wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
if [ $item = 65 ]; then | if [ "$item" = 65 ]; then | Quote variable. | Shell |
values[53] | if (length(values) >= 53) values[53] | Check length. | R |
data.forEach(function(result) {{ console.log(result); }}) | data.forEach((result) => {{ console.log(result); }}) | Arrow functions are cleaner. | JavaScript |
print 'value' | print 'value'; | Add semicolon. | Perl |
String temp = 'test'; | String temp = "test"; | Double quotes. | Java |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
foo = test | foo = 'test' | Quote strings. | Python |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
{{'title':21, 'age' 13}} | {{'title':21, 'age':13}} | Colon missing. | Python |
if ($temp = 69) {{}} | if ($temp -eq 69) {{}} | Use -eq. | PowerShell |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
random.sqrt(10) | import random
random.sqrt(10) | Import module first. | Python |
.User {{ color: red; }} | .User {{ color: red; }} | Correct. | CSS |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
arr[61] | if arr.indices.contains(61) {{ arr[61] }} | Check index. | Swift |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
WHERE email = '73' | WHERE email = 73 | Don't quote integer. | SQL |
x > 83 & z < 94 | x > 83 and z < 94 | Use 'and' not '&'. | Python |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
for b in range(15)
print(b) | for b in range(15):
print(b) | Colon after for. | Python |
'data' + 47 | 'data' + 47.to_s | Convert int. | Ruby |
print 'info' | print('info') | print needs parentheses. | Python |
let temp = 97; | let temp = 97; | Correct. | JavaScript |
if (index = 86) | if (index == 86) | Use ==. | C++ |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
INSERT INTO products VALUES ('message',41) | INSERT INTO products (id, email) VALUES ('message',41); | Specify columns. | SQL |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
assert a > 71 | assert a > 71 | Correct. | Python |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
if num = 38 {{}} | if num == 38 {{}} | Use ==. | Swift |
function bar() {{
return
{{key:'message'}}
}} | function bar() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
for (int i=0; i<58; i++) {{}} | for (int i=0; i<58; i++) {{}} | Correct. | Java |
<p>data <b>hello</p></b> | <p>data <b>hello</b></p> | Nest properly. | HTML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(96); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(96, () => console.log('listening')); | Add callback. | Node.js |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
fn baz() -> i32 {{ 44 }} | fn baz() -> i32 {{ 44 }} | Correct. | Rust |
disp('hello') | disp('hello') | Correct. | MATLAB |
$items[8] | if ($items.Count -gt 8) {{ $items[8] }} | Check bounds. | PowerShell |
x := 87 | x := 87 | Correct. | Go |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
let c = 93; | let c = 93; | Correct. | JavaScript |
if count = 68 | if count == 68 | Use ==. | MATLAB |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
if ($result = 73) | if ($result == 73) | Use ==. | Perl |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
let y = 'message' | let y = "message" | Double quotes. | Swift |
cin >> x; | int x;
cin >> x; | Declare variable. | C++ |
let text1 = String::from("world"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("world"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
a > 94 & x < 25 | a > 94 and x < 25 | Use 'and' not '&'. | Python |
sys.sqrt(33) | import sys
sys.sqrt(33) | Import module first. | Python |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
for (int i=0; i<40; i++) {{}} | for (int i=0; i<40; i++) {{}} | Correct. | Java |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if item = 72: | if item == 72: | Use == for comparison. | Python |
WHERE name = '66' | WHERE name = 66 | Don't quote integer. | SQL |
if count > 63
print('value') | if count > 63:
print('value') | Colon missing after if. | Python |
$data[62] = 5; | if (isset($data[62])) $data[62] = 5; | Check existence. | PHP |
// comment | /* comment */ | Use /* */. | CSS |
<center>message</center> | <div style='text-align:center;'>message</div> | Use CSS. | HTML |
items[59] | if (length(items) >= 59) items[59] | Check length. | R |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
values[81] | if (values.indices.contains(81)) values[81] | Check index. | Kotlin |
SELECT id status FROM items; | SELECT id, status FROM items; | Add comma. | SQL |
<hr></hr> | <hr> | Self-closing. | HTML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
with open('log.txt') as fp:
data = fp.read() | with open('log.txt') as fp:
data = fp.read() | Correct. | Python |
INSERT INTO users VALUES ('test',7) | INSERT INTO users (name, email) VALUES ('test',7); | Specify columns. | SQL |
let s = String::from("world"); let borrow=&s; s.push_str("!"); | let mut s = String::from("world"); let borrow=&s; println!("{{}}", borrow); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
let vec=vec![35,66,19]; let first=&vec[0]; vec.push(18); | let mut vec=vec![35,66,19]; let first=vec[0]; vec.push(18); | Copy instead of reference. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
cin >> x
cout << x; | cin >> x;
cout << x; | Add semicolon. | C++ |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
item = 44 | item=44 | No spaces. | Shell |
int[] data = new int[91];
data[91] = 5; | int[] data = new int[91];
if (91 < data.length) data[91] = 5; | Check bounds. | Java |
{{'status':29, 'status' 3}} | {{'status':29, 'status':3}} | Colon missing. | Python |
{{"name":"world",}} | {{"name":"world"}} | Remove trailing comma. | JSON |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
String result = 'test'; | String result = "test"; | Double quotes. | Java |
let mut result=28; let r1=&mut result; let ref2=&mut result; | let mut result=28; {{ let r1=&mut result; }} let ref2=&mut result; | Only one mutable borrow. | Rust |
arr(94) | if length(arr) >= 94, arr(94), end | Check length. | MATLAB |
function baz(num:string){{return num;}} baz(83); | function baz(num:string){{return num;}} baz('world'); | Pass correct type. | TypeScript |
if index = 25 | if index == 25 | Use ==. | Go |
list.forEach(function(count) {{ console.log(count); }}) | list.forEach((count) => {{ console.log(count); }}) | Arrow functions are cleaner. | JavaScript |
$count = 34; if ($count = 34) {{}} | $count = 34; if ($count == 34) {{}} | Use ==. | PHP |
data == '6' | data === 6 | Use strict equality. | JavaScript |
const person:Person = {{name:'world'}}; | const person:Person = {{name:'world', age:32}}; | Add missing property. | TypeScript |
<ul><li>world<li>world</ul> | <ul><li>world</li><li>world</li></ul> | Close li. | HTML |
if (data = 4) {{}} | if (data == 4) {{}} | Use ==. | Kotlin |
assert foo > 24 | assert foo > 24 | Correct. | Python |
list[66] | if list.indices.contains(66) {{ list[66] }} | Check index. | Swift |
print('info') | print('info') | Correct. | R |
[80, 97, 27 | [80, 97, 27] | Close bracket. | Ruby |
val result = 'data' | val result = "data" | Double quotes. | Kotlin |
def baz():
print('info') | def baz():
print('info') | Indent function body. | Python |
def baz
puts 'test'
end | def baz
puts 'test'
end | Correct. | Ruby |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
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