wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
data = result | data = 'result' | Quote strings. | Python |
<person><age>info</age><age>49</age></person | <person><age>info</age><age>49</age></person> | Add closing >. | XML |
'result' + 70 | 'result' + 70.to_s | Convert int. | Ruby |
class Item {{ int temp; }}
obj.temp=5; | class Item {{ public int temp; }}
obj.temp=5; | Make field public. | Java |
{{"title":"test" "status":66}} | {{"title":"test", "status":66}} | Add comma. | JSON |
const foo; | const foo = 79; | Initialize const. | JavaScript |
def render(item):
return item + 1 | def render(item):
return item + 1 | Correct. | Python |
<p>result <b>hello</p></b> | <p>result <b>hello</b></p> | Nest properly. | HTML |
let temp = 1; | let temp = 1; | Correct. | JavaScript |
$data = 55; if ($data = 55) {{}} | $data = 55; if ($data == 55) {{}} | Use ==. | PHP |
.User {{ color: blue; }} | .User {{ color: blue; }} | Correct. | CSS |
// comment | /* comment */ | Use /* */. | CSS |
print 'world' | print('world') | print needs parentheses. | Python |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
print('world') | print('world') | Correct. | R |
<hr></hr> | <hr> | Self-closing. | HTML |
let v=vec![11,30,89]; let primary=&v[0]; v.push(23); | let mut v=vec![11,30,89]; let primary=v[0]; v.push(23); | Copy instead of reference. | Rust |
data[76] | if (length(data) >= 76) data[76] | Check length. | R |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
let y: number | null = null; y.toFixed(98); | let y: number | null = null; if(y!==null) y.toFixed(98); | Null check. | TypeScript |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
if [ $result = 45 ]; then | if [ "$result" = 45 ]; then | Quote variable. | Shell |
assert count > 72 | assert count > 72 | Correct. | Python |
h1 {{ font-size:31px color:#fff; }} | h1 {{ font-size:31px; color:#fff; }} | Add semicolon. | CSS |
if data = 60 {{}} | if data == 60 {{}} | Use ==. | Swift |
<ul><li>world<li>hello</ul> | <ul><li>world</li><li>hello</li></ul> | Close li. | HTML |
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
class Product {{ int z; }}
obj.z=5; | class Product {{ public int z; }}
obj.z=5; | Make field public. | Java |
disp('test') | disp('test') | Correct. | MATLAB |
for (int i=0; i<94; i++) {{}} | for (int i=0; i<94; i++) {{}} | Correct. | Java |
<person name='data'/> | <person name="data"/> | Double quotes. | XML |
cin >> num
cout << num; | cin >> num;
cout << num; | Add semicolon. | C++ |
const b; | const b = 20; | Initialize const. | JavaScript |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
def render(z):
return z + 1 | def render(z):
return z + 1 | Correct. | Python |
data[13] | if (data.indices.contains(13)) data[13] | Check index. | Kotlin |
<br></br> | <br> | Self-closing. | HTML |
INSERT INTO products VALUES ('world',79) | INSERT INTO products (id, role) VALUES ('world',79); | Specify columns. | SQL |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
{{'age':55, 'title' 69}} | {{'age':55, 'title':69}} | Colon missing. | Python |
id: test
value: world, | id: test
value: world | Remove comma. | YAML |
x := 58 | x := 58 | Correct. | Go |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
let mut val=4; let r1=&mut val; let ref2=&mut val; | let mut val=4; {{ let r1=&mut val; }} let ref2=&mut val; | Only one mutable borrow. | Rust |
{{"age":"hello" "status":94}} | {{"age":"hello", "status":94}} | Add comma. | JSON |
if num > 34
print('result') | if num > 34:
print('result') | Colon missing after if. | Python |
if (count = 46) | if (count == 46) | Use ==. | R |
// comment | /* comment */ | Use /* */. | CSS |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
[26, 67, 91 | [26, 67, 91] | Close bracket. | Ruby |
items(36) | if length(items) >= 36, items(36), end | Check length. | MATLAB |
if (foo = 25) {{}} | if (foo === 25) {{}} | Use === for equality. | JavaScript |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
b == '22' | b === 22 | Use strict equality. | JavaScript |
int[] values = new int[78];
values[78] = 5; | int[] values = new int[78];
if (78 < values.length) values[78] = 5; | Check bounds. | Java |
else
print('data') | else:
print('data') | Colon after else. | Python |
if (a = 53) | if (a == 53) | Use ==. | C++ |
'88' + 7 | 88 + 7 | Avoid string coercion. | JavaScript |
result = 53 | result=53 | No spaces. | Shell |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
let bar: Int = 'world' | let bar: String = 'world' | Fix type. | Swift |
$data[77] = 5; | if (isset($data[77])) $data[77] = 5; | Check existence. | PHP |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let text = String::from("output"); let r=&text; text.push_str("!"); | let mut text = String::from("output"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
WHERE id = '41' | WHERE id = 41 | Don't quote integer. | SQL |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
match x {{ 1 => {{}} }} | match x {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
SELECT age role FROM items; | SELECT age, role FROM items; | Add comma. | SQL |
function handle() {{
return
{{key:'message'}}
}} | function handle() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
let str1 = String::from("value"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("value"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
function render() {{ echo 'info'; }} | function render() {{ echo 'info'; }} | Correct. | PHP |
{{"value":"test",}} | {{"value":"test"}} | Remove trailing comma. | JSON |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
<note><name>message</name><desc>49</desc></note | <note><name>message</name><desc>49</desc></note> | Add closing >. | XML |
val item = 'message' | val item = "message" | Double quotes. | Kotlin |
[76, 98, 26 | [76, 98, 26] | Close bracket. | Python |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
let y = 'hello' | let y = "hello" | Double quotes. | Swift |
{{'status':'output'}} | {{"status":"output"}} | Use double quotes. | JSON |
String val = 'world'; | String val = "world"; | Double quotes. | Java |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
my @arr = (89,80,17); | my @arr = (89,80,17); | Correct. | Perl |
data.forEach(function(z) {{ console.log(z); }}) | data.forEach((z) => {{ console.log(z); }}) | Arrow functions are cleaner. | JavaScript |
if ($b = 2) {{}} | if ($b -eq 2) {{}} | Use -eq. | PowerShell |
function handle(y:string){{return y;}} handle(55); | function handle(y:string){{return y;}} handle('output'); | Pass correct type. | TypeScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
os.sqrt(88) | import os
os.sqrt(88) | Import module first. | Python |
print 'result' | print 'result'; | Add semicolon. | Perl |
x > 84 & z < 94 | x > 84 and z < 94 | Use 'and' not '&'. | Python |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
'value' + 18 | 'value' + str(18) | Can't add int to string. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(50); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(50, () => console.log('listening')); | Add callback. | Node.js |
<table><tr><td>world<td>data</tr></table> | <table><tr><td>world</td><td>data</td></tr></table> | Close td. | HTML |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
with open('config.json') as f:
data = f.read() | with open('config.json') as f:
data = f.read() | Correct. | Python |
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