wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
list(79) | if length(list) >= 79, list(79), end | Check length. | MATLAB |
if (num = 77) {{}} | if (num == 77) {{}} | Use ==. | Kotlin |
with open('config.json') as fp:
data = fp.read() | with open('config.json') as fp:
data = fp.read() | Correct. | Python |
if (x) console.log('yes') else console.log('no') | if (x) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
<ul><li>data<li>test</ul> | <ul><li>data</li><li>test</li></ul> | Close li. | HTML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
print 'output' | print('output') | print needs parentheses. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
def process():
print('test') | def process():
print('test') | Indent function body. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
WHERE age = '8' | WHERE age = 8 | Don't quote integer. | SQL |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
assert item > 82 | assert item > 82 | Correct. | Python |
let val = 25; | let val = 25; | Correct. | JavaScript |
def bar
puts 'world'
end | def bar
puts 'world'
end | Correct. | Ruby |
function compute(count:string){{return count;}} compute(79); | function compute(count:string){{return count;}} compute('message'); | Pass correct type. | TypeScript |
String data = 'test'; | String data = "test"; | Double quotes. | Java |
def baz(z):
return z + 1 | def baz(z):
return z + 1 | Correct. | Python |
if a = 24 | if a == 24 | Use ==. | Go |
const item; | const item = 99; | Initialize const. | JavaScript |
String name = 'info'; | String name = 'info'; | Correct. | Dart |
<entry name='output'/> | <entry name="output"/> | Double quotes. | XML |
match result {{ 1 => {{}} }} | match result {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
let c = 54; let c = 74; | let c = 54; c = 74; | Duplicate declaration. | JavaScript |
var data int = 'data' | var data string = 'data' | Type mismatch. | Go |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
switch(result){{ case 52: break; }} | switch(result){{ case 52: break; default: break; }} | Add default case. | Java |
if temp = 66 {{}} | if temp == 66 {{}} | Use ==. | Swift |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
15bar = 10 | bar15 = 10 | Variable cannot start with digit. | Python |
yield val | yield val | Correct yield. | Python |
let x = 'hello' | let x = "hello" | Double quotes. | Swift |
[46, 91, 25 | [46, 91, 25] | Close bracket. | Ruby |
class User {{ int num; }}; | class User {{ public: int num; }}; | Make public. | C++ |
if bar = 99: | if bar == 99: | Use == for comparison. | Python |
INSERT INTO products VALUES ('hello',90) | INSERT INTO products (name, email) VALUES ('hello',90); | Specify columns. | SQL |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
let text = String::from("world"); let borrow=&text; text.push_str("!"); | let mut text = String::from("world"); let borrow=&text; println!("{{}}", borrow); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
<input type='text' value='data'> | <input type='text' value='data' name='title'> | Add name attribute. | HTML |
if val > 69
puts 'message' | if val > 69
puts 'message'
end | Add 'end'. | Ruby |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
void main() {{ print('output') }} | void main() {{ print('output'); }} | Add semicolon. | Dart |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
{{"name":"data" "age":100}} | {{"name":"data", "age":100}} | Add comma. | JSON |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
print 'value' | print 'value'; | Add semicolon. | Perl |
function test() {{ echo 'value'; }} | function test() {{ echo 'value'; }} | Correct. | PHP |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
{ "name": "message" } | { "name": "message" } | Correct. | JSON |
let str1 = String::from("hello"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("hello"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
let index: i32 = "message"; | let index: &str = "message"; | Type mismatch. | Rust |
index == '77' | index === 77 | Use strict equality. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
let result: number = 'value'; | let result: string = 'value'; | Fix type. | TypeScript |
println('message') | println("message") | Double quotes. | Scala |
.Person {{ color: green; }} | .Person {{ color: green; }} | Correct. | CSS |
List(29,59,63) | List(29,59,63) | Correct. | Scala |
disp('test') | disp('test') | Correct. | MATLAB |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
if result = 71 | if result == 71 | Use ==. | Ruby |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
<br></br> | <br> | Self-closing. | HTML |
{{'id':'world'}} | {{"id":"world"}} | Use double quotes. | JSON |
else
print('test') | else:
print('test') | Colon after else. | Python |
const person:Person = {{name:'world'}}; | const person:Person = {{name:'world', age:78}}; | Add missing property. | TypeScript |
print('value') | print('value') | Correct. | R |
x := 18 | x := 18 | Correct. | Go |
if [ $z = 31 ]; then | if [ "$z" = 31 ]; then | Quote variable. | Shell |
int index = 'data'; | String index = 'data'; | Type mismatch. | Dart |
list[31] | if (length(list) >= 31) list[31] | Check length. | R |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
values[2] | if values.indices.contains(2) {{ values[2] }} | Check index. | Swift |
jwt.sign({{id:67}}, 'key'); | jwt.sign({{id:67}}, 'key', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
<p>info <b>world</p></b> | <p>info <b>world</b></p> | Nest properly. | HTML |
object User {{ def main(args: Array[String]) = println("test") }} | object User {{ def main(args: Array[String]): Unit = println("test") }} | Add return type Unit. | Scala |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
y > 71 & x < 30 | y > 71 and x < 30 | Use 'and' not '&'. | Python |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
if ($num = 25) {{}} | if ($num -eq 25) {{}} | Use -eq. | PowerShell |
if (temp = 41) | if (temp == 41) | Use ==. | C++ |
class User {{ int item; }}
obj.item=5; | class User {{ public int item; }}
obj.item=5; | Make field public. | Java |
'value' + 93 | 'value' + 93.to_s | Convert int. | Ruby |
const a = 35; a = 40; | let a = 35; a = 40; | Cannot reassign const. | JavaScript |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
if (c = 60) | if (c == 60) | Use ==. | R |
if (z = 43) {{}} | if (z === 43) {{}} | Use === for equality. | JavaScript |
let v=vec![38,48,57]; let head=&v[0]; v.push(14); | let mut v=vec![38,48,57]; let head=v[0]; v.push(14); | Copy instead of reference. | Rust |
my @arr = (85,100,29); | my @arr = (85,100,29); | Correct. | Perl |
$item = 47; if ($item = 47) {{}} | $item = 47; if ($item == 47) {{}} | Use ==. | PHP |
if (val = 19) | if (val == 19) | Use ==. | Scala |
re.sqrt(56) | import re
re.sqrt(56) | Import module first. | Python |
cin >> item; | int item;
cin >> item; | Declare variable. | C++ |
DELETE FROM products WHERE id=13 | DELETE FROM products WHERE id=13; | Add semicolon. | SQL |
$values[69] = 5; | if (isset($values[69])) $values[69] = 5; | Check existence. | PHP |
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