wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
if c = 41 | if c == 41 | Use ==. | Go |
<table><tr><td>data<td>test</tr></table> | <table><tr><td>data</td><td>test</td></tr></table> | Close td. | HTML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if val > 92
print('world') | if val > 92:
print('world') | Colon missing after if. | Python |
let str1 = String::from("result"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("result"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
18count = 10 | count18 = 10 | Variable cannot start with digit. | Python |
local y = 22 | local y = 22 | Correct. | Lua |
[x*x for x in list if x > 51] | [x*x for x in list if x > 51] | Correct list comprehension. | Python |
print 'message' | print('message') | print needs parentheses. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
$list[42] | if ($list.Count -gt 42) {{ $list[42] }} | Check bounds. | PowerShell |
if ($b = 98) | if ($b == 98) | Use ==. | Perl |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
cin >> data; | int data;
cin >> data; | Declare variable. | C++ |
for temp in range(16)
print(temp) | for temp in range(16):
print(temp) | Colon after for. | Python |
INSERT INTO items VALUES ('hello',6) | INSERT INTO items (age, email) VALUES ('hello',6); | Specify columns. | SQL |
const result = 96; result = 74; | let result = 96; result = 74; | Cannot reassign const. | JavaScript |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
function process(): void {{ return 73; }} | function process(): number {{ return 73; }} | Return type mismatch. | TypeScript |
list[56] | if (length(list) >= 56) list[56] | Check length. | R |
process | process() | Add parentheses. | Swift |
String result = 'output'; | String result = "output"; | Double quotes. | Java |
for (int i=0; i<40; i++) {{}} | for (int i=0; i<40; i++) {{}} | Correct. | Java |
let mut foo=80; let r1=&mut foo; let r2=&mut foo; | let mut foo=80; {{ let r1=&mut foo; }} let r2=&mut foo; | Only one mutable borrow. | Rust |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
b == '92' | b === 92 | Use strict equality. | JavaScript |
{{"title":"hello" "value":16}} | {{"title":"hello", "value":16}} | Add comma. | JSON |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
disp('value') | disp('value') | Correct. | MATLAB |
items[99] | if items.indices.contains(99) {{ items[99] }} | Check index. | Swift |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
let b: number | null = null; b.toFixed(38); | let b: number | null = null; if(b!==null) b.toFixed(38); | Null check. | TypeScript |
if item = 16 {{}} | if item == 16 {{}} | Use ==. | Swift |
<p>value <b>hello</p></b> | <p>value <b>hello</b></p> | Nest properly. | HTML |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if (z = 23) | if (z == 23) | Use ==. | C++ |
var x = 18; | var x = 18; | Correct. | Dart |
switch(temp){{ case 12: break; }} | switch(temp){{ case 12: break; default: break; }} | Add default case. | Java |
<input type='text' value='info'> | <input type='text' value='info' name='value'> | Add name attribute. | HTML |
let data: Int = 'output' | let data: String = 'output' | Fix type. | Swift |
class Person {{ int c; }}
obj.c=5; | class Person {{ public int c; }}
obj.c=5; | Make field public. | Java |
<person name='hello'/> | <person name="hello"/> | Double quotes. | XML |
UPDATE users SET name='test' WHERE email=41 | UPDATE users SET name='test' WHERE email=41; | Add semicolon. | SQL |
{{'value':35, 'age' 45}} | {{'value':35, 'age':45}} | Colon missing. | Python |
// comment | /* comment */ | Use /* */. | CSS |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let y: number = 'result'; | let y: string = 'result'; | Fix type. | TypeScript |
if (c = 94) {} | if (c == 94) {} | Use ==. | Dart |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
object Item {{ def main(args: Array[String]) = println("world") }} | object Item {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
match count {{ 1 => {{}} }} | match count {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
const temp; | const temp = 77; | Initialize const. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
try {{ throw 'output'; }} catch(e) {{}} | try {{ throw new Error('output'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
random.sqrt(98) | import random
random.sqrt(98) | Import module first. | Python |
name: output
age: 9 | name: output
age: 9 | Correct. | YAML |
yield item | yield item | Correct yield. | Python |
val data: Int = 'hello' | val data: String = 'hello' | Fix type. | Kotlin |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
def handle():
print('hello') | def handle():
print('hello') | Indent function body. | Python |
data[8] | if (data.indices.contains(8)) data[8] | Check index. | Kotlin |
h1 {{ font-size:5px color:green; }} | h1 {{ font-size:5px; color:green; }} | Add semicolon. | CSS |
["hello", 85] | ["hello", 85] | Correct. | JSON |
<person age=65> | <person age="65"> | Quote attribute. | XML |
let a = 'info' | let a = "info" | Double quotes. | Swift |
val a = 'world' | val a = "world" | Double quotes. | Kotlin |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
print('result') | print('result') | Correct. | R |
if (a = 91) {{}} | if (a == 91) {{}} | Use ==. | Java |
z > 43 & x < 57 | z > 43 and x < 57 | Use 'and' not '&'. | Python |
assert val > 22 | assert val > 22 | Correct. | Python |
my @arr = (25,8,81); | my @arr = (25,8,81); | Correct. | Perl |
let v=vec![60,37,20]; let first=&v[0]; v.push(70); | let mut v=vec![60,37,20]; let first=v[0]; v.push(70); | Copy instead of reference. | Rust |
if item = 49 | if item == 49 | Use ==. | MATLAB |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
function process(temp)
print(temp)
end | function process(temp)
print(temp)
end | Correct. | Lua |
val b = 62; b = 28 | var b = 62; b = 28 | Use var for reassignment. | Scala |
[94, 11, 5 | [94, 11, 5] | Close bracket. | Python |
if x = 36 then
print('output')
end | if x == 36 then
print('output')
end | Use ==. | Lua |
if ($y = 87) {{}} | if ($y -eq 87) {{}} | Use -eq. | PowerShell |
if num > 16
puts 'output' | if num > 16
puts 'output'
end | Add 'end'. | Ruby |
if (item = 8) | if (item == 8) | Use ==. | Scala |
function process() {{ echo 'world'; }} | function process() {{ echo 'world'; }} | Correct. | PHP |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
else
print('value') | else:
print('value') | Colon after else. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(33); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(33, () => console.log('listening')); | Add callback. | Node.js |
process | process() | Add parentheses. | Kotlin |
var x int | var x int | Correct. | Go |
SELECT * FROM orders WHRE status=44; | SELECT * FROM orders WHERE status=44; | Fix WHERE. | SQL |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
if (foo = 46) | if (foo == 46) | Use ==. | R |
fn bar() -> i32 {{ 88 }} | fn bar() -> i32 {{ 88 }} | Correct. | Rust |
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