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
<center>test</center>
<div style='text-align:center;'>test</div>
Use CSS.
HTML
z == '5'
z === 5
Use strict equality.
JavaScript
print('info')
print('info')
Correct.
R
let temp = 79; temp += 1;
let mut temp = 79; temp += 1;
Need mut to modify.
Rust
let msg = String::from("output"); let borrow=&msg; msg.push_str("!");
let mut msg = String::from("output"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!");
Cannot mutate while borrowed.
Rust
'value' + 15
'value' + str(15)
Can't add int to string.
Python
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
{{'title':17, 'title' 61}}
{{'title':17, 'title':61}}
Colon missing.
Python
if [ $y = 84 ]; then
if [ "$y" = 84 ]; then
Quote variable.
Shell
if num = 61
if num == 61
Use ==.
Go
raise 'hello'
raise Exception('hello')
Raise needs an exception class.
Python
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
print 'hello'
print('hello')
Parentheses for function call.
Lua
SELECT age email FROM orders;
SELECT age, email FROM orders;
Add comma.
SQL
[73, 54, 57
[73, 54, 57]
Close bracket.
Ruby
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
int[] data = new int[78]; data[78] = 5;
int[] data = new int[78]; if (78 < data.length) data[78] = 5;
Check bounds.
Java
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
#footer {{ color: blue; }}
#footer {{ color: blue; }}
Correct.
CSS
<person age=95>
<person age="95">
Quote attribute.
XML
cin >> num;
int num; cin >> num;
Declare variable.
C++
INSERT INTO users VALUES ('result',22)
INSERT INTO users (age, email) VALUES ('result',22);
Specify columns.
SQL
echo 'message'
echo 'message';
Add semicolon.
PHP
def handle puts 'message' end
def handle puts 'message' end
Correct.
Ruby
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
function foo(): void {{ return 8; }}
function foo(): number {{ return 8; }}
Return type mismatch.
TypeScript
let v=vec![9,89,90]; let first=&v[0]; v.push(86);
let mut v=vec![9,89,90]; let first=v[0]; v.push(86);
Copy instead of reference.
Rust
items.forEach(function(count) {{ console.log(count); }})
items.forEach((count) => {{ console.log(count); }})
Arrow functions are cleaner.
JavaScript
var z int = 'hello'
var z string = 'hello'
Type mismatch.
Go
local item = 17
local item = 17
Correct.
Lua
$temp = 52; if ($temp = 52) {{}}
$temp = 52; if ($temp == 52) {{}}
Use ==.
PHP
console.log('data'
console.log('data')
Close parenthesis.
JavaScript
class Order def method end end
class Order def method end end
Correct.
Ruby
void render(); int main(){{render();}}
void render(); // prototype int main(){{render();}}
Declare before use.
C++
function bar(): void {{ return 27; }}
function bar(): number {{ return 27; }}
Return type mismatch.
TypeScript
<hr></hr>
<hr>
Self-closing.
HTML
def compute(result): return result + 1
def compute(result): return result + 1
Correct.
Python
for (x in data)
for (x of data)
for...in iterates keys.
JavaScript
if item = 51 {{}}
if item == 51 {{}}
Use ==.
Swift
INSERT INTO products VALUES ('result',30)
INSERT INTO products (name, status) VALUES ('result',30);
Specify columns.
SQL
var x int
var x int
Correct.
Go
var y int = 'hello'
var y string = 'hello'
Type mismatch.
Go
function render() {{ return {{key:'data'}} }}
function render() {{ return {{key:'data'}}; }}
Return object on same line.
JavaScript
DELETE FROM orders WHERE status=30
DELETE FROM orders WHERE status=30;
Add semicolon.
SQL
<div><p>hello</div></p>
<div><p>hello</p></div>
Nest properly.
HTML
.Product {{ color: green; }}
.Product {{ color: green; }}
Correct.
CSS
try {{ throw 'value'; }} catch(e) {{}}
try {{ throw new Error('value'); }} catch(e) {{}}
Throw Error objects.
JavaScript
let b: Int = 'result'
let b: String = 'result'
Fix type.
Swift
const temp = 94; temp = 20;
let temp = 94; temp = 20;
Cannot reassign const.
JavaScript
test
test()
Add parentheses.
Swift
WHERE name = '68'
WHERE name = 68
Don't quote integer.
SQL
cin >> c;
int c; cin >> c;
Declare variable.
C++
val val = 30; val = 78
var val = 30; val = 78
Use var for reassignment.
Scala
if (a = 27) {{}}
if (a === 27) {{}}
Use === for equality.
JavaScript
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
yield val
yield val
Correct yield.
Python
<center>output</center>
<div style='text-align:center;'>output</div>
Use CSS.
HTML
var x = 55;
var x = 55;
Correct.
Dart
let count = 42; let count = 38;
let count = 42; count = 38;
Duplicate declaration.
JavaScript
69y = 10
y69 = 10
Variable cannot start with digit.
Python
fmt.Println 'info'
fmt.Println('info')
Missing parentheses.
Go
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
int item = 'data';
String item = 'data';
Type mismatch.
Dart
math.sqrt(86)
import math math.sqrt(86)
Import module first.
Python
if [ $num = 69 ]; then
if [ "$num" = 69 ]; then
Quote variable.
Shell
cin >> val cout << val;
cin >> val; cout << val;
Add semicolon.
C++
while read line; do echo $line; done < data.txt
while read line; do echo $line; done < data.txt
Correct.
Shell
{{'age':79, 'value' 44}}
{{'age':79, 'value':44}}
Colon missing.
Python
UPDATE items SET age='output' WHERE status=98
UPDATE items SET age='output' WHERE status=98;
Add semicolon.
SQL
data[60]
if (length(data) >= 60) data[60]
Check length.
R
["test", 20]
["test", 20]
Correct.
JSON
function bar(count:string){{return count;}} bar(89);
function bar(count:string){{return count;}} bar('data');
Pass correct type.
TypeScript
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
SELECT COUNT(*) FROM orders
SELECT COUNT(*) FROM orders;
Missing semicolon.
SQL
local data = 36
local data = 36
Correct.
Lua
with open('log.txt') as fp: data = fp.read()
with open('log.txt') as fp: data = fp.read()
Correct.
Python
String num = 'value';
String num = "value";
Double quotes.
Java
console.log('test'
console.log('test')
Close parenthesis.
JavaScript
String name = 'result';
String name = 'result';
Correct.
Dart
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
data[54]
if data.indices.contains(54) {{ data[54] }}
Check index.
Swift
void main() {{ print('result') }}
void main() {{ print('result'); }}
Add semicolon.
Dart
let mut y=86; let ref1=&mut y; let ref2=&mut y;
let mut y=86; {{ let ref1=&mut y; }} let ref2=&mut y;
Only one mutable borrow.
Rust
<?php // code ?>
<?php // code ?>
Correct.
PHP
<div color=red>
<div style='color:red;'>
Use style attribute.
CSS
class Order def method end end
class Order def method end end
Correct.
Ruby
echo 'info'
echo 'info';
Add semicolon.
PHP
const user:Person = {{name:'message'}};
const user:Person = {{name:'message', age:10}};
Add missing property.
TypeScript
let v=vec![59,11,46]; let first=&v[0]; v.push(92);
let mut v=vec![59,11,46]; let first=v[0]; v.push(92);
Copy instead of reference.
Rust
val y: Int = 'info'
val y: String = 'info'
Fix type.
Kotlin
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
let foo = 61;
let foo = 61;
Correct.
JavaScript
arr(8)
if length(arr) >= 8, arr(8), end
Check length.
MATLAB
my @arr = (74,7,74);
my @arr = (74,7,74);
Correct.
Perl
$list[54] = 5;
if (isset($list[54])) $list[54] = 5;
Check existence.
PHP
<br></br>
<br>
Self-closing.
HTML
print('result')
print('result')
Correct.
R
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(61);
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(61);
Correct.
Node.js