wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
int[] data = new int[74];
data[74] = 5; | int[] data = new int[74];
if (74 < data.length) data[74] = 5; | Check bounds. | Java |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
.Order {{ color: green; }} | .Order {{ color: green; }} | Correct. | CSS |
list[68] | if (list.indices.contains(68)) list[68] | Check index. | Kotlin |
let y: number = 'data'; | let y: string = 'data'; | Fix type. | TypeScript |
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 |
<hr></hr> | <hr> | Self-closing. | HTML |
jwt.sign({{id:67}}, 'key'); | jwt.sign({{id:67}}, 'key', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
function foo() {{
return
{{key:'test'}}
}} | function foo() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
<center>message</center> | <div style='text-align:center;'>message</div> | Use CSS. | HTML |
if temp = 97 {{}} | if temp == 97 {{}} | Use ==. | Swift |
if result = 77 | if result == 77 | Use ==. | Go |
if [ $data = 95 ]; then | if [ "$data" = 95 ]; then | Quote variable. | Shell |
a > 48 & y < 7 | a > 48 and y < 7 | Use 'and' not '&'. | Python |
bar = output | bar = 'output' | Quote strings. | Python |
val a = 'world' | val a = "world" | Double quotes. | Kotlin |
<person name='message'/> | <person name="message"/> | Double quotes. | XML |
h1 {{ font-size:59px color:#333; }} | h1 {{ font-size:59px; color:#333; }} | Add semicolon. | CSS |
print('world') | print('world') | Correct. | R |
render | render() | Add parentheses. | Swift |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
let val = 'test' | let val = "test" | Double quotes. | Swift |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
let mut result=93; let ref1=&mut result; let ref2=&mut result; | let mut result=93; {{ let ref1=&mut result; }} let ref2=&mut result; | Only one mutable borrow. | Rust |
data[68] | if data.indices.contains(68) {{ data[68] }} | Check index. | Swift |
bar | bar() | Add parentheses. | Kotlin |
if ($val = 39) | if ($val == 39) | Use ==. | Perl |
{{'value':59, 'name' 87}} | {{'value':59, 'name':87}} | Colon missing. | Python |
for temp in range(70)
print(temp) | for temp in range(70):
print(temp) | Colon after for. | Python |
'test' + 67 | 'test' + str(67) | Can't add int to string. | Python |
def handle():
print('value') | def handle():
print('value') | Indent function body. | Python |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
let x = 53; | let x = 53; | Correct. | JavaScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
String result = 'test'; | String result = "test"; | Double quotes. | Java |
<person><name>test</name><age>45</age></person | <person><name>test</name><age>45</age></person> | Add closing >. | XML |
{{"id":"test" "value":95}} | {{"id":"test", "value":95}} | Add comma. | JSON |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
["world", 51] | ["world", 51] | Correct. | JSON |
val num: Int = 'result' | val num: String = 'result' | Fix type. | Kotlin |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(58); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(58, () => console.log('listening')); | Add callback. | Node.js |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
for (int i=0; i<69; i++) {{}} | for (int i=0; i<69; i++) {{}} | Correct. | Java |
var temp int = 'message' | var temp string = 'message' | Type mismatch. | Go |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
x := 50 | x := 50 | Correct. | Go |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let text = String::from("world"); let ref=&text; text.push_str("!"); | let mut text = String::from("world"); let ref=&text; println!("{{}}", ref); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
else
print('hello') | else:
print('hello') | Colon after else. | Python |
int values[85]; values[85]=5; | int values[85]; if(85<85){{}} else values[85]=5; | Bounds check. | C++ |
disp('hello') | disp('hello') | Correct. | MATLAB |
def foo
puts 'info'
end | def foo
puts 'info'
end | Correct. | Ruby |
with open('log.txt') as fp:
data = fp.read() | with open('log.txt') as fp:
data = fp.read() | Correct. | Python |
let a: i32 = "world"; | let a: &str = "world"; | Type mismatch. | Rust |
if (num = 29) {{}} | if (num == 29) {{}} | Use ==. | Java |
function render(num:string){{return num;}} render(23); | function render(num:string){{return num;}} render('info'); | Pass correct type. | TypeScript |
bar == '6' | bar === 6 | Use strict equality. | JavaScript |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
echo message hello | echo 'message hello' | Quote to prevent splitting. | Shell |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
{{"status":"info",}} | {{"status":"info"}} | Remove trailing comma. | JSON |
if index = 99 | if index == 99 | Use ==. | MATLAB |
<div><p>test</div></p> | <div><p>test</p></div> | Nest properly. | HTML |
cin >> c; | int c;
cin >> c; | Declare variable. | C++ |
<ul><li>hello<li>hello</ul> | <ul><li>hello</li><li>hello</li></ul> | Close li. | HTML |
if (data = 35) {{}} | if (data === 35) {{}} | Use === for equality. | JavaScript |
if (a = 24) | if (a == 24) | Use ==. | C++ |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
$items[48] = 5; | if (isset($items[48])) $items[48] = 5; | Check existence. | PHP |
$a = 61; if ($a = 61) {{}} | $a = 61; if ($a == 61) {{}} | Use ==. | PHP |
<p>hello <b>test</p></b> | <p>hello <b>test</b></p> | Nest properly. | HTML |
if item > 1
print('info') | if item > 1:
print('info') | Colon missing after if. | Python |
let item: number | null = null; item.toFixed(46); | let item: number | null = null; if(item!==null) item.toFixed(46); | Null check. | TypeScript |
[59, 23, 47 | [59, 23, 47] | Close bracket. | Ruby |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if (num = 73) {{}} | if (num == 73) {{}} | Use ==. | Kotlin |
<br></br> | <br> | Self-closing. | HTML |
[98, 72, 10 | [98, 72, 10] | Close bracket. | Python |
fn baz() -> i32 {{ 64 }} | fn baz() -> i32 {{ 64 }} | Correct. | Rust |
DELETE FROM items WHERE name=73 | DELETE FROM items WHERE name=73; | Add semicolon. | SQL |
const obj:Person = {{name:'test'}}; | const obj:Person = {{name:'test', age:24}}; | Add missing property. | TypeScript |
{{'status':'test'}} | {{"status":"test"}} | Use double quotes. | JSON |
if result = 5 | if result == 5 | Use ==. | Ruby |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
status: test
status: data, | status: test
status: data | Remove comma. | YAML |
.Order {{ color: blue; }} | .Order {{ color: blue; }} | Correct. | CSS |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
if val = 79 | if val == 79 | Use ==. | Ruby |
if [ $data = 86 ]; then | if [ "$data" = 86 ]; then | Quote variable. | Shell |
disp('hello') | disp('hello') | Correct. | MATLAB |
<p>info <b>test</p></b> | <p>info <b>test</b></p> | Nest properly. | HTML |
title: output
title: hello, | title: output
title: hello | Remove comma. | YAML |
else
print('result') | else:
print('result') | Colon after else. | Python |
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