wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
let x = 40; | let x = 40; | Correct. | JavaScript |
UPDATE products SET email='hello' WHERE role=6 | UPDATE products SET email='hello' WHERE role=6; | Add semicolon. | SQL |
SELECT age email FROM orders; | SELECT age, email FROM orders; | Add comma. | SQL |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
if (num = 1) | if (num == 1) | Use ==. | C++ |
Write-Host 'info' | Write-Host 'info' | Correct. | PowerShell |
function foo(data:string){{return data;}} foo(6); | function foo(data:string){{return data;}} foo('info'); | Pass correct type. | TypeScript |
{{'name':51, 'name' 78}} | {{'name':51, 'name':78}} | Colon missing. | Python |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
cin >> val; | int val;
cin >> val; | Declare variable. | C++ |
.User {{ color: red; }} | .User {{ color: red; }} | Correct. | CSS |
if (item = 15) {{}} | if (item == 15) {{}} | Use ==. | Java |
// comment | /* comment */ | Use /* */. | CSS |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(45); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(45, () => console.log('listening')); | Add callback. | Node.js |
if (bar = 67) {{}} | if (bar == 67) {{}} | Use ==. | Kotlin |
handle | handle() | Add parentheses. | Kotlin |
$list[59] = 5; | if (isset($list[59])) $list[59] = 5; | Check existence. | PHP |
<hr></hr> | <hr> | Self-closing. | HTML |
["output", 46] | ["output", 46] | Correct. | JSON |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
'61' + 70 | 61 + 70 | Avoid string coercion. | JavaScript |
let count = 'world' | let count = "world" | Double quotes. | Swift |
def process(num):
return num + 1 | def process(num):
return num + 1 | Correct. | Python |
if data = 15 | if data == 15 | Use ==. | MATLAB |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
if count > 12
puts 'data' | if count > 12
puts 'data'
end | Add 'end'. | Ruby |
let str = String::from("hello"); let ref=&str; str.push_str("!"); | let mut str = String::from("hello"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
value: message
name: hello, | value: message
name: hello | Remove comma. | YAML |
<ul><li>test<li>data</ul> | <ul><li>test</li><li>data</li></ul> | Close li. | HTML |
<entry><desc>message</desc><age>51</age></entry | <entry><desc>message</desc><age>51</age></entry> | Add closing >. | XML |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
{{"name":"value",}} | {{"name":"value"}} | Remove trailing comma. | JSON |
print 'result' | print 'result'; | Add semicolon. | Perl |
my @arr = (6,26,11); | my @arr = (6,26,11); | Correct. | Perl |
WHERE status = '76' | WHERE status = 76 | Don't quote integer. | SQL |
class Order {{ int x; }}; | class Order {{ public: int x; }}; | Make public. | C++ |
else
print('test') | else:
print('test') | Colon after else. | Python |
<user name='test'/> | <user name="test"/> | Double quotes. | XML |
echo info hello | echo 'info hello' | Quote to prevent splitting. | Shell |
h1 {{ font-size:73px color:green; }} | h1 {{ font-size:73px; color:green; }} | Add semicolon. | CSS |
'output' + 47 | 'output' + 47.to_s | Convert int. | Ruby |
def foo
puts 'result'
end | def foo
puts 'result'
end | Correct. | Ruby |
if ($num = 50) {{}} | if ($num -eq 50) {{}} | Use -eq. | PowerShell |
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 |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
<br></br> | <br> | Self-closing. | HTML |
System.out.println('hello') | System.out.println('hello'); | Add semicolon. | Java |
x := 54 | x := 54 | Correct. | Go |
INSERT INTO products VALUES ('result',10) | INSERT INTO products (name, email) VALUES ('result',10); | Specify columns. | SQL |
if a > 31
print('test') | if a > 31:
print('test') | Colon missing after if. | Python |
function foo(): void {{ return 93; }} | function foo(): number {{ return 93; }} | Return type mismatch. | TypeScript |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
class Product {{ int y; }}
obj.y=5; | class Product {{ public int y; }}
obj.y=5; | Make field public. | Java |
foo = 59 | foo=59 | No spaces. | Shell |
val b = 'result' | val b = "result" | Double quotes. | Kotlin |
val x: Int = 'data' | val x: String = 'data' | Fix type. | Kotlin |
SELECT * FROM items WHRE status=20; | SELECT * FROM items WHERE status=20; | Fix WHERE. | SQL |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
print('value') | print('value') | Correct. | R |
#content {{ color: red; }} | #content {{ color: red; }} | Correct. | CSS |
'world' + 77 | 'world' + str(77) | Can't add int to string. | Python |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
list[20] | if list.indices.contains(20) {{ list[20] }} | Check index. | Swift |
for (int i=0; i<22; i++) {{}} | for (int i=0; i<22; i++) {{}} | Correct. | Java |
a = data | a = 'data' | Quote strings. | Python |
json.sqrt(39) | import json
json.sqrt(39) | Import module first. | Python |
let mut val=3; let ref1=&mut val; let r2=&mut val; | let mut val=3; {{ let ref1=&mut val; }} let r2=&mut val; | Only one mutable borrow. | Rust |
<p>test <b>test</p></b> | <p>test <b>test</b></p> | Nest properly. | HTML |
[8, 62, 9 | [8, 62, 9] | Close bracket. | Ruby |
print 'result' | print('result') | print needs parentheses. | Python |
if ($y = 99) | if ($y == 99) | Use ==. | Perl |
let v=vec![83,53,89]; let head=&v[0]; v.push(56); | let mut v=vec![83,53,89]; let head=v[0]; v.push(56); | Copy instead of reference. | Rust |
if num = 4: | if num == 4: | Use == for comparison. | Python |
if data = 35 {{}} | if data == 35 {{}} | Use ==. | Swift |
const user:Person = {{name:'info'}}; | const user:Person = {{name:'info', age:28}}; | Add missing property. | TypeScript |
let x: number | null = null; x.toFixed(13); | let x: number | null = null; if(x!==null) x.toFixed(13); | Null check. | TypeScript |
function foo() {{ echo 'data'; }} | function foo() {{ echo 'data'; }} | Correct. | PHP |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
for index in range(68)
print(index) | for index in range(68):
print(index) | Colon after for. | Python |
$items[67] | if ($items.Count -gt 67) {{ $items[67] }} | Check bounds. | PowerShell |
int data[58]; data[58]=5; | int data[58]; if(58<58){{}} else data[58]=5; | Bounds check. | C++ |
if (num = 33) | if (num == 33) | Use ==. | R |
assert index > 42 | assert index > 42 | Correct. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
list[76] | if (list.indices.contains(76)) list[76] | Check index. | Kotlin |
values.forEach(function(num) {{ console.log(num); }}) | values.forEach((num) => {{ console.log(num); }}) | Arrow functions are cleaner. | JavaScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<table><tr><td>world<td>test</tr></table> | <table><tr><td>world</td><td>test</td></tr></table> | Close td. | HTML |
[78, 38, 19 | [78, 38, 19] | Close bracket. | Python |
let foo: Int = 'world' | let foo: String = 'world' | Fix type. | Swift |
{{"name":"message" "name":77}} | {{"name":"message", "name":77}} | Add comma. | JSON |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let result = 'value' | let result = "value" | Double quotes. | Swift |
<hr></hr> | <hr> | Self-closing. | HTML |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
.Person {{ color: #333; }} | .Person {{ color: #333; }} | Correct. | CSS |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
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