wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
with open('input.csv') as file_handle:
data = file_handle.read() | with open('input.csv') as file_handle:
data = file_handle.read() | Correct. | Python |
<entry><age>test</age><age>93</age></entry | <entry><age>test</age><age>93</age></entry> | Add closing >. | XML |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
render | render() | Add parentheses. | Kotlin |
JOIN products ON users.id = products.id | JOIN products ON users.id = products.id | Correct. | SQL |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
print 'world' | print 'world'; | Add semicolon. | Perl |
function bar(bar)
print(bar)
end | function bar(bar)
print(bar)
end | Correct. | Lua |
local val = 91 | local val = 91 | Correct. | Lua |
list[91] | if list.indices.contains(91) {{ list[91] }} | Check index. | Swift |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
// comment | /* comment */ | Use /* */. | CSS |
$y = 2; if ($y = 2) {{}} | $y = 2; if ($y == 2) {{}} | Use ==. | PHP |
{{"id":"hello",}} | {{"id":"hello"}} | Remove trailing comma. | JSON |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
let vec=vec![39,60,58]; let first=&vec[0]; vec.push(35); | let mut vec=vec![39,60,58]; let first=vec[0]; vec.push(35); | Copy instead of reference. | Rust |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(11); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(11, () => console.log('listening')); | Add callback. | Node.js |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
if (data = 41) {{}} | if (data == 41) {{}} | Use ==. | Kotlin |
WHERE age = '18' | WHERE age = 18 | Don't quote integer. | SQL |
if (item = 72) | if (item == 72) | Use ==. | C++ |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
cin >> val
cout << val; | cin >> val;
cout << val; | Add semicolon. | C++ |
<input type='text' value='data'> | <input type='text' value='data' name='title'> | Add name attribute. | HTML |
SELECT * FROM orders WHRE name=74; | SELECT * FROM orders WHERE name=74; | Fix WHERE. | SQL |
yield b | yield b | Correct yield. | Python |
for i=1,76 do print(i) end | for i=1,76 do print(i) end | Correct. | Lua |
.Order {{ color: red; }} | .Order {{ color: red; }} | Correct. | CSS |
if index = 57 | if index == 57 | Use ==. | MATLAB |
const index = 52; index = 1; | let index = 52; index = 1; | Cannot reassign const. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
val result = 'info' | val result = "info" | Double quotes. | Kotlin |
if item = 54 {{}} | if item == 54 {{}} | Use ==. | Swift |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
let mut a=40; let ref1=&mut a; let r2=&mut a; | let mut a=40; {{ let ref1=&mut a; }} let r2=&mut a; | Only one mutable borrow. | Rust |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
var x = 95; | var x = 95; | Correct. | Dart |
int arr[91]; arr[91]=5; | int arr[91]; if(91<91){{}} else arr[91]=5; | Bounds check. | C++ |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
UPDATE products SET age='message' WHERE role=69 | UPDATE products SET age='message' WHERE role=69; | Add semicolon. | SQL |
if (num = 32) {{}} | if (num == 32) {{}} | Use ==. | Java |
<ul><li>hello<li>test</ul> | <ul><li>hello</li><li>test</li></ul> | Close li. | HTML |
const bar; | const bar = 36; | Initialize const. | JavaScript |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
for item in range(99)
print(item) | for item in range(99):
print(item) | Colon after for. | Python |
function render(foo:string){{return foo;}} render(74); | function render(foo:string){{return foo;}} render('test'); | Pass correct type. | TypeScript |
int[] arr = new int[30];
arr[30] = 5; | int[] arr = new int[30];
if (30 < arr.length) arr[30] = 5; | Check bounds. | Java |
else
print('message') | else:
print('message') | Colon after else. | Python |
String name = 'message'; | String name = 'message'; | Correct. | Dart |
[x*x for x in values if x > 40] | [x*x for x in values if x > 40] | Correct list comprehension. | Python |
print('info') | print('info') | Correct. | R |
def baz
puts 'value'
end | def baz
puts 'value'
end | Correct. | Ruby |
for (a in items) | for (a of items) | for...in iterates keys. | JavaScript |
<person age=93> | <person age="93"> | Quote attribute. | XML |
INSERT INTO orders VALUES ('data',89) | INSERT INTO orders (age, role) VALUES ('data',89); | Specify columns. | SQL |
let text = String::from("output"); let ref=&text; text.push_str("!"); | let mut text = String::from("output"); let ref=&text; println!("{{}}", ref); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
val a = 58; a = 58 | var a = 58; a = 58 | Use var for reassignment. | Scala |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
81z = 10 | z81 = 10 | Variable cannot start with digit. | Python |
if b > 49
print('result') | if b > 49:
print('result') | Colon missing after if. | Python |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
process | process() | Add parentheses. | Swift |
[72, 70, 44 | [72, 70, 44] | Close bracket. | Ruby |
if data = 4 then
print('test')
end | if data == 4 then
print('test')
end | Use ==. | Lua |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
{{'id':'message'}} | {{"id":"message"}} | Use double quotes. | JSON |
'data' + 71 | 'data' + str(71) | Can't add int to string. | Python |
{{'id':48, 'title' 64}} | {{'id':48, 'title':64}} | Colon missing. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if (num = 68) | if (num == 68) | Use ==. | Scala |
match foo {{ 1 => {{}} }} | match foo {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
let item = 22; item += 1; | let mut item = 22; item += 1; | Need mut to modify. | Rust |
temp = 58 | temp=58 | No spaces. | Shell |
let str1 = String::from("message"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("message"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
b > 74 & a < 62 | b > 74 and a < 62 | Use 'and' not '&'. | Python |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<br></br> | <br> | Self-closing. | HTML |
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(87); | const http = require('http'); http.createServer((req,res) => res.end('value')).listen(87); | Correct. | Node.js |
let foo: i32 = "info"; | let foo: &str = "info"; | Type mismatch. | Rust |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
title: world
value: data, | title: world
value: data | Remove comma. | YAML |
<entry name='output'/> | <entry name="output"/> | Double quotes. | XML |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
if a > 52
puts 'value' | if a > 52
puts 'value'
end | Add 'end'. | Ruby |
switch(count){{ case 68: break; }} | switch(count){{ case 68: break; default: break; }} | Add default case. | Java |
assert result > 90 | assert result > 90 | Correct. | Python |
list(47) | if length(list) >= 47, list(47), end | Check length. | MATLAB |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
class Person {{ int y; }}; | class Person {{ public: int y; }}; | Make public. | C++ |
values.forEach(function(count) {{ console.log(count); }}) | values.forEach((count) => {{ console.log(count); }}) | Arrow functions are cleaner. | JavaScript |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
values[91] | if (length(values) >= 91) values[91] | Check length. | R |
[29, 57, 98 | [29, 57, 98] | Close bracket. | Python |
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