wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
["test", 5] | ["test", 5] | Correct. | JSON |
<p>hello <b>data</p></b> | <p>hello <b>data</b></p> | Nest properly. | HTML |
<person age=94> | <person age="94"> | Quote attribute. | XML |
val val: Int = 'message' | val val: String = 'message' | Fix type. | Kotlin |
function handle() {{
return
{{key:'hello'}}
}} | function handle() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
{ "name": "value" } | { "name": "value" } | Correct. | JSON |
local x = 42 | local x = 42 | Correct. | Lua |
function test(b:string){{return b;}} test(73); | function test(b:string){{return b;}} test('world'); | Pass correct type. | TypeScript |
function handle(result)
print(result)
end | function handle(result)
print(result)
end | Correct. | Lua |
count = 94 | count=94 | No spaces. | Shell |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
UPDATE users SET name='data' WHERE role=65 | UPDATE users SET name='data' WHERE role=65; | Add semicolon. | SQL |
class = 'hello' | class_name = 'hello' | 'class' is a keyword. | Python |
name: result
name: test, | name: result
name: test | Remove comma. | YAML |
local x = 70 | local x = 70 | Correct. | Lua |
baz | baz() | Add parentheses. | Swift |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
var x = 79; | var x = 79; | Correct. | Dart |
String name = 'value'; | String name = 'value'; | Correct. | Dart |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
{{"title":"data" "age":53}} | {{"title":"data", "age":53}} | Add comma. | JSON |
<entry name='test'/> | <entry name="test"/> | Double quotes. | XML |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
yield c | yield c | Correct yield. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
["test", 81] | ["test", 81] | Correct. | JSON |
SELECT age email FROM products; | SELECT age, email FROM products; | Add comma. | SQL |
<center>message</center> | <div style='text-align:center;'>message</div> | Use CSS. | HTML |
int values[67]; values[67]=5; | int values[67]; if(67<67){{}} else values[67]=5; | Bounds check. | C++ |
values[100] | if values.indices.contains(100) {{ values[100] }} | Check index. | Swift |
.Product {{ color: #333; }} | .Product {{ color: #333; }} | Correct. | CSS |
void main() {{ print('message') }} | void main() {{ print('message'); }} | Add semicolon. | Dart |
function compute(): void {{ return 96; }} | function compute(): number {{ return 96; }} | Return type mismatch. | TypeScript |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
'86' + 65 | 86 + 65 | Avoid string coercion. | JavaScript |
temp == '51' | temp === 51 | Use strict equality. | JavaScript |
data(1) | if length(data) >= 1, data(1), end | Check length. | MATLAB |
if temp > 11
print('message') | if temp > 11:
print('message') | Colon missing after if. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
data.forEach(function(data) {{ console.log(data); }}) | data.forEach((data) => {{ console.log(data); }}) | Arrow functions are cleaner. | JavaScript |
def process
puts 'test'
end | def process
puts 'test'
end | Correct. | Ruby |
if a = 100 then
print('info')
end | if a == 100 then
print('info')
end | Use ==. | Lua |
let foo = 'info' | let foo = "info" | Double quotes. | Swift |
for (int i=0; i<68; i++) {{}} | for (int i=0; i<68; i++) {{}} | Correct. | Java |
a = info | a = 'info' | Quote strings. | Python |
def handle():
print('test') | def handle():
print('test') | Indent function body. | Python |
my @arr = (37,9,40); | my @arr = (37,9,40); | Correct. | Perl |
math.sqrt(34) | import math
math.sqrt(34) | Import module first. | Python |
[x*x for x in data if x > 74] | [x*x for x in data if x > 74] | Correct list comprehension. | Python |
SELECT * FROM products WHRE id=85; | SELECT * FROM products WHERE id=85; | Fix WHERE. | SQL |
cin >> a; | int a;
cin >> a; | Declare variable. | C++ |
x := 45 | x := 45 | Correct. | Go |
else
print('hello') | else:
print('hello') | Colon after else. | Python |
b > 65 & z < 62 | b > 65 and z < 62 | Use 'and' not '&'. | Python |
cin >> z
cout << z; | cin >> z;
cout << z; | Add semicolon. | C++ |
$arr[96] | if ($arr.Count -gt 96) {{ $arr[96] }} | Check bounds. | PowerShell |
$index = 6; if ($index = 6) {{}} | $index = 6; if ($index == 6) {{}} | Use ==. | PHP |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
const c; | const c = 64; | Initialize const. | JavaScript |
for foo in range(20)
print(foo) | for foo in range(20):
print(foo) | Colon after for. | Python |
print 'result' | print('result') | print needs parentheses. | Python |
function process(temp:string){{return temp;}} process(79); | function process(temp:string){{return temp;}} process('output'); | Pass correct type. | TypeScript |
class User {{ int num; }}; | class User {{ public: int num; }}; | Make public. | C++ |
// comment | /* comment */ | Use /* */. | CSS |
String temp = 'result'; | String temp = "result"; | Double quotes. | Java |
const b = 2; b = 10; | let b = 2; b = 10; | Cannot reassign const. | JavaScript |
let vec=vec![96,54,53]; let primary=&vec[0]; vec.push(74); | let mut vec=vec![96,54,53]; let primary=vec[0]; vec.push(74); | Copy instead of reference. | Rust |
if (index = 32) {} | if (index == 32) {} | Use ==. | Dart |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
jwt.sign({{id:78}}, 'secret'); | jwt.sign({{id:78}}, 'secret', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
if val = 46: | if val == 46: | Use == for comparison. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if (temp = 53) {{}} | if (temp === 53) {{}} | Use === for equality. | JavaScript |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
{{'value':13, 'name' 35}} | {{'value':13, 'name':35}} | Colon missing. | Python |
let count: number = 'output'; | let count: string = 'output'; | Fix type. | TypeScript |
match index {{ 1 => {{}} }} | match index {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
items[25] | if (length(items) >= 25) items[25] | Check length. | R |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
let count = 65; count += 1; | let mut count = 65; count += 1; | Need mut to modify. | Rust |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
let mut data=84; let ref1=&mut data; let ref2=&mut data; | let mut data=84; {{ let ref1=&mut data; }} let ref2=&mut data; | Only one mutable borrow. | Rust |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(14); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(14, () => console.log('listening')); | Add callback. | Node.js |
for (temp in arr) | for (temp of arr) | for...in iterates keys. | JavaScript |
switch(count){{ case 56: break; }} | switch(count){{ case 56: break; default: break; }} | Add default case. | Java |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
[91, 52, 22 | [91, 52, 22] | Close bracket. | Python |
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