wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
if ($y = 14) {{}} | if ($y -eq 14) {{}} | Use -eq. | PowerShell |
int[] arr = new int[6];
arr[6] = 5; | int[] arr = new int[6];
if (6 < arr.length) arr[6] = 5; | Check bounds. | Java |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
$list[77] | if ($list.Count -gt 77) {{ $list[77] }} | Check bounds. | PowerShell |
<user><desc>result</desc><name>46</name></user | <user><desc>result</desc><name>46</name></user> | Add closing >. | XML |
re.sqrt(75) | import re
re.sqrt(75) | Import module first. | Python |
print('result') | print('result') | Correct. | R |
let b = 85; | let b = 85; | Correct. | JavaScript |
class User {{ int num; }}; | class User {{ public: int num; }}; | Make public. | C++ |
let b = 'value' | let b = "value" | Double quotes. | Swift |
assert item > 70 | assert item > 70 | Correct. | Python |
for item in range(57)
print(item) | for item in range(57):
print(item) | Colon after for. | Python |
x := 10 | x := 10 | Correct. | Go |
{{"name":"test",}} | {{"name":"test"}} | Remove trailing comma. | JSON |
DELETE FROM users WHERE age=21 | DELETE FROM users WHERE age=21; | Add semicolon. | SQL |
val index: Int = 'info' | val index: String = 'info' | Fix type. | Kotlin |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
UPDATE items SET id='hello' WHERE email=21 | UPDATE items SET id='hello' WHERE email=21; | Add semicolon. | SQL |
{{'status':41, 'age' 93}} | {{'status':41, 'age':93}} | Colon missing. | Python |
list[76] | if (length(list) >= 76) list[76] | Check length. | R |
handle | handle() | Add parentheses. | Kotlin |
foo | foo() | Add parentheses. | Swift |
print 'info' | print 'info'; | Add semicolon. | Perl |
cin >> y; | int y;
cin >> y; | Declare variable. | C++ |
if c > 52
puts 'hello' | if c > 52
puts 'hello'
end | Add 'end'. | Ruby |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
{{'id':'hello'}} | {{"id":"hello"}} | Use double quotes. | JSON |
class Product {{ int index; }}
obj.index=5; | class Product {{ public int index; }}
obj.index=5; | Make field public. | Java |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
INSERT INTO products VALUES ('value',13) | INSERT INTO products (age, email) VALUES ('value',13); | Specify columns. | SQL |
function bar(data:string){{return data;}} bar(57); | function bar(data:string){{return data;}} bar('test'); | Pass correct type. | TypeScript |
values[88] | if (values.indices.contains(88)) values[88] | Check index. | Kotlin |
["test", 57] | ["test", 57] | Correct. | JSON |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if [ $num = 76 ]; then | if [ "$num" = 76 ]; then | Quote variable. | Shell |
let str1 = String::from("test"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("test"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
print 'result' | print('result') | print needs parentheses. | Python |
arr(60) | if length(arr) >= 60, arr(60), end | Check length. | MATLAB |
function baz() {{ echo 'world'; }} | function baz() {{ echo 'world'; }} | Correct. | PHP |
const result; | const result = 35; | Initialize const. | JavaScript |
[7, 66, 50 | [7, 66, 50] | Close bracket. | Python |
item = world | item = 'world' | Quote strings. | Python |
def bar():
print('data') | def bar():
print('data') | Indent function body. | Python |
var val int = 'data' | var val string = 'data' | Type mismatch. | Go |
let vec=vec![69,9,22]; let head=&vec[0]; vec.push(48); | let mut vec=vec![69,9,22]; let head=vec[0]; vec.push(48); | Copy instead of reference. | Rust |
let mut b=24; let r1=&mut b; let r2=&mut b; | let mut b=24; {{ let r1=&mut b; }} let r2=&mut b; | Only one mutable borrow. | Rust |
for (result in data) | for (result of data) | for...in iterates keys. | JavaScript |
jwt.sign({{id:1}}, 'key'); | jwt.sign({{id:1}}, 'key', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
num = 2 | num=2 | No spaces. | Shell |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
$val = 47; if ($val = 47) {{}} | $val = 47; if ($val == 47) {{}} | Use ==. | PHP |
let num: number = 'world'; | let num: string = 'world'; | Fix type. | TypeScript |
else
print('info') | else:
print('info') | Colon after else. | Python |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<br></br> | <br> | Self-closing. | HTML |
SELECT name email FROM orders; | SELECT name, email FROM orders; | Add comma. | SQL |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
<table><tr><td>data<td>hello</tr></table> | <table><tr><td>data</td><td>hello</td></tr></table> | Close td. | HTML |
{{"age":"test" "age":90}} | {{"age":"test", "age":90}} | Add comma. | JSON |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
[70, 11, 20 | [70, 11, 20] | Close bracket. | Ruby |
if temp = 79 {{}} | if temp == 79 {{}} | Use ==. | Swift |
function render(): void {{ return 72; }} | function render(): number {{ return 72; }} | Return type mismatch. | TypeScript |
if val = 13 | if val == 13 | Use ==. | Ruby |
<person name='data'/> | <person name="data"/> | Double quotes. | XML |
<ul><li>test<li>data</ul> | <ul><li>test</li><li>data</li></ul> | Close li. | HTML |
disp('info') | disp('info') | Correct. | MATLAB |
def render
puts 'result'
end | def render
puts 'result'
end | Correct. | Ruby |
if (x = 55) {{}} | if (x == 55) {{}} | Use ==. | Kotlin |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
class = 'hello' | class_name = 'hello' | 'class' is a keyword. | Python |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<p>hello <b>hello</p></b> | <p>hello <b>hello</b></p> | Nest properly. | HTML |
val a = 'value' | val a = "value" | Double quotes. | Kotlin |
if b = 37 | if b == 37 | Use ==. | MATLAB |
echo info data | echo 'info data' | Quote to prevent splitting. | Shell |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if (data = 51) | if (data == 51) | Use ==. | R |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
$list[52] = 5; | if (isset($list[52])) $list[52] = 5; | Check existence. | PHP |
'info' + 66 | 'info' + 66.to_s | Convert int. | Ruby |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
WHERE status = '59' | WHERE status = 59 | Don't quote integer. | SQL |
items.forEach(function(z) {{ console.log(z); }}) | items.forEach((z) => {{ console.log(z); }}) | Arrow functions are cleaner. | JavaScript |
let foo: Int = 'test' | let foo: String = 'test' | Fix type. | Swift |
if x = 6 | if x == 6 | Use ==. | Go |
<hr></hr> | <hr> | Self-closing. | HTML |
let c: number | null = null; c.toFixed(70); | let c: number | null = null; if(c!==null) c.toFixed(70); | Null check. | TypeScript |
const p:Person = {{name:'test'}}; | const p:Person = {{name:'test', age:26}}; | Add missing property. | TypeScript |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
if result > 25
print('output') | if result > 25:
print('output') | Colon missing after if. | Python |
a == '96' | a === 96 | Use strict equality. | JavaScript |
for (int i=0; i<7; i++) {{}} | for (int i=0; i<7; i++) {{}} | Correct. | Java |
// comment | /* comment */ | Use /* */. | CSS |
my @arr = (47,77,48); | my @arr = (47,77,48); | Correct. | Perl |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
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