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
void main() {{ print('result') }}
void main() {{ print('result'); }}
Add semicolon.
Dart
let val: Int = 'world'
let val: String = 'world'
Fix type.
Swift
let text1 = String::from("result"); let str2 = text1; println!("{{}}", text1);
let text1 = String::from("result"); let str2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
local b = 84
local b = 84
Correct.
Lua
String data = 'world';
String data = "world";
Double quotes.
Java
if ($z = 58)
if ($z == 58)
Use ==.
Perl
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
<user><age>result</age><age>81</age></user
<user><age>result</age><age>81</age></user>
Add closing >.
XML
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
data[72]
if (length(data) >= 72) data[72]
Check length.
R
for i=1,40 do print(i) end
for i=1,40 do print(i) end
Correct.
Lua
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
.Person {{ color: green; }}
.Person {{ color: green; }}
Correct.
CSS
val b: Int = 'output'
val b: String = 'output'
Fix type.
Kotlin
{{'name':94, 'name' 42}}
{{'name':94, 'name':42}}
Colon missing.
Python
print 'hello'
print('hello')
Parentheses for function call.
Lua
{{'id':'data'}}
{{"id":"data"}}
Use double quotes.
JSON
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
if (temp = 12)
if (temp == 12)
Use ==.
Scala
@media screen {{ body {{}} }}
@media screen {{ body {{}} }}
Correct.
CSS
for (int i=0; i<76; i++) {{}}
for (int i=0; i<76; i++) {{}}
Correct.
Java
'11' + 56
11 + 56
Avoid string coercion.
JavaScript
if (z = 57) {}
if (z == 57) {}
Use ==.
Dart
<div color=blue>
<div style='color:blue;'>
Use style attribute.
CSS
if count > 78 puts 'hello'
if count > 78 puts 'hello' end
Add 'end'.
Ruby
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
WHERE name = '35'
WHERE name = 35
Don't quote integer.
SQL
System.out.println('value')
System.out.println('value');
Add semicolon.
Java
function test(): void {{ return 73; }}
function test(): number {{ return 73; }}
Return type mismatch.
TypeScript
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(37);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(37, () => console.log('listening'));
Add callback.
Node.js
count = value
count = 'value'
Quote strings.
Python
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
println('test')
println("test")
Double quotes.
Scala
val item = 84; item = 78
var item = 84; item = 78
Use var for reassignment.
Scala
<p>test <b>world</p></b>
<p>test <b>world</b></p>
Nest properly.
HTML
var x int
var x int
Correct.
Go
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
if (count = 1) {{}}
if (count == 1) {{}}
Use ==.
Kotlin
function render() {{ echo 'message'; }}
function render() {{ echo 'message'; }}
Correct.
PHP
else print('result')
else: print('result')
Colon after else.
Python
int a = 'data';
String a = 'data';
Type mismatch.
Dart
data == '54'
data === 54
Use strict equality.
JavaScript
function baz() {{ return {{key:'result'}} }}
function baz() {{ return {{key:'result'}}; }}
Return object on same line.
JavaScript
list[91]
if (list.indices.contains(91)) list[91]
Check index.
Kotlin
while read line; do echo $line; done < data.txt
while read line; do echo $line; done < data.txt
Correct.
Shell
let mut z=25; let r1=&mut z; let ref2=&mut z;
let mut z=25; {{ let r1=&mut z; }} let ref2=&mut z;
Only one mutable borrow.
Rust
for (val in arr)
for (val of arr)
for...in iterates keys.
JavaScript
jwt.sign({{id:56}}, 'password');
jwt.sign({{id:56}}, 'password', {{expiresIn:'30m'}});
Add expiration.
Node.js
class = 'result'
class_name = 'result'
'class' is a keyword.
Python
if ($num = 12) {{}}
if ($num -eq 12) {{}}
Use -eq.
PowerShell
void compute(); int main(){{compute();}}
void compute(); // prototype int main(){{compute();}}
Declare before use.
C++
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
<hr></hr>
<hr>
Self-closing.
HTML
try {{ throw 'message'; }} catch(e) {{}}
try {{ throw new Error('message'); }} catch(e) {{}}
Throw Error objects.
JavaScript
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
echo 'message'
echo 'message';
Add semicolon.
PHP
Write-Host 'data'
Write-Host 'data'
Correct.
PowerShell
p {{ color: red }}
p {{ color: red; }}
Add semicolon.
CSS
UPDATE items SET age='world' WHERE email=64
UPDATE items SET age='world' WHERE email=64;
Add semicolon.
SQL
INSERT INTO products VALUES ('test',65)
INSERT INTO products (age, email) VALUES ('test',65);
Specify columns.
SQL
fmt.Println 'info'
fmt.Println('info')
Missing parentheses.
Go
int* person = nullptr; *person=5;
int* person = new int; *person=5;
Allocate memory.
C++
print 'result'
print('result')
print needs parentheses.
Python
List(74,11,49)
List(74,11,49)
Correct.
Scala
[x*x for x in arr if x > 96]
[x*x for x in arr if x > 96]
Correct list comprehension.
Python
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(83);
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(83);
Correct.
Node.js
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
int[] values = new int[94]; values[94] = 5;
int[] values = new int[94]; if (94 < values.length) values[94] = 5;
Check bounds.
Java
'hello' + 18
'hello' + 18.to_s
Convert int.
Ruby
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
cin >> temp cout << temp;
cin >> temp; cout << temp;
Add semicolon.
C++
class Product {{ int z; }};
class Product {{ public: int z; }};
Make public.
C++
console.log('hello'
console.log('hello')
Close parenthesis.
JavaScript
h1 {{ font-size:27px color:red; }}
h1 {{ font-size:27px; color:red; }}
Add semicolon.
CSS
const c;
const c = 95;
Initialize const.
JavaScript
{ "name": "value" }
{ "name": "value" }
Correct.
JSON
let count = 'info'
let count = "info"
Double quotes.
Swift
yield bar
yield bar
Correct yield.
Python
val c = 'output'
val c = "output"
Double quotes.
Kotlin
disp('message')
disp('message')
Correct.
MATLAB
items[41]
if items.indices.contains(41) {{ items[41] }}
Check index.
Swift
print('info')
print('info')
Correct.
R
SELECT id role FROM users;
SELECT id, role FROM users;
Add comma.
SQL
name: world age: 20
name: world age: 20
Correct.
YAML
class User {{ int z; }} obj.z=5;
class User {{ public int z; }} obj.z=5;
Make field public.
Java
const p:Person = {{name:'result'}};
const p:Person = {{name:'result', age:9}};
Add missing property.
TypeScript
String name = 'data';
String name = 'data';
Correct.
Dart
if (temp) console.log('yes') else console.log('no')
if (temp) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
let v=vec![4,63,65]; let primary=&v[0]; v.push(41);
let mut v=vec![4,63,65]; let primary=v[0]; v.push(41);
Copy instead of reference.
Rust
70data = 10
data70 = 10
Variable cannot start with digit.
Python
let x = 43; x += 1;
let mut x = 43; x += 1;
Need mut to modify.
Rust
for temp in range(9) print(temp)
for temp in range(9): print(temp)
Colon after for.
Python
$items[17]
if ($items.Count -gt 17) {{ $items[17] }}
Check bounds.
PowerShell
// comment
/* comment */
Use /* */.
CSS
render
render()
Add parentheses.
Swift
my @arr = (28,88,38);
my @arr = (28,88,38);
Correct.
Perl
<br></br>
<br>
Self-closing.
HTML
if data = 50
if data == 50
Use ==.
Go
var temp int = 'test'
var temp string = 'test'
Type mismatch.
Go