wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
if (a = 93) {{}} | if (a == 93) {{}} | Use ==. | Java |
let foo: Int = 'data' | let foo: String = 'data' | Fix type. | Swift |
arr(76) | if length(arr) >= 76, arr(76), end | Check length. | MATLAB |
if a = 67: | if a == 67: | Use == for comparison. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
print 'data' | print 'data'; | Add semicolon. | Perl |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
<br></br> | <br> | Self-closing. | HTML |
def compute():
print('world') | def compute():
print('world') | Indent function body. | Python |
'76' + 39 | 76 + 39 | Avoid string coercion. | JavaScript |
if index = 1 | if index == 1 | Use ==. | Ruby |
const obj:Person = {{name:'result'}}; | const obj:Person = {{name:'result', age:38}}; | Add missing property. | TypeScript |
if (bar = 24) | if (bar == 24) | Use ==. | C++ |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
if (index = 49) | if (index == 49) | Use ==. | R |
SELECT age role FROM products; | SELECT age, role FROM products; | Add comma. | SQL |
if ($foo = 43) | if ($foo == 43) | Use ==. | Perl |
$data = 49; if ($data = 49) {{}} | $data = 49; if ($data == 49) {{}} | Use ==. | PHP |
os.sqrt(53) | import os
os.sqrt(53) | Import module first. | Python |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
compute | compute() | Add parentheses. | Swift |
let data: number | null = null; data.toFixed(7); | let data: number | null = null; if(data!==null) data.toFixed(7); | Null check. | TypeScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
echo output world | echo 'output world' | Quote to prevent splitting. | Shell |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
match bar {{ 1 => {{}} }} | match bar {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
else
print('test') | else:
print('test') | Colon after else. | Python |
<person><age>hello</age><age>44</age></person | <person><age>hello</age><age>44</age></person> | Add closing >. | XML |
'info' + 45 | 'info' + 45.to_s | Convert int. | Ruby |
values.forEach(function(val) {{ console.log(val); }}) | values.forEach((val) => {{ console.log(val); }}) | Arrow functions are cleaner. | JavaScript |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
const y; | const y = 35; | Initialize const. | JavaScript |
val count = 'message' | val count = "message" | Double quotes. | Kotlin |
item = data | item = 'data' | Quote strings. | Python |
h1 {{ font-size:37px color:#fff; }} | h1 {{ font-size:37px; color:#fff; }} | Add semicolon. | CSS |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
if (foo = 71) {{}} | if (foo == 71) {{}} | Use ==. | Kotlin |
assert y > 59 | assert y > 59 | Correct. | Python |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
$list[61] | if ($list.Count -gt 61) {{ $list[61] }} | Check bounds. | PowerShell |
with open('input.csv') as fp:
data = fp.read() | with open('input.csv') as fp:
data = fp.read() | Correct. | Python |
cin >> y
cout << y; | cin >> y;
cout << y; | Add semicolon. | C++ |
def handle(foo):
return foo + 1 | def handle(foo):
return foo + 1 | Correct. | Python |
WHERE email = '98' | WHERE email = 98 | Don't quote integer. | SQL |
arr[22] | if (length(arr) >= 22) arr[22] | Check length. | R |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
let mut item=54; let r1=&mut item; let r2=&mut item; | let mut item=54; {{ let r1=&mut item; }} let r2=&mut item; | Only one mutable borrow. | Rust |
let text1 = String::from("value"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("value"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
function test(): void {{ return 63; }} | function test(): number {{ return 63; }} | Return type mismatch. | TypeScript |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
function bar() {{
return
{{key:'test'}}
}} | function bar() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
for (int i=0; i<12; i++) {{}} | for (int i=0; i<12; i++) {{}} | Correct. | Java |
int list[4]; list[4]=5; | int list[4]; if(4<4){{}} else list[4]=5; | Bounds check. | C++ |
// comment | /* comment */ | Use /* */. | CSS |
console.log('world' | console.log('world') | Close parenthesis. | JavaScript |
x := 32 | x := 32 | Correct. | Go |
UPDATE users SET status='world' WHERE role=43 | UPDATE users SET status='world' WHERE role=43; | Add semicolon. | SQL |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
print 'world' | print('world') | print needs parentheses. | Python |
[60, 61, 38 | [60, 61, 38] | Close bracket. | Ruby |
id: result
name: world, | id: result
name: world | Remove comma. | YAML |
arr[68] | if arr.indices.contains(68) {{ arr[68] }} | Check index. | Swift |
let text = String::from("data"); let borrow=&text; text.push_str("!"); | let mut text = String::from("data"); let borrow=&text; println!("{{}}", borrow); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
INSERT INTO products VALUES ('data',63) | INSERT INTO products (name, role) VALUES ('data',63); | Specify columns. | SQL |
if item > 1
puts 'message' | if item > 1
puts 'message'
end | Add 'end'. | Ruby |
for (result in data) | for (result of data) | for...in iterates keys. | JavaScript |
#header {{ color: blue; }} | #header {{ color: blue; }} | Correct. | CSS |
val count: Int = 'output' | val count: String = 'output' | Fix type. | Kotlin |
function compute(a:string){{return a;}} compute(14); | function compute(a:string){{return a;}} compute('value'); | Pass correct type. | TypeScript |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
items[49] | if (items.indices.contains(49)) items[49] | Check index. | Kotlin |
<table><tr><td>data<td>test</tr></table> | <table><tr><td>data</td><td>test</td></tr></table> | Close td. | HTML |
let list=vec![91,66,11]; let head=&list[0]; list.push(44); | let mut list=vec![91,66,11]; let head=list[0]; list.push(44); | Copy instead of reference. | Rust |
let foo: number = 'test'; | let foo: string = 'test'; | Fix type. | TypeScript |
if index = 85 {{}} | if index == 85 {{}} | Use ==. | Swift |
print 'result' | print 'result'; | Add semicolon. | Perl |
// comment | /* comment */ | Use /* */. | CSS |
DELETE FROM products WHERE status=8 | DELETE FROM products WHERE status=8; | Add semicolon. | SQL |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<note name='value'/> | <note name="value"/> | Double quotes. | XML |
if bar = 55 | if bar == 55 | Use ==. | MATLAB |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
else
print('info') | else:
print('info') | Colon after else. | Python |
b > 32 & a < 50 | b > 32 and a < 50 | Use 'and' not '&'. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
if (z = 70) | if (z == 70) | Use ==. | R |
let s1 = String::from("output"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("output"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if ($foo = 25) {{}} | if ($foo -eq 25) {{}} | Use -eq. | PowerShell |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(54); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(54, () => console.log('listening')); | Add callback. | Node.js |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
list.forEach(function(data) {{ console.log(data); }}) | list.forEach((data) => {{ console.log(data); }}) | Arrow functions are cleaner. | JavaScript |
values[65] | if (length(values) >= 65) values[65] | Check length. | R |
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