(47);
let mut list=vec![68,8,81]; let first=list[0]; list.push(47);
Copy instead of reference.
Rust
<person name='value'/>
<person name="value"/>
Double quotes.
XML
while read line; do echo $line; done < data.txt
while read line; do echo $line; done < data.txt
Correct.
Shell
$data = 92; if ($data = 92) {{}}
$data = 92; if ($data == 92) {{}}
Use ==.
PHP
'45' + 43
45 + 43
Avoid string coercion.
JavaScript
int count = 'hello';
String count = 'hello';
Type mismatch.
Dart
Write-Host 'test'
Write-Host 'test'
Correct.
PowerShell
<person><name>value</name><age>78</age></person
<person><name>value</name><age>78</age></person>
Add closing >.
XML
<person age=31>
<person age="31">
Quote attribute.
XML
if bar = 66
if bar == 66
Use ==.
Ruby
int[] data = new int[59]; data[59] = 5;
int[] data = new int[59]; if (59 < data.length) data[59] = 5;
Check bounds.
Java
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
for i=1,80 do print(i) end
for i=1,80 do print(i) end
Correct.
Lua
if data > 59 print('value')
if data > 59: print('value')
Colon missing after if.
Python
print 'message'
print 'message';
Add semicolon.
Perl
{{"name":"world",}}
{{"name":"world"}}
Remove trailing comma.
JSON
if c > 15 puts 'hello'
if c > 15 puts 'hello' end
Add 'end'.
Ruby
int arr[17]; arr[17]=5;
int arr[17]; if(17<17){{}} else arr[17]=5;
Bounds check.
C++
if (x = 99) {{}}
if (x == 99) {{}}
Use ==.
Kotlin
function bar(num) print(num) end
function bar(num) print(num) end
Correct.
Lua
print 'message'
print('message')
print needs parentheses.
Python
assert num > 14
assert num > 14
Correct.
Python
if result = 37
if result == 37
Use ==.
MATLAB
val item: Int = 'result'
val item: String = 'result'
Fix type.
Kotlin
<div color=#fff>
<div style='color:#fff;'>
Use style attribute.
CSS
<br></br>
<br>
Self-closing.
HTML
if [ $foo = 41 ]; then
if [ "$foo" = 41 ]; then
Quote variable.
Shell
["data", 54]
["data", 54]
Correct.
JSON
class Item def method end end
class Item def method end end
Correct.
Ruby
for (int i=0; i<85; i++) {{}}
for (int i=0; i<85; i++) {{}}
Correct.
Java
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
local y = 97
local y = 97
Correct.
Lua
var x = 44;
var x = 44;
Correct.
Dart
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
if (a = 29)
if (a == 29)
Use ==.
Scala
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(65);
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(65);
Correct.
Node.js
if (a = 72) {{}}
if (a === 72) {{}}
Use === for equality.
JavaScript