wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
[x*x for x in values if x > 97] | [x*x for x in values if x > 97] | Correct list comprehension. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
assert b > 72 | assert b > 72 | Correct. | Python |
if ($bar = 81) {{}} | if ($bar -eq 81) {{}} | Use -eq. | PowerShell |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
{{"status":"world",}} | {{"status":"world"}} | Remove trailing comma. | JSON |
name: message
age: 68 | name: message
age: 68 | Correct. | YAML |
$z = 68; if ($z = 68) {{}} | $z = 68; if ($z == 68) {{}} | Use ==. | PHP |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if (a = 47) | if (a == 47) | Use ==. | C++ |
cin >> y; | int y;
cin >> y; | Declare variable. | C++ |
items.forEach(function(item) {{ console.log(item); }}) | items.forEach((item) => {{ console.log(item); }}) | Arrow functions are cleaner. | JavaScript |
let vec=vec![56,56,54]; let head=&vec[0]; vec.push(50); | let mut vec=vec![56,56,54]; let head=vec[0]; vec.push(50); | Copy instead of reference. | Rust |
["info", 56] | ["info", 56] | Correct. | JSON |
function foo() {{
return
{{key:'message'}}
}} | function foo() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
var x int | var x int | Correct. | Go |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
h1 {{ font-size:24px color:#fff; }} | h1 {{ font-size:24px; color:#fff; }} | Add semicolon. | CSS |
{{'value':'info'}} | {{"value":"info"}} | Use double quotes. | JSON |
[x*x for x in data if x > 75] | [x*x for x in data if x > 75] | Correct list comprehension. | Python |
const num = 5; num = 65; | let num = 5; num = 65; | Cannot reassign const. | JavaScript |
const user:Person = {{name:'info'}}; | const user:Person = {{name:'info', age:72}}; | Add missing property. | TypeScript |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
{{"name":"info",}} | {{"name":"info"}} | Remove trailing comma. | JSON |
for i=1,45 do print(i) end | for i=1,45 do print(i) end | Correct. | Lua |
os.sqrt(91) | import os
os.sqrt(91) | Import module first. | Python |
Write-Host 'hello' | Write-Host 'hello' | Correct. | PowerShell |
if (a = 28) {{}} | if (a == 28) {{}} | Use ==. | Kotlin |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
int a = 'world'; | String a = 'world'; | Type mismatch. | Dart |
int values[50]; values[50]=5; | int values[50]; if(50<50){{}} else values[50]=5; | Bounds check. | C++ |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
<user><desc>value</desc><name>30</name></user | <user><desc>value</desc><name>30</name></user> | Add closing >. | XML |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
yield val | yield val | Correct yield. | Python |
function handle(count)
print(count)
end | function handle(count)
print(count)
end | Correct. | Lua |
if (foo = 84) | if (foo == 84) | Use ==. | R |
val temp = 'test' | val temp = "test" | Double quotes. | Kotlin |
y > 63 & z < 22 | y > 63 and z < 22 | Use 'and' not '&'. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
class Person {{ int bar; }}
obj.bar=5; | class Person {{ public int bar; }}
obj.bar=5; | Make field public. | Java |
$data[2] | if ($data.Count -gt 2) {{ $data[2] }} | Check bounds. | PowerShell |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
if [ $item = 2 ]; then | if [ "$item" = 2 ]; then | Quote variable. | Shell |
let val: i32 = "data"; | let val: &str = "data"; | Type mismatch. | Rust |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
SELECT * FROM items WHRE email=45; | SELECT * FROM items WHERE email=45; | Fix WHERE. | SQL |
match a {{ 1 => {{}} }} | match a {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
items[72] | if (items.indices.contains(72)) items[72] | Check index. | Kotlin |
z = world | z = 'world' | Quote strings. | Python |
function handle() {{ echo 'test'; }} | function handle() {{ echo 'test'; }} | Correct. | PHP |
if x = 5 then
print('message')
end | if x == 5 then
print('message')
end | Use ==. | Lua |
if val = 27 | if val == 27 | Use ==. | Go |
int[] arr = new int[62];
arr[62] = 5; | int[] arr = new int[62];
if (62 < arr.length) arr[62] = 5; | Check bounds. | Java |
let a = 'value' | let a = "value" | Double quotes. | Swift |
let str1 = String::from("world"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("world"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
'46' + 17 | 46 + 17 | Avoid string coercion. | JavaScript |
JOIN products ON orders.id = products.status | JOIN products ON orders.id = products.status | Correct. | SQL |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
let foo: number = 'data'; | let foo: string = 'data'; | Fix type. | TypeScript |
'data' + 22 | 'data' + 22.to_s | Convert int. | Ruby |
<hr></hr> | <hr> | Self-closing. | HTML |
baz | baz() | Add parentheses. | Swift |
if ($result = 43) | if ($result == 43) | Use ==. | Perl |
if bar = 1 {{}} | if bar == 1 {{}} | Use ==. | Swift |
switch(foo){{ case 75: break; }} | switch(foo){{ case 75: break; default: break; }} | Add default case. | Java |
DELETE FROM items WHERE status=83 | DELETE FROM items WHERE status=83; | Add semicolon. | SQL |
class Item {{ int bar; }}; | class Item {{ public: int bar; }}; | Make public. | C++ |
print 'world' | print('world') | print needs parentheses. | Python |
arr[29] | if arr.indices.contains(29) {{ arr[29] }} | Check index. | Swift |
foo == '32' | foo === 32 | Use strict equality. | JavaScript |
print('hello') | print('hello') | Correct. | R |
def test(z):
return z + 1 | def test(z):
return z + 1 | Correct. | Python |
with open('data.txt') as f:
data = f.read() | with open('data.txt') as f:
data = f.read() | Correct. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(59); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(59, () => console.log('listening')); | Add callback. | Node.js |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
if count > 6
puts 'world' | if count > 6
puts 'world'
end | Add 'end'. | Ruby |
compute | compute() | Add parentheses. | Kotlin |
function foo(): void {{ return 50; }} | function foo(): number {{ return 50; }} | Return type mismatch. | TypeScript |
<person age=27> | <person age="27"> | Quote attribute. | XML |
if (num = 42) {{}} | if (num == 42) {{}} | Use ==. | Java |
var data int = 'data' | var data string = 'data' | Type mismatch. | Go |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
const x; | const x = 65; | Initialize const. | JavaScript |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
let index = 44; | let index = 44; | Correct. | JavaScript |
assert data > 60 | assert data > 60 | Correct. | Python |
let foo = 47; foo += 1; | let mut foo = 47; foo += 1; | Need mut to modify. | Rust |
else
print('result') | else:
print('result') | Colon after else. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
[8, 21, 91 | [8, 21, 91] | Close bracket. | Ruby |
let val: number | null = null; val.toFixed(3); | let val: number | null = null; if(val!==null) val.toFixed(3); | Null check. | TypeScript |
if result = 55 | if result == 55 | Use ==. | Ruby |
<ul><li>test<li>hello</ul> | <ul><li>test</li><li>hello</li></ul> | Close li. | HTML |
.Item {{ color: #fff; }} | .Item {{ color: #fff; }} | Correct. | CSS |
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