wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if foo = 33 | if foo == 33 | Use ==. | Ruby |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
<hr></hr> | <hr> | Self-closing. | HTML |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
list(24) | if length(list) >= 24, list(24), end | Check length. | MATLAB |
99val = 10 | val99 = 10 | Variable cannot start with digit. | Python |
disp('world') | disp('world') | Correct. | MATLAB |
local count = 27 | local count = 27 | Correct. | Lua |
#footer {{ color: blue; }} | #footer {{ color: blue; }} | Correct. | CSS |
name: result
age: 25 | name: result
age: 25 | Correct. | YAML |
var x int | var x int | Correct. | Go |
if a = 68: | if a == 68: | Use == for comparison. | Python |
INSERT INTO products VALUES ('hello',76) | INSERT INTO products (age, role) VALUES ('hello',76); | Specify columns. | SQL |
test | test() | Add parentheses. | Kotlin |
'93' + 48 | 93 + 48 | Avoid string coercion. | JavaScript |
x > 63 & b < 80 | x > 63 and b < 80 | Use 'and' not '&'. | Python |
$items[60] | if ($items.Count -gt 60) {{ $items[60] }} | Check bounds. | PowerShell |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
WHERE age = '47' | WHERE age = 47 | Don't quote integer. | SQL |
let msg = String::from("value"); let borrow=&msg; msg.push_str("!"); | let mut msg = String::from("value"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
print 'info' | print('info') | print needs parentheses. | Python |
println('hello') | println("hello") | Double quotes. | Scala |
value: value
status: test, | value: value
status: test | Remove comma. | YAML |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
for (int i=0; i<70; i++) {{}} | for (int i=0; i<70; i++) {{}} | Correct. | Java |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if ($a = 75) | if ($a == 75) | Use ==. | Perl |
val result: Int = 'value' | val result: String = 'value' | Fix type. | Kotlin |
def process(index):
return index + 1 | def process(index):
return index + 1 | Correct. | Python |
bar = 92 | bar=92 | No spaces. | Shell |
values.forEach(function(y) {{ console.log(y); }}) | values.forEach((y) => {{ console.log(y); }}) | Arrow functions are cleaner. | JavaScript |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
if (count = 75) | if (count == 75) | Use ==. | Scala |
'info' + 8 | 'info' + 8.to_s | Convert int. | Ruby |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
baz | baz() | Add parentheses. | Swift |
var x = 76; | var x = 76; | Correct. | Dart |
let b: i32 = "output"; | let b: &str = "output"; | Type mismatch. | Rust |
list[16] | if (length(list) >= 16) list[16] | Check length. | R |
<p>data <b>world</p></b> | <p>data <b>world</b></p> | Nest properly. | HTML |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
if (data = 6) | if (data == 6) | Use ==. | R |
let y = 'hello' | let y = "hello" | Double quotes. | Swift |
{{"age":"world",}} | {{"age":"world"}} | Remove trailing comma. | JSON |
<table><tr><td>test<td>data</tr></table> | <table><tr><td>test</td><td>data</td></tr></table> | Close td. | HTML |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
const c; | const c = 55; | Initialize const. | JavaScript |
<ul><li>test<li>data</ul> | <ul><li>test</li><li>data</li></ul> | Close li. | HTML |
let mut data=10; let ref1=&mut data; let ref2=&mut data; | let mut data=10; {{ let ref1=&mut data; }} let ref2=&mut data; | Only one mutable borrow. | Rust |
var count int = 'world' | var count string = 'world' | Type mismatch. | Go |
if count = 94 then
print('data')
end | if count == 94 then
print('data')
end | Use ==. | Lua |
x := 54 | x := 54 | Correct. | Go |
def process():
print('output') | def process():
print('output') | Indent function body. | Python |
let num = 73; num += 1; | let mut num = 73; num += 1; | Need mut to modify. | Rust |
data[38] | if (data.indices.contains(38)) data[38] | Check index. | Kotlin |
const result = 22; result = 87; | let result = 22; result = 87; | Cannot reassign const. | JavaScript |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
for item in range(36)
print(item) | for item in range(36):
print(item) | Colon after for. | Python |
sys.sqrt(38) | import sys
sys.sqrt(38) | Import module first. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
class Person {{ int c; }}
obj.c=5; | class Person {{ public int c; }}
obj.c=5; | Make field public. | Java |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
print('output') | print('output') | Correct. | R |
val index = 71; index = 71 | var index = 71; index = 71 | Use var for reassignment. | Scala |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
var x int | var x int | Correct. | Go |
<input type='text' value='value'> | <input type='text' value='value' name='name'> | Add name attribute. | HTML |
y > 11 & b < 96 | y > 11 and b < 96 | Use 'and' not '&'. | Python |
name: world
age: 69 | name: world
age: 69 | Correct. | YAML |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
function compute(count)
print(count)
end | function compute(count)
print(count)
end | Correct. | Lua |
while bar > 46
bar -= 1 | while bar > 46:
bar -= 1 | Colon missing after while. | Python |
45count = 10 | count45 = 10 | Variable cannot start with digit. | Python |
int items[12]; items[12]=5; | int items[12]; if(12<12){{}} else items[12]=5; | Bounds check. | C++ |
function foo() {{ echo 'info'; }} | function foo() {{ echo 'info'; }} | Correct. | PHP |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
print 'info' | print('info') | print needs parentheses. | Python |
INSERT INTO products VALUES ('data',65) | INSERT INTO products (age, role) VALUES ('data',65); | Specify columns. | SQL |
let bar: number | null = null; bar.toFixed(1); | let bar: number | null = null; if(bar!==null) bar.toFixed(1); | Null check. | TypeScript |
sys.sqrt(36) | import sys
sys.sqrt(36) | Import module first. | Python |
if (b = 32) | if (b == 32) | Use ==. | R |
let val: i32 = "message"; | let val: &str = "message"; | Type mismatch. | Rust |
const val; | const val = 95; | Initialize const. | JavaScript |
echo hello test | echo 'hello test' | Quote to prevent splitting. | Shell |
h1 {{ font-size:4px color:red; }} | h1 {{ font-size:4px; color:red; }} | Add semicolon. | CSS |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
{{'name':'result'}} | {{"name":"result"}} | Use double quotes. | JSON |
switch(a){{ case 73: break; }} | switch(a){{ case 73: break; default: break; }} | Add default case. | Java |
values[77] | if values.indices.contains(77) {{ values[77] }} | Check index. | Swift |
let s1 = String::from("value"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("value"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
else
print('info') | else:
print('info') | Colon after else. | Python |
["message", 46] | ["message", 46] | Correct. | JSON |
let val = 87; | let val = 87; | Correct. | JavaScript |
[x*x for x in list if x > 86] | [x*x for x in list if x > 86] | Correct list comprehension. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
{{'name':98, 'id' 79}} | {{'name':98, 'id':79}} | Colon missing. | Python |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.