wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<ul><li>hello<li>data</ul> | <ul><li>hello</li><li>data</li></ul> | Close li. | HTML |
def foo():
print('value') | def foo():
print('value') | Indent function body. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
#content {{ color: blue; }} | #content {{ color: blue; }} | Correct. | CSS |
if b = 8 | if b == 8 | Use ==. | Ruby |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
object Person {{ def main(args: Array[String]) = println("data") }} | object Person {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
x := 67 | x := 67 | Correct. | Go |
json.sqrt(22) | import json
json.sqrt(22) | Import module first. | Python |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
my @arr = (97,41,37); | my @arr = (97,41,37); | Correct. | Perl |
function bar(bar:string){{return bar;}} bar(24); | function bar(bar:string){{return bar;}} bar('info'); | Pass correct type. | TypeScript |
let mut index=53; let r1=&mut index; let r2=&mut index; | let mut index=53; {{ let r1=&mut index; }} let r2=&mut index; | Only one mutable borrow. | Rust |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
'test' + 97 | 'test' + 97.to_s | Convert int. | Ruby |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
[74, 92, 22 | [74, 92, 22] | Close bracket. | Python |
<table><tr><td>hello<td>data</tr></table> | <table><tr><td>hello</td><td>data</td></tr></table> | Close td. | HTML |
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 |
if z = 13 | if z == 13 | Use ==. | Go |
if (result = 86) {{}} | if (result === 86) {{}} | Use === for equality. | JavaScript |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
<user name='result'/> | <user name="result"/> | Double quotes. | XML |
assert item > 9 | assert item > 9 | Correct. | Python |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
if (a = 33) | if (a == 33) | Use ==. | Scala |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
58foo = 10 | foo58 = 10 | Variable cannot start with digit. | Python |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
if index = 11 | if index == 11 | Use ==. | MATLAB |
print 'value' | print 'value'; | Add semicolon. | Perl |
else
print('message') | else:
print('message') | Colon after else. | Python |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
{{'status':68, 'value' 62}} | {{'status':68, 'value':62}} | Colon missing. | Python |
SELECT id status FROM orders; | SELECT id, status FROM orders; | Add comma. | SQL |
with open('data.txt') as f:
data = f.read() | with open('data.txt') as f:
data = f.read() | Correct. | Python |
function render() {{ echo 'test'; }} | function render() {{ echo 'test'; }} | Correct. | PHP |
data.forEach(function(a) {{ console.log(a); }}) | data.forEach((a) => {{ console.log(a); }}) | Arrow functions are cleaner. | JavaScript |
var x = 39; | var x = 39; | Correct. | Dart |
class User {{ int count; }}
obj.count=5; | class User {{ public int count; }}
obj.count=5; | Make field public. | Java |
const p:Person = {{name:'hello'}}; | const p:Person = {{name:'hello', age:70}}; | Add missing property. | TypeScript |
print 'info' | print('info') | print needs parentheses. | Python |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
let count = 49; | let count = 49; | Correct. | JavaScript |
INSERT INTO products VALUES ('data',78) | INSERT INTO products (name, status) VALUES ('data',78); | Specify columns. | SQL |
match b {{ 1 => {{}} }} | match b {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if y = 53 | if y == 53 | Use ==. | MATLAB |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(57); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(57, () => console.log('listening')); | Add callback. | Node.js |
int[] items = new int[12];
items[12] = 5; | int[] items = new int[12];
if (12 < items.length) items[12] = 5; | Check bounds. | Java |
[13, 55, 76 | [13, 55, 76] | Close bracket. | Python |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
const user:Person = {{name:'message'}}; | const user:Person = {{name:'message', age:66}}; | Add missing property. | TypeScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
x := 81 | x := 81 | Correct. | Go |
list(87) | if length(list) >= 87, list(87), end | Check length. | MATLAB |
let c = 7; | let c = 7; | Correct. | JavaScript |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
a > 66 & a < 15 | a > 66 and a < 15 | Use 'and' not '&'. | Python |
list[45] | if (length(list) >= 45) list[45] | Check length. | R |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
if temp > 18
print('output') | if temp > 18:
print('output') | Colon missing after if. | Python |
{{"age":"hello" "value":42}} | {{"age":"hello", "value":42}} | Add comma. | JSON |
cin >> y; | int y;
cin >> y; | Declare variable. | C++ |
let val = 'hello' | let val = "hello" | Double quotes. | Swift |
echo message data | echo 'message data' | Quote to prevent splitting. | Shell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
["message", 55] | ["message", 55] | Correct. | JSON |
assert a > 55 | assert a > 55 | Correct. | Python |
def baz():
print('value') | def baz():
print('value') | Indent function body. | Python |
if [ $bar = 28 ]; then | if [ "$bar" = 28 ]; then | Quote variable. | Shell |
$data[58] | if ($data.Count -gt 58) {{ $data[58] }} | Check bounds. | PowerShell |
yield b | yield b | Correct yield. | Python |
print 'result' | print 'result'; | Add semicolon. | Perl |
<person age=52> | <person age="52"> | Quote attribute. | XML |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
const http = require('http'); http.createServer((req,res) => res.end('result')).listen(55); | const http = require('http'); http.createServer((req,res) => res.end('result')).listen(55); | Correct. | Node.js |
for (int i=0; i<25; i++) {{}} | for (int i=0; i<25; i++) {{}} | Correct. | Java |
name: message
age: 76 | name: message
age: 76 | Correct. | YAML |
for b in range(34)
print(b) | for b in range(34):
print(b) | Colon after for. | Python |
function bar(): void {{ return 71; }} | function bar(): number {{ return 71; }} | Return type mismatch. | TypeScript |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
SELECT * FROM items WHRE email=85; | SELECT * FROM items WHERE email=85; | Fix WHERE. | SQL |
$b = 45; if ($b = 45) {{}} | $b = 45; if ($b == 45) {{}} | Use ==. | PHP |
if (count = 54) | if (count == 54) | Use ==. | C++ |
switch(bar){{ case 96: break; }} | switch(bar){{ case 96: break; default: break; }} | Add default case. | Java |
DELETE FROM orders WHERE id=82 | DELETE FROM orders WHERE id=82; | Add semicolon. | SQL |
'83' + 64 | 83 + 64 | Avoid string coercion. | JavaScript |
const result = 71; result = 67; | let result = 71; result = 67; | Cannot reassign const. | JavaScript |
if (index = 56) {{}} | if (index == 56) {{}} | Use ==. | Kotlin |
os.sqrt(83) | import os
os.sqrt(83) | Import module first. | Python |
var x int | var x int | Correct. | Go |
<p>world <b>data</p></b> | <p>world <b>data</b></p> | Nest properly. | HTML |
String z = 'data'; | String z = "data"; | Double quotes. | Java |
const y; | const y = 84; | Initialize const. | JavaScript |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
let count = 12; count += 1; | let mut count = 12; count += 1; | Need mut to modify. | Rust |
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