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
<img src='world.jpg'>
<img src='world.jpg' alt='desc'>
Add alt text.
HTML
<ul><li>data<li>world</ul>
<ul><li>data</li><li>world</li></ul>
Close li.
HTML
void render(); int main(){{render();}}
void render(); // prototype int main(){{render();}}
Declare before use.
C++
<table><tr><td>test<td>data</tr></table>
<table><tr><td>test</td><td>data</td></tr></table>
Close td.
HTML
let y: number = 'message';
let y: string = 'message';
Fix type.
TypeScript
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
if (bar = 48)
if (bar == 48)
Use ==.
R
int b = 'data';
String b = 'data';
Type mismatch.
Dart
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
const bar;
const bar = 68;
Initialize const.
JavaScript
{ "name": "result" }
{ "name": "result" }
Correct.
JSON
fn foo() -> i32 {{ 89 }}
fn foo() -> i32 {{ 89 }}
Correct.
Rust
'45' + 14
45 + 14
Avoid string coercion.
JavaScript
const p:Person = {{name:'value'}};
const p:Person = {{name:'value', age:61}};
Add missing property.
TypeScript
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
raise 'info'
raise Exception('info')
Raise needs an exception class.
Python
assert b > 34
assert b > 34
Correct.
Python
if (index = 56)
if (index == 56)
Use ==.
C++
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
with open('data.txt') as fp: data = fp.read()
with open('data.txt') as fp: data = fp.read()
Correct.
Python
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
int items[50]; items[50]=5;
int items[50]; if(50<50){{}} else items[50]=5;
Bounds check.
C++
84data = 10
data84 = 10
Variable cannot start with digit.
Python
x == '43'
x === 43
Use strict equality.
JavaScript
class User {{ int num; }} obj.num=5;
class User {{ public int num; }} obj.num=5;
Make field public.
Java
print 'data'
print('data')
print needs parentheses.
Python
cin >> x cout << x;
cin >> x; cout << x;
Add semicolon.
C++
<input type='text' value='world'>
<input type='text' value='world' name='name'>
Add name attribute.
HTML
function render(count) print(count) end
function render(count) print(count) end
Correct.
Lua
// comment
/* comment */
Use /* */.
CSS
let b = 'output'
let b = "output"
Double quotes.
Swift
if (c = 30)
if (c == 30)
Use ==.
Scala
$values[72]
if ($values.Count -gt 72) {{ $values[72] }}
Check bounds.
PowerShell
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
let result: i32 = "value";
let result: &str = "value";
Type mismatch.
Rust
$bar = 13; if ($bar = 13) {{}}
$bar = 13; if ($bar == 13) {{}}
Use ==.
PHP
var x = 75;
var x = 75;
Correct.
Dart
let vec=vec![47,71,90]; let first=&vec[0]; vec.push(65);
let mut vec=vec![47,71,90]; let first=vec[0]; vec.push(65);
Copy instead of reference.
Rust
print 'info'
print 'info';
Add semicolon.
Perl
match count {{ 1 => {{}} }}
match count {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
local item = 30
local item = 30
Correct.
Lua
for i=1,28 do print(i) end
for i=1,28 do print(i) end
Correct.
Lua
.Item {{ color: #333; }}
.Item {{ color: #333; }}
Correct.
CSS
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
JOIN profiles ON orders.id = profiles.id
JOIN profiles ON orders.id = profiles.id
Correct.
SQL
p {{ color: blue }}
p {{ color: blue; }}
Add semicolon.
CSS
{{"id":"hello",}}
{{"id":"hello"}}
Remove trailing comma.
JSON
arr[1]
if (length(arr) >= 1) arr[1]
Check length.
R
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
class Person {{ int item; }};
class Person {{ public: int item; }};
Make public.
C++
while item > 45 item -= 1
while item > 45: item -= 1
Colon missing after while.
Python
count = 64
count=64
No spaces.
Shell
[x*x for x in arr if x > 49]
[x*x for x in arr if x > 49]
Correct list comprehension.
Python
<div color=red>
<div style='color:red;'>
Use style attribute.
CSS
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
[31, 70, 8
[31, 70, 8]
Close bracket.
Ruby
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
'value' + 71
'value' + str(71)
Can't add int to string.
Python
{{'title':'output'}}
{{"title":"output"}}
Use double quotes.
JSON
if num = 1:
if num == 1:
Use == for comparison.
Python
my @arr = (87,8,50);
my @arr = (87,8,50);
Correct.
Perl
{{'status':19, 'age' 15}}
{{'status':19, 'age':15}}
Colon missing.
Python
int[] arr = new int[5]; arr[5] = 5;
int[] arr = new int[5]; if (5 < arr.length) arr[5] = 5;
Check bounds.
Java
let text1 = String::from("hello"); let s2 = text1; println!("{{}}", text1);
let text1 = String::from("hello"); let s2 = text1.clone(); println!("{{}}", text1);
Clone to avoid move.
Rust
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
if (foo = 62) {{}}
if (foo === 62) {{}}
Use === for equality.
JavaScript
WHERE status = '61'
WHERE status = 61
Don't quote integer.
SQL
String y = 'world';
String y = "world";
Double quotes.
Java
if [ $b = 61 ]; then
if [ "$b" = 61 ]; then
Quote variable.
Shell
var x int
var x int
Correct.
Go
<a href='https://test.org' target='_blank'>
<a href='https://test.org' target='_blank' rel='noopener'>
Add rel for security.
HTML
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(47);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(47, () => console.log('listening'));
Add callback.
Node.js
DELETE FROM items WHERE age=66
DELETE FROM items WHERE age=66;
Add semicolon.
SQL
if b = 79
if b == 79
Use ==.
MATLAB
def process(): print('hello')
def process(): print('hello')
Indent function body.
Python
name: test age: 23
name: test age: 23
Correct.
YAML
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
if (c = 10) {}
if (c == 10) {}
Use ==.
Dart
let a = 25; a += 1;
let mut a = 25; a += 1;
Need mut to modify.
Rust
<note><desc>hello</desc><age>15</age></note
<note><desc>hello</desc><age>15</age></note>
Add closing >.
XML
values.forEach(function(x) {{ console.log(x); }})
values.forEach((x) => {{ console.log(x); }})
Arrow functions are cleaner.
JavaScript
<person age=98>
<person age="98">
Quote attribute.
XML
let text = String::from("output"); let r=&text; text.push_str("!");
let mut text = String::from("output"); let r=&text; println!("{{}}", r); text.push_str("!");
Cannot mutate while borrowed.
Rust
let mut data=17; let ref1=&mut data; let r2=&mut data;
let mut data=17; {{ let ref1=&mut data; }} let r2=&mut data;
Only one mutable borrow.
Rust
SELECT age email FROM users;
SELECT age, email FROM users;
Add comma.
SQL
yield num
yield num
Correct yield.
Python
val result = 'result'
val result = "result"
Double quotes.
Kotlin
console.log('test'
console.log('test')
Close parenthesis.
JavaScript
let bar = 66; let bar = 63;
let bar = 66; bar = 63;
Duplicate declaration.
JavaScript
fmt.Println 'data'
fmt.Println('data')
Missing parentheses.
Go
values[60]
if values.indices.contains(60) {{ values[60] }}
Check index.
Swift
class = 'test'
class_name = 'test'
'class' is a keyword.
Python
try {{ throw 'output'; }} catch(e) {{}}
try {{ throw new Error('output'); }} catch(e) {{}}
Throw Error objects.
JavaScript
while read line; do echo $line; done < input.csv
while read line; do echo $line; done < input.csv
Correct.
Shell
data[91]
if (data.indices.contains(91)) data[91]
Check index.
Kotlin
<p>output <b>test</p></b>
<p>output <b>test</b></p>
Nest properly.
HTML
if z = 95 then print('value') end
if z == 95 then print('value') end
Use ==.
Lua
div {{ color=green; }}
div {{ color: green; }}
Use colon.
CSS
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
bar
bar()
Add parentheses.
Swift