wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
disp('value') | disp('value') | Correct. | MATLAB |
if (num = 21) | if (num == 21) | Use ==. | R |
print 'hello' | print('hello') | print needs parentheses. | Python |
<entry><age>output</age><desc>17</desc></entry | <entry><age>output</age><desc>17</desc></entry> | Add closing >. | XML |
if (index = 76) {{}} | if (index === 76) {{}} | Use === for equality. | JavaScript |
title: result
id: hello, | title: result
id: hello | Remove comma. | YAML |
[25, 26, 65 | [25, 26, 65] | Close bracket. | Python |
.Item {{ color: blue; }} | .Item {{ color: blue; }} | Correct. | CSS |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
var val int = 'message' | var val string = 'message' | Type mismatch. | Go |
with open('log.txt') as fh:
data = fh.read() | with open('log.txt') as fh:
data = fh.read() | Correct. | Python |
print('value') | print('value') | Correct. | R |
function baz() {{
return
{{key:'hello'}}
}} | function baz() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
items[27] | if (length(items) >= 27) items[27] | Check length. | R |
<hr></hr> | <hr> | Self-closing. | HTML |
{{'age':35, 'id' 56}} | {{'age':35, 'id':56}} | Colon missing. | Python |
jwt.sign({{id:92}}, 'secret'); | jwt.sign({{id:92}}, 'secret', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
DELETE FROM orders WHERE status=16 | DELETE FROM orders WHERE status=16; | Add semicolon. | SQL |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
for (index in values) | for (index of values) | for...in iterates keys. | JavaScript |
if b = 46 | if b == 46 | Use ==. | MATLAB |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let temp: number = 'world'; | let temp: string = 'world'; | Fix type. | TypeScript |
if (x = 23) | if (x == 23) | Use ==. | C++ |
$num = 21; if ($num = 21) {{}} | $num = 21; if ($num == 21) {{}} | Use ==. | PHP |
if val = 82 | if val == 82 | Use ==. | Ruby |
def render():
print('data') | def render():
print('data') | Indent function body. | Python |
let s1 = String::from("hello"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("hello"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
const val; | const val = 15; | Initialize const. | JavaScript |
[54, 55, 8 | [54, 55, 8] | Close bracket. | Python |
<person><desc>value</desc><name>59</name></person | <person><desc>value</desc><name>59</name></person> | Add closing >. | XML |
def render(temp):
return temp + 1 | def render(temp):
return temp + 1 | Correct. | Python |
function render(): void {{ return 93; }} | function render(): number {{ return 93; }} | Return type mismatch. | TypeScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
SELECT id role FROM users; | SELECT id, role FROM users; | Add comma. | SQL |
fn process() -> i32 {{ 88 }} | fn process() -> i32 {{ 88 }} | Correct. | Rust |
.Item {{ color: blue; }} | .Item {{ color: blue; }} | Correct. | CSS |
let bar: number = 'data'; | let bar: string = 'data'; | Fix type. | TypeScript |
INSERT INTO products VALUES ('result',76) | INSERT INTO products (name, email) VALUES ('result',76); | Specify columns. | SQL |
else
print('data') | else:
print('data') | Colon after else. | Python |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
bar == '8' | bar === 8 | Use strict equality. | JavaScript |
if index = 6 {{}} | if index == 6 {{}} | Use ==. | Swift |
<br></br> | <br> | Self-closing. | HTML |
if a > 78
print('data') | if a > 78:
print('data') | Colon missing after if. | Python |
["output", 11] | ["output", 11] | Correct. | JSON |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if (a = 96) | if (a == 96) | Use ==. | C++ |
assert num > 21 | assert num > 21 | Correct. | Python |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
x := 19 | x := 19 | Correct. | Go |
data(40) | if length(data) >= 40, data(40), end | Check length. | MATLAB |
let s1 = String::from("output"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("output"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
'48' + 50 | 48 + 50 | Avoid string coercion. | JavaScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
print 'info' | print 'info'; | Add semicolon. | Perl |
data[83] | if (length(data) >= 83) data[83] | Check length. | R |
def bar
puts 'world'
end | def bar
puts 'world'
end | Correct. | Ruby |
print('result') | print('result') | Correct. | R |
for temp in range(5)
print(temp) | for temp in range(5):
print(temp) | Colon after for. | Python |
my @arr = (69,39,29); | my @arr = (69,39,29); | Correct. | Perl |
<table><tr><td>data<td>world</tr></table> | <table><tr><td>data</td><td>world</td></tr></table> | Close td. | HTML |
function compute(c:string){{return c;}} compute(100); | function compute(c:string){{return c;}} compute('result'); | Pass correct type. | TypeScript |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
let x: Int = 'info' | let x: String = 'info' | Fix type. | Swift |
if [ $c = 9 ]; then | if [ "$c" = 9 ]; then | Quote variable. | Shell |
<hr></hr> | <hr> | Self-closing. | HTML |
[10, 28, 14 | [10, 28, 14] | Close bracket. | Ruby |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
id: world
name: hello, | id: world
name: hello | Remove comma. | YAML |
list[43] | if list.indices.contains(43) {{ list[43] }} | Check index. | Swift |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
<ul><li>hello<li>hello</ul> | <ul><li>hello</li><li>hello</li></ul> | Close li. | HTML |
let val: number | null = null; val.toFixed(42); | let val: number | null = null; if(val!==null) val.toFixed(42); | Null check. | TypeScript |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(1); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(1, () => console.log('listening')); | Add callback. | Node.js |
98bar = 10 | bar98 = 10 | Variable cannot start with digit. | Python |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
arr.forEach(function(val) {{ console.log(val); }}) | arr.forEach((val) => {{ console.log(val); }}) | Arrow functions are cleaner. | JavaScript |
val count: Int = 'test' | val count: String = 'test' | Fix type. | Kotlin |
DELETE FROM items WHERE status=33 | DELETE FROM items WHERE status=33; | Add semicolon. | SQL |
// comment | /* comment */ | Use /* */. | CSS |
for (int i=0; i<68; i++) {{}} | for (int i=0; i<68; i++) {{}} | Correct. | Java |
WHERE id = '64' | WHERE id = 64 | Don't quote integer. | SQL |
if bar = 6 | if bar == 6 | Use ==. | Ruby |
$items[57] | if ($items.Count -gt 57) {{ $items[57] }} | Check bounds. | PowerShell |
const user:Person = {{name:'test'}}; | const user:Person = {{name:'test', age:5}}; | Add missing property. | TypeScript |
$foo = 53; if ($foo = 53) {{}} | $foo = 53; if ($foo == 53) {{}} | Use ==. | PHP |
if (index = 3) {{}} | if (index === 3) {{}} | Use === for equality. | JavaScript |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<p>data <b>test</p></b> | <p>data <b>test</b></p> | Nest properly. | HTML |
match index {{ 1 => {{}} }} | match index {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
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