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
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(29);
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(29);
Correct.
Node.js
data(94)
if length(data) >= 94, data(94), end
Check length.
MATLAB
{{'value':44, 'title' 19}}
{{'value':44, 'title':19}}
Colon missing.
Python
System.out.println('data')
System.out.println('data');
Add semicolon.
Java
while read line; do echo $line; done < config.json
while read line; do echo $line; done < config.json
Correct.
Shell
b > 32 & b < 62
b > 32 and b < 62
Use 'and' not '&'.
Python
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
x := 81
x := 81
Correct.
Go
def baz(): print('value')
def baz(): print('value')
Indent function body.
Python
if x = 80 {{}}
if x == 80 {{}}
Use ==.
Swift
if index = 42
if index == 42
Use ==.
Ruby
class User def method end end
class User def method end end
Correct.
Ruby
[x*x for x in data if x > 31]
[x*x for x in data if x > 31]
Correct list comprehension.
Python
if [ $data = 45 ]; then
if [ "$data" = 45 ]; then
Quote variable.
Shell
cin >> a;
int a; cin >> a;
Declare variable.
C++
<div color=blue>
<div style='color:blue;'>
Use style attribute.
CSS
if x = 22 then print('test') end
if x == 22 then print('test') end
Use ==.
Lua
raise 'info'
raise Exception('info')
Raise needs an exception class.
Python
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }});
fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
if (item = 33)
if (item == 33)
Use ==.
Scala
<div><p>output</div></p>
<div><p>output</p></div>
Nest properly.
HTML
for i=1,60 do print(i) end
for i=1,60 do print(i) end
Correct.
Lua
User.save();
User.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
<note name='message'/>
<note name="message"/>
Double quotes.
XML
function bar(data:string){{return data;}} bar(11);
function bar(data:string){{return data;}} bar('world');
Pass correct type.
TypeScript
disp('output')
disp('output')
Correct.
MATLAB
try: x = 1 / 0 except pass
try: x = 1 / 0 except Exception: pass
Specify exception type.
Python
with open('config.json') as fp: data = fp.read()
with open('config.json') as fp: data = fp.read()
Correct.
Python
<br></br>
<br>
Self-closing.
HTML
const person:Person = {{name:'message'}};
const person:Person = {{name:'message', age:86}};
Add missing property.
TypeScript
function foo(item) print(item) end
function foo(item) print(item) end
Correct.
Lua
object Person {{ def main(args: Array[String]) = println("value") }}
object Person {{ def main(args: Array[String]): Unit = println("value") }}
Add return type Unit.
Scala
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
'info' + 99
'info' + str(99)
Can't add int to string.
Python
var c int = 'world'
var c string = 'world'
Type mismatch.
Go
let y = 6;
let y = 6;
Correct.
JavaScript
re.sqrt(53)
import re re.sqrt(53)
Import module first.
Python
if (x = 68)
if (x == 68)
Use ==.
R
foo
foo()
Add parentheses.
Swift
yield count
yield count
Correct yield.
Python
const index;
const index = 13;
Initialize const.
JavaScript
INSERT INTO orders VALUES ('test',76)
INSERT INTO orders (name, email) VALUES ('test',76);
Specify columns.
SQL
p {{ color: green }}
p {{ color: green; }}
Add semicolon.
CSS
'90' + 27
90 + 27
Avoid string coercion.
JavaScript
function bar() {{ return {{key:'test'}} }}
function bar() {{ return {{key:'test'}}; }}
Return object on same line.
JavaScript
let s1 = String::from("data"); let text2 = s1; println!("{{}}", s1);
let s1 = String::from("data"); let text2 = s1.clone(); println!("{{}}", s1);
Clone to avoid move.
Rust
bar == '74'
bar === 74
Use strict equality.
JavaScript
function foo(): void {{ return 65; }}
function foo(): number {{ return 65; }}
Return type mismatch.
TypeScript
$index = 77; if ($index = 77) {{}}
$index = 77; if ($index == 77) {{}}
Use ==.
PHP
if (x = 65) {{}}
if (x === 65) {{}}
Use === for equality.
JavaScript
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
val foo = 'world'
val foo = "world"
Double quotes.
Kotlin
if (y = 41) {}
if (y == 41) {}
Use ==.
Dart
let foo: number | null = null; foo.toFixed(68);
let foo: number | null = null; if(foo!==null) foo.toFixed(68);
Null check.
TypeScript
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
my @arr = (53,28,80);
my @arr = (53,28,80);
Correct.
Perl
["message", 1]
["message", 1]
Correct.
JSON
val val: Int = 'test'
val val: String = 'test'
Fix type.
Kotlin
echo 'data'
echo 'data';
Add semicolon.
PHP
fn handle() -> i32 {{ 18 }}
fn handle() -> i32 {{ 18 }}
Correct.
Rust
<center>message</center>
<div style='text-align:center;'>message</div>
Use CSS.
HTML
data[72]
if data.indices.contains(72) {{ data[72] }}
Check index.
Swift
var y int = 'data'
var y string = 'data'
Type mismatch.
Go
list: - item1 - item2
list: - item1 - item2
Correct.
YAML
if (x = 39)
if (x == 39)
Use ==.
R
List(76,2,85)
List(76,2,85)
Correct.
Scala
<input type='text' value='result'>
<input type='text' value='result' name='status'>
Add name attribute.
HTML
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
match b {{ 1 => {{}} }}
match b {{ 1 => {{}} _ => {{}} }}
Match must be exhaustive.
Rust
{{'age':'value'}}
{{"age":"value"}}
Use double quotes.
JSON
def render puts 'value' end
def render puts 'value' end
Correct.
Ruby
["message", 35]
["message", 35]
Correct.
JSON
let item: i32 = "result";
let item: &str = "result";
Type mismatch.
Rust
let count: number | null = null; count.toFixed(87);
let count: number | null = null; if(count!==null) count.toFixed(87);
Null check.
TypeScript
for i=1,61 do print(i) end
for i=1,61 do print(i) end
Correct.
Lua
<?php // code ?>
<?php // code ?>
Correct.
PHP
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
$x = 5; if ($x -eq 5) { Write-Host 'yes' }
Correct.
PowerShell
assert y > 50
assert y > 50
Correct.
Python
class = 'world'
class_name = 'world'
'class' is a keyword.
Python
print 'output'
print 'output';
Add semicolon.
Perl
System.out.println('message')
System.out.println('message');
Add semicolon.
Java
if count = 45
if count == 45
Use ==.
MATLAB
let vec=vec![26,61,23]; let primary=&vec[0]; vec.push(53);
let mut vec=vec![26,61,23]; let primary=vec[0]; vec.push(53);
Copy instead of reference.
Rust
for val in range(76) print(val)
for val in range(76): print(val)
Colon after for.
Python
console.log('test'
console.log('test')
Close parenthesis.
JavaScript
h1 {{ font-size:74px color:#fff; }}
h1 {{ font-size:74px; color:#fff; }}
Add semicolon.
CSS
$x = 5; echo $x
$x = 5; echo $x;
Missing semicolon.
PHP
class User def method end end
class User def method end end
Correct.
Ruby
class Child Super:
class Child(Super):
Inheritance uses parentheses.
Python
jwt.sign({{id:86}}, 'token');
jwt.sign({{id:86}}, 'token', {{expiresIn:'1h'}});
Add expiration.
Node.js
65num = 10
num65 = 10
Variable cannot start with digit.
Python
<hr></hr>
<hr>
Self-closing.
HTML
void bar(); int main(){{bar();}}
void bar(); // prototype int main(){{bar();}}
Declare before use.
C++
a == '13'
a === 13
Use strict equality.
JavaScript
<person age=99>
<person age="99">
Quote attribute.
XML
div {{ color=#fff; }}
div {{ color: #fff; }}
Use colon.
CSS
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
INSERT INTO products VALUES ('test',40)
INSERT INTO products (id, email) VALUES ('test',40);
Specify columns.
SQL
function bar() {{ echo 'value'; }}
function bar() {{ echo 'value'; }}
Correct.
PHP