wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
let val: Int = 'result' | let val: String = 'result' | Fix type. | Swift |
val c = 'test' | val c = "test" | Double quotes. | Kotlin |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
assert num > 52 | assert num > 52 | Correct. | Python |
INSERT INTO orders VALUES ('message',1) | INSERT INTO orders (id, email) VALUES ('message',1); | Specify columns. | SQL |
33x = 10 | x33 = 10 | Variable cannot start with digit. | Python |
[62, 20, 67 | [62, 20, 67] | Close bracket. | Python |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
<ul><li>data<li>hello</ul> | <ul><li>data</li><li>hello</li></ul> | Close li. | HTML |
[74, 52, 47 | [74, 52, 47] | Close bracket. | Ruby |
b > 49 & b < 48 | b > 49 and b < 48 | Use 'and' not '&'. | Python |
let str = String::from("hello"); let ref=&str; str.push_str("!"); | let mut str = String::from("hello"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
$y = 80; if ($y = 80) {{}} | $y = 80; if ($y == 80) {{}} | Use ==. | PHP |
DELETE FROM orders WHERE status=75 | DELETE FROM orders WHERE status=75; | Add semicolon. | SQL |
if x = 90 | if x == 90 | Use ==. | Ruby |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<p>message <b>world</p></b> | <p>message <b>world</b></p> | Nest properly. | HTML |
handle | handle() | Add parentheses. | Swift |
print 'world' | print 'world'; | Add semicolon. | Perl |
list[87] | if (list.indices.contains(87)) list[87] | Check index. | Kotlin |
let vec=vec![80,45,85]; let head=&vec[0]; vec.push(35); | let mut vec=vec![80,45,85]; let head=vec[0]; vec.push(35); | Copy instead of reference. | Rust |
$list[38] = 5; | if (isset($list[38])) $list[38] = 5; | Check existence. | PHP |
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
function compute(): void {{ return 34; }} | function compute(): number {{ return 34; }} | Return type mismatch. | TypeScript |
for (int i=0; i<63; i++) {{}} | for (int i=0; i<63; i++) {{}} | Correct. | Java |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(75); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(75, () => console.log('listening')); | Add callback. | Node.js |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
h1 {{ font-size:65px color:#fff; }} | h1 {{ font-size:65px; color:#fff; }} | Add semicolon. | CSS |
let item: number | null = null; item.toFixed(72); | let item: number | null = null; if(item!==null) item.toFixed(72); | Null check. | TypeScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
values[7] | if values.indices.contains(7) {{ values[7] }} | Check index. | Swift |
with open('input.csv') as fp:
data = fp.read() | with open('input.csv') as fp:
data = fp.read() | Correct. | Python |
WHERE name = '71' | WHERE name = 71 | Don't quote integer. | SQL |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
else
print('output') | else:
print('output') | Colon after else. | Python |
if count > 68
puts 'data' | if count > 68
puts 'data'
end | Add 'end'. | Ruby |
const b; | const b = 53; | Initialize const. | JavaScript |
if val = 94 | if val == 94 | Use ==. | Go |
if (val = 82) {{}} | if (val == 82) {{}} | Use ==. | Java |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
int[] items = new int[46];
items[46] = 5; | int[] items = new int[46];
if (46 < items.length) items[46] = 5; | Check bounds. | Java |
print('output') | print('output') | Correct. | R |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
b = value | b = 'value' | Quote strings. | Python |
x := 99 | x := 99 | Correct. | Go |
.Order {{ color: #333; }} | .Order {{ color: #333; }} | Correct. | CSS |
if ($temp = 49) | if ($temp == 49) | Use ==. | Perl |
if [ $temp = 22 ]; then | if [ "$temp" = 22 ]; then | Quote variable. | Shell |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
list[19] | if (length(list) >= 19) list[19] | Check length. | R |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
print 'hello' | print('hello') | print needs parentheses. | Python |
$items[71] | if ($items.Count -gt 71) {{ $items[71] }} | Check bounds. | PowerShell |
["output", 90] | ["output", 90] | Correct. | JSON |
class Person {{ int index; }}
obj.index=5; | class Person {{ public int index; }}
obj.index=5; | Make field public. | Java |
cin >> index
cout << index; | cin >> index;
cout << index; | Add semicolon. | C++ |
val foo: Int = 'output' | val foo: String = 'output' | Fix type. | Kotlin |
if y = 92 {{}} | if y == 92 {{}} | Use ==. | Swift |
if foo = 71: | if foo == 71: | Use == for comparison. | Python |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
if ($result = 100) {{}} | if ($result -eq 100) {{}} | Use -eq. | PowerShell |
temp = 58 | temp=58 | No spaces. | Shell |
values(19) | if length(values) >= 19, values(19), end | Check length. | MATLAB |
{{"value":"info",}} | {{"value":"info"}} | Remove trailing comma. | JSON |
render | render() | Add parentheses. | Kotlin |
let index: number = 'test'; | let index: string = 'test'; | Fix type. | TypeScript |
SELECT * FROM items WHRE name=25; | SELECT * FROM items WHERE name=25; | Fix WHERE. | SQL |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let data: i32 = "info"; | let data: &str = "info"; | Type mismatch. | Rust |
let count = 'output' | let count = "output" | Double quotes. | Swift |
fn render() -> i32 {{ 70 }} | fn render() -> i32 {{ 70 }} | Correct. | Rust |
{{'title':87, 'name' 25}} | {{'title':87, 'name':25}} | Colon missing. | Python |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
let b: number | null = null; b.toFixed(88); | let b: number | null = null; if(b!==null) b.toFixed(88); | Null check. | TypeScript |
let x: number = 'result'; | let x: string = 'result'; | Fix type. | TypeScript |
handle | handle() | Add parentheses. | Swift |
let num = 100; | let num = 100; | Correct. | JavaScript |
{{"status":"world",}} | {{"status":"world"}} | Remove trailing comma. | JSON |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
function foo() {{ echo 'result'; }} | function foo() {{ echo 'result'; }} | Correct. | PHP |
'test' + 82 | 'test' + str(82) | Can't add int to string. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
arr(54) | if length(arr) >= 54, arr(54), end | Check length. | MATLAB |
<user><desc>output</desc><age>11</age></user | <user><desc>output</desc><age>11</age></user> | Add closing >. | XML |
int arr[17]; arr[17]=5; | int arr[17]; if(17<17){{}} else arr[17]=5; | Bounds check. | C++ |
status: hello
status: hello, | status: hello
status: hello | Remove comma. | YAML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
let x: i32 = "value"; | let x: &str = "value"; | Type mismatch. | Rust |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
[32, 54, 100 | [32, 54, 100] | Close bracket. | Ruby |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
items.forEach(function(z) {{ console.log(z); }}) | items.forEach((z) => {{ console.log(z); }}) | Arrow functions are cleaner. | JavaScript |
if foo > 58
print('world') | if foo > 58:
print('world') | Colon missing after if. | Python |
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