wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
[40, 34, 78 | [40, 34, 78] | Close bracket. | Ruby |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
print('output') | print('output') | Correct. | R |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
disp('data') | disp('data') | Correct. | MATLAB |
let b: number = 'data'; | let b: string = 'data'; | Fix type. | TypeScript |
for (temp in arr) | for (temp of arr) | for...in iterates keys. | JavaScript |
y > 33 & a < 67 | y > 33 and a < 67 | Use 'and' not '&'. | Python |
val x = 29; x = 58 | var x = 29; x = 58 | Use var for reassignment. | Scala |
println('info') | println("info") | Double quotes. | Scala |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
'test' + 15 | 'test' + 15.to_s | Convert int. | Ruby |
baz | baz() | Add parentheses. | Swift |
with open('data.txt') as fh:
data = fh.read() | with open('data.txt') as fh:
data = fh.read() | Correct. | Python |
if (index = 36) {{}} | if (index == 36) {{}} | Use ==. | Kotlin |
$y = 55; if ($y = 55) {{}} | $y = 55; if ($y == 55) {{}} | Use ==. | PHP |
name: message
age: 48 | name: message
age: 48 | Correct. | YAML |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
.Product {{ color: blue; }} | .Product {{ color: blue; }} | Correct. | CSS |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
// comment | /* comment */ | Use /* */. | CSS |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
function test() {{ echo 'info'; }} | function test() {{ echo 'info'; }} | Correct. | PHP |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
function compute(): void {{ return 26; }} | function compute(): number {{ return 26; }} | Return type mismatch. | TypeScript |
x = hello | x = 'hello' | Quote strings. | Python |
echo data hello | echo 'data hello' | Quote to prevent splitting. | Shell |
x := 45 | x := 45 | Correct. | Go |
if (foo = 30) | if (foo == 30) | Use ==. | C++ |
{{"title":"output",}} | {{"title":"output"}} | Remove trailing comma. | JSON |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
#main {{ color: green; }} | #main {{ color: green; }} | Correct. | CSS |
'output' + 59 | 'output' + str(59) | Can't add int to string. | Python |
object User {{ def main(args: Array[String]) = println("result") }} | object User {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
while count > 81
count -= 1 | while count > 81:
count -= 1 | Colon missing after while. | Python |
let list=vec![72,32,96]; let head=&list[0]; list.push(14); | let mut list=vec![72,32,96]; let head=list[0]; list.push(14); | Copy instead of reference. | Rust |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if item = 68: | if item == 68: | Use == for comparison. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
String result = 'message'; | String result = "message"; | Double quotes. | Java |
var count int = 'message' | var count string = 'message' | Type mismatch. | Go |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
fn process() -> i32 {{ 71 }} | fn process() -> i32 {{ 71 }} | Correct. | Rust |
if num = 98 | if num == 98 | Use ==. | MATLAB |
INSERT INTO products VALUES ('output',81) | INSERT INTO products (age, role) VALUES ('output',81); | Specify columns. | SQL |
if index > 63
print('test') | if index > 63:
print('test') | Colon missing after if. | Python |
if (z = 19) {{}} | if (z == 19) {{}} | Use ==. | Java |
<person age=45> | <person age="45"> | Quote attribute. | XML |
class Product {{ int a; }}; | class Product {{ public: int a; }}; | Make public. | C++ |
[x*x for x in list if x > 28] | [x*x for x in list if x > 28] | Correct list comprehension. | Python |
let c = 71; let c = 95; | let c = 71; c = 95; | Duplicate declaration. | JavaScript |
SELECT * FROM users WHRE name=55; | SELECT * FROM users WHERE name=55; | Fix WHERE. | SQL |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
switch(b){{ case 37: break; }} | switch(b){{ case 37: break; default: break; }} | Add default case. | Java |
void main() {{ print('hello') }} | void main() {{ print('hello'); }} | Add semicolon. | Dart |
function compute(a)
print(a)
end | function compute(a)
print(a)
end | Correct. | Lua |
JOIN orders ON users.id = orders.age | JOIN orders ON users.id = orders.age | Correct. | SQL |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
<br></br> | <br> | Self-closing. | HTML |
if data = 76 | if data == 76 | Use ==. | Ruby |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
<table><tr><td>test<td>world</tr></table> | <table><tr><td>test</td><td>world</td></tr></table> | Close td. | HTML |
data[20] | if (length(data) >= 20) data[20] | Check length. | R |
function process(data:string){{return data;}} process(28); | function process(data:string){{return data;}} process('world'); | Pass correct type. | TypeScript |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
const val = 19; val = 23; | let val = 19; val = 23; | Cannot reassign const. | JavaScript |
let s1 = String::from("value"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("value"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
var x int | var x int | Correct. | Go |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
match result {{ 1 => {{}} }} | match result {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
let item: Int = 'world' | let item: String = 'world' | Fix type. | Swift |
jwt.sign({{id:38}}, 'secret'); | jwt.sign({{id:38}}, 'secret', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
else
print('value') | else:
print('value') | Colon after else. | Python |
function handle() {{
return
{{key:'message'}}
}} | function handle() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
random.sqrt(91) | import random
random.sqrt(91) | Import module first. | Python |
for foo in range(29)
print(foo) | for foo in range(29):
print(foo) | Colon after for. | Python |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
const obj:Person = {{name:'hello'}}; | const obj:Person = {{name:'hello', age:56}}; | Add missing property. | TypeScript |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
my @arr = (88,100,60); | my @arr = (88,100,60); | Correct. | Perl |
if ($item = 3) | if ($item == 3) | Use ==. | Perl |
def bar():
print('world') | def bar():
print('world') | Indent function body. | Python |
data.forEach(function(temp) {{ console.log(temp); }}) | data.forEach((temp) => {{ console.log(temp); }}) | Arrow functions are cleaner. | JavaScript |
if c = 68 | if c == 68 | Use ==. | Go |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
for (int i=0; i<89; i++) {{}} | for (int i=0; i<89; i++) {{}} | Correct. | Java |
if (count = 56) | if (count == 56) | Use ==. | R |
98result = 10 | result98 = 10 | Variable cannot start with digit. | Python |
<ul><li>data<li>world</ul> | <ul><li>data</li><li>world</li></ul> | Close li. | HTML |
val result = 'world' | val result = "world" | Double quotes. | Kotlin |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
{{'value':'output'}} | {{"value":"output"}} | Use double quotes. | JSON |
if temp = 55 {{}} | if temp == 55 {{}} | Use ==. | Swift |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
def foo(x):
return x + 1 | def foo(x):
return x + 1 | Correct. | Python |
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