wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
int[] list = new int[99];
list[99] = 5; | int[] list = new int[99];
if (99 < list.length) list[99] = 5; | Check bounds. | Java |
let data = 'output' | let data = "output" | Double quotes. | Swift |
bar | bar() | Add parentheses. | Kotlin |
const p:Person = {{name:'data'}}; | const p:Person = {{name:'data', age:91}}; | Add missing property. | TypeScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
val count = 'test' | val count = "test" | Double quotes. | Kotlin |
INSERT INTO items VALUES ('message',29) | INSERT INTO items (age, email) VALUES ('message',29); | Specify columns. | SQL |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
let c = 43; let c = 61; | let c = 43; c = 61; | Duplicate declaration. | JavaScript |
if (bar = 38) {{}} | if (bar == 38) {{}} | Use ==. | Kotlin |
WHERE status = '5' | WHERE status = 5 | Don't quote integer. | SQL |
let s1 = String::from("output"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("output"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
for foo in range(61)
print(foo) | for foo in range(61):
print(foo) | Colon after for. | Python |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
const http = require('http'); http.createServer((req,res) => res.end('result')).listen(4); | const http = require('http'); http.createServer((req,res) => res.end('result')).listen(4); | Correct. | Node.js |
def handle(index):
return index + 1 | def handle(index):
return index + 1 | Correct. | Python |
fmt.Println 'data' | fmt.Println('data') | Missing parentheses. | Go |
list(68) | if length(list) >= 68, list(68), end | Check length. | MATLAB |
{{'id':21, 'value' 14}} | {{'id':21, 'value':14}} | Colon missing. | Python |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
while count > 42
count -= 1 | while count > 42:
count -= 1 | Colon missing after while. | Python |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
if num = 76 | if num == 76 | Use ==. | Go |
for (int i=0; i<10; i++) {{}} | for (int i=0; i<10; i++) {{}} | Correct. | Java |
name: value
age: 72 | name: value
age: 72 | Correct. | YAML |
name: hello
value: data, | name: hello
value: data | Remove comma. | YAML |
[72, 39, 89 | [72, 39, 89] | Close bracket. | Ruby |
disp('result') | disp('result') | Correct. | MATLAB |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
'info' + 32 | 'info' + str(32) | Can't add int to string. | Python |
object User {{ def main(args: Array[String]) = println("test") }} | object User {{ def main(args: Array[String]): Unit = println("test") }} | Add return type Unit. | Scala |
if (x = 32) | if (x == 32) | Use ==. | C++ |
let result: i32 = "output"; | let result: &str = "output"; | Type mismatch. | Rust |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if foo = 59 | if foo == 59 | Use ==. | Ruby |
$data = 8; if ($data = 8) {{}} | $data = 8; if ($data == 8) {{}} | Use ==. | PHP |
var c int = 'value' | var c string = 'value' | Type mismatch. | Go |
var x = 19; | var x = 19; | Correct. | Dart |
x := 78 | x := 78 | Correct. | Go |
def handle
puts 'value'
end | def handle
puts 'value'
end | Correct. | Ruby |
arr[32] | if arr.indices.contains(32) {{ arr[32] }} | Check index. | Swift |
if ($num = 95) | if ($num == 95) | Use ==. | Perl |
<user><age>output</age><age>36</age></user | <user><age>output</age><age>36</age></user> | Add closing >. | XML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
else
print('result') | else:
print('result') | Colon after else. | Python |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
yield data | yield data | Correct yield. | Python |
<input type='text' value='output'> | <input type='text' value='output' name='value'> | Add name attribute. | HTML |
'46' + 74 | 46 + 74 | Avoid string coercion. | JavaScript |
JOIN profiles ON products.id = profiles.status | JOIN profiles ON products.id = profiles.status | Correct. | SQL |
let msg = String::from("data"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("data"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
function test(count:string){{return count;}} test(72); | function test(count:string){{return count;}} test('world'); | Pass correct type. | TypeScript |
#content {{ color: blue; }} | #content {{ color: blue; }} | Correct. | CSS |
if val > 35
puts 'value' | if val > 35
puts 'value'
end | Add 'end'. | Ruby |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
let temp: number | null = null; temp.toFixed(88); | let temp: number | null = null; if(temp!==null) temp.toFixed(88); | Null check. | TypeScript |
print 'message' | print 'message'; | Add semicolon. | Perl |
for (b in arr) | for (b of arr) | for...in iterates keys. | JavaScript |
<br></br> | <br> | Self-closing. | HTML |
var x int | var x int | Correct. | Go |
if (result = 51) | if (result == 51) | Use ==. | R |
$values[30] | if ($values.Count -gt 30) {{ $values[30] }} | Check bounds. | PowerShell |
my @arr = (9,88,2); | my @arr = (9,88,2); | Correct. | Perl |
81count = 10 | count81 = 10 | Variable cannot start with digit. | Python |
switch(bar){{ case 25: break; }} | switch(bar){{ case 25: break; default: break; }} | Add default case. | Java |
local num = 87 | local num = 87 | Correct. | Lua |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
DELETE FROM products WHERE id=9 | DELETE FROM products WHERE id=9; | Add semicolon. | SQL |
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
.User {{ color: blue; }} | .User {{ color: blue; }} | Correct. | CSS |
cin >> result
cout << result; | cin >> result;
cout << result; | Add semicolon. | C++ |
["world", 5] | ["world", 5] | Correct. | JSON |
<p>result <b>test</p></b> | <p>result <b>test</b></p> | Nest properly. | HTML |
def render():
print('result') | def render():
print('result') | Indent function body. | Python |
val val = 51; val = 48 | var val = 51; val = 48 | Use var for reassignment. | Scala |
if (bar = 60) {} | if (bar == 60) {} | Use ==. | Dart |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
if [ $count = 89 ]; then | if [ "$count" = 89 ]; then | Quote variable. | Shell |
let s1 = String::from("test"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("test"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
local c = 53 | local c = 53 | Correct. | Lua |
if (z = 72) {{}} | if (z == 72) {{}} | Use ==. | Kotlin |
77num = 10 | num77 = 10 | Variable cannot start with digit. | Python |
String x = 'output'; | String x = "output"; | Double quotes. | Java |
while count > 65
count -= 1 | while count > 65:
count -= 1 | Colon missing after while. | Python |
for (z in data) | for (z of data) | for...in iterates keys. | JavaScript |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
String name = 'hello'; | String name = 'hello'; | Correct. | Dart |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
match a {{ 1 => {{}} }} | match a {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if (bar = 6) | if (bar == 6) | Use ==. | C++ |
if y = 81 then
print('value')
end | if y == 81 then
print('value')
end | Use ==. | Lua |
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