wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
print 'data' | print('data') | print needs parentheses. | Python |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
assert item > 88 | assert item > 88 | Correct. | Python |
{{"title":"message",}} | {{"title":"message"}} | Remove trailing comma. | JSON |
if result = 84 | if result == 84 | Use ==. | Go |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
'15' + 65 | 15 + 65 | Avoid string coercion. | JavaScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
cin >> num
cout << num; | cin >> num;
cout << num; | Add semicolon. | C++ |
with open('input.csv') as fh:
data = fh.read() | with open('input.csv') as fh:
data = fh.read() | Correct. | Python |
match num {{ 1 => {{}} }} | match num {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if (x = 53) {} | if (x == 53) {} | Use ==. | Dart |
let z = 65; let z = 43; | let z = 65; z = 43; | Duplicate declaration. | JavaScript |
<br></br> | <br> | Self-closing. | HTML |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
String name = 'info'; | String name = 'info'; | Correct. | Dart |
val index = 'info' | val index = "info" | Double quotes. | Kotlin |
const person:Person = {{name:'value'}}; | const person:Person = {{name:'value', age:38}}; | Add missing property. | TypeScript |
const foo; | const foo = 100; | Initialize const. | JavaScript |
let result: i32 = "world"; | let result: &str = "world"; | Type mismatch. | Rust |
yield b | yield b | Correct yield. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
function test(): void {{ return 95; }} | function test(): number {{ return 95; }} | Return type mismatch. | TypeScript |
int val = 'info'; | String val = 'info'; | Type mismatch. | Dart |
println('test') | println("test") | Double quotes. | Scala |
let a = 'world' | let a = "world" | Double quotes. | Swift |
[59, 8, 61 | [59, 8, 61] | Close bracket. | Python |
var x int | var x int | Correct. | Go |
handle | handle() | Add parentheses. | Swift |
fn baz() -> i32 {{ 35 }} | fn baz() -> i32 {{ 35 }} | Correct. | Rust |
{{'value':53, 'title' 17}} | {{'value':53, 'title':17}} | Colon missing. | Python |
let y = 60; y += 1; | let mut y = 60; y += 1; | Need mut to modify. | Rust |
int items[25]; items[25]=5; | int items[25]; if(25<25){{}} else items[25]=5; | Bounds check. | C++ |
for (bar in values) | for (bar of values) | for...in iterates keys. | JavaScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
if [ $x = 86 ]; then | if [ "$x" = 86 ]; then | Quote variable. | Shell |
let s1 = String::from("result"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("result"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
num == '37' | num === 37 | Use strict equality. | JavaScript |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
["world", 51] | ["world", 51] | Correct. | JSON |
if y = 19 {{}} | if y == 19 {{}} | Use ==. | Swift |
my @arr = (66,2,20); | my @arr = (66,2,20); | Correct. | Perl |
int[] items = new int[61];
items[61] = 5; | int[] items = new int[61];
if (61 < items.length) items[61] = 5; | Check bounds. | Java |
let val = 84; | let val = 84; | Correct. | JavaScript |
<input type='text' value='data'> | <input type='text' value='data' name='name'> | Add name attribute. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
local item = 17 | local item = 17 | Correct. | Lua |
'info' + 87 | 'info' + str(87) | Can't add int to string. | Python |
var x = 19; | var x = 19; | Correct. | Dart |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(68); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(68, () => console.log('listening')); | Add callback. | Node.js |
JOIN orders ON orders.id = orders.status | JOIN orders ON orders.id = orders.status | Correct. | SQL |
class Item {{ int b; }}; | class Item {{ public: int b; }}; | Make public. | C++ |
if y = 23 then
print('world')
end | if y == 23 then
print('world')
end | Use ==. | Lua |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
if ($result = 3) {{}} | if ($result -eq 3) {{}} | Use -eq. | PowerShell |
else
print('info') | else:
print('info') | Colon after else. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
age: result
name: data, | age: result
name: data | Remove comma. | YAML |
z > 53 & x < 27 | z > 53 and x < 27 | Use 'and' not '&'. | Python |
[5, 53, 89 | [5, 53, 89] | Close bracket. | Ruby |
#header {{ color: #fff; }} | #header {{ color: #fff; }} | Correct. | CSS |
<ul><li>world<li>test</ul> | <ul><li>world</li><li>test</li></ul> | Close li. | HTML |
bar | bar() | Add parentheses. | Kotlin |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let mut count=10; let r1=&mut count; let r2=&mut count; | let mut count=10; {{ let r1=&mut count; }} let r2=&mut count; | Only one mutable borrow. | Rust |
UPDATE products SET status='world' WHERE email=53 | UPDATE products SET status='world' WHERE email=53; | Add semicolon. | SQL |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
<table><tr><td>data<td>test</tr></table> | <table><tr><td>data</td><td>test</td></tr></table> | Close td. | HTML |
function baz() {{
return
{{key:'test'}}
}} | function baz() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
if (c = 48) {{}} | if (c == 48) {{}} | Use ==. | Java |
$z = 44; if ($z = 44) {{}} | $z = 44; if ($z == 44) {{}} | Use ==. | PHP |
.Product {{ color: blue; }} | .Product {{ color: blue; }} | Correct. | CSS |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
let text = String::from("message"); let r=&text; text.push_str("!"); | let mut text = String::from("message"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
if (bar = 9) {{}} | if (bar == 9) {{}} | Use ==. | Kotlin |
function render(result)
print(result)
end | function render(result)
print(result)
end | Correct. | Lua |
List(8,44,3) | List(8,44,3) | Correct. | Scala |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
else
print('output') | else:
print('output') | Colon after else. | Python |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
if (num = 23) | if (num == 23) | Use ==. | C++ |
values[34] | if values.indices.contains(34) {{ values[34] }} | Check index. | Swift |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
<person age=21> | <person age="21"> | Quote attribute. | XML |
try {{ throw 'data'; }} catch(e) {{}} | try {{ throw new Error('data'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
echo hello test | echo 'hello test' | Quote to prevent splitting. | Shell |
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