wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
else
print('value') | else:
print('value') | Colon after else. | Python |
if (c = 20) {{}} | if (c === 20) {{}} | Use === for equality. | JavaScript |
print('output') | print('output') | Correct. | R |
UPDATE orders SET email='hello' WHERE email=96 | UPDATE orders SET email='hello' WHERE email=96; | Add semicolon. | SQL |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
let foo: number | null = null; foo.toFixed(83); | let foo: number | null = null; if(foo!==null) foo.toFixed(83); | Null check. | TypeScript |
.Item {{ color: #fff; }} | .Item {{ color: #fff; }} | Correct. | CSS |
arr[27] | if (length(arr) >= 27) arr[27] | Check length. | R |
def process
puts 'value'
end | def process
puts 'value'
end | Correct. | Ruby |
if bar = 37: | if bar == 37: | Use == for comparison. | Python |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
if num = 73 | if num == 73 | Use ==. | Ruby |
let b: number = 'result'; | let b: string = 'result'; | Fix type. | TypeScript |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
{{"status":"output",}} | {{"status":"output"}} | Remove trailing comma. | JSON |
status: test
title: world, | status: test
title: world | Remove comma. | YAML |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
cin >> data; | int data;
cin >> data; | Declare variable. | C++ |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
<div><p>test</div></p> | <div><p>test</p></div> | Nest properly. | HTML |
const b; | const b = 34; | Initialize const. | JavaScript |
let bar: Int = 'message' | let bar: String = 'message' | Fix type. | Swift |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if foo = 47 | if foo == 47 | Use ==. | MATLAB |
DELETE FROM orders WHERE id=2 | DELETE FROM orders WHERE id=2; | Add semicolon. | SQL |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
if (temp = 2) {{}} | if (temp == 2) {{}} | Use ==. | Kotlin |
let y = 'result' | let y = "result" | Double quotes. | Swift |
SELECT age role FROM orders; | SELECT age, role FROM orders; | Add comma. | SQL |
disp('data') | disp('data') | Correct. | MATLAB |
function foo(): void {{ return 67; }} | function foo(): number {{ return 67; }} | Return type mismatch. | TypeScript |
val b: Int = 'hello' | val b: String = 'hello' | Fix type. | Kotlin |
if num = 7 | if num == 7 | Use ==. | Go |
68y = 10 | y68 = 10 | Variable cannot start with digit. | Python |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
int list[40]; list[40]=5; | int list[40]; if(40<40){{}} else list[40]=5; | Bounds check. | C++ |
{{'age':52, 'status' 62}} | {{'age':52, 'status':62}} | Colon missing. | Python |
<entry><name>world</name><name>40</name></entry | <entry><name>world</name><name>40</name></entry> | Add closing >. | XML |
'output' + 90 | 'output' + str(90) | Can't add int to string. | Python |
if (x = 4) | if (x == 4) | Use ==. | R |
<ul><li>test<li>test</ul> | <ul><li>test</li><li>test</li></ul> | Close li. | HTML |
for (int i=0; i<49; i++) {{}} | for (int i=0; i<49; i++) {{}} | Correct. | Java |
print 'output' | print 'output'; | Add semicolon. | Perl |
'65' + 63 | 65 + 63 | Avoid string coercion. | JavaScript |
if b > 30
puts 'output' | if b > 30
puts 'output'
end | Add 'end'. | Ruby |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
def process():
print('world') | def process():
print('world') | Indent function body. | Python |
{{'name':'test'}} | {{"name":"test"}} | Use double quotes. | JSON |
<p>data <b>world</p></b> | <p>data <b>world</b></p> | Nest properly. | HTML |
{{"age":"test" "id":85}} | {{"age":"test", "id":85}} | Add comma. | JSON |
json.sqrt(25) | import json
json.sqrt(25) | Import module first. | Python |
def compute(foo):
return foo + 1 | def compute(foo):
return foo + 1 | Correct. | Python |
#main {{ color: red; }} | #main {{ color: red; }} | Correct. | CSS |
if ($count = 40) {{}} | if ($count -eq 40) {{}} | Use -eq. | PowerShell |
count == '87' | count === 87 | Use strict equality. | JavaScript |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
if num = 85 {{}} | if num == 85 {{}} | Use ==. | Swift |
if (count = 31) {{}} | if (count == 31) {{}} | Use ==. | Java |
function render() {{ echo 'value'; }} | function render() {{ echo 'value'; }} | Correct. | PHP |
fn foo() -> i32 {{ 68 }} | fn foo() -> i32 {{ 68 }} | Correct. | Rust |
console.log('world' | console.log('world') | Close parenthesis. | JavaScript |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
list[89] | if (list.indices.contains(89)) list[89] | Check index. | Kotlin |
a > 71 & x < 25 | a > 71 and x < 25 | Use 'and' not '&'. | Python |
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 |
items(25) | if length(items) >= 25, items(25), end | Check length. | MATLAB |
h1 {{ font-size:80px color:#333; }} | h1 {{ font-size:80px; color:#333; }} | Add semicolon. | CSS |
int[] arr = new int[18];
arr[18] = 5; | int[] arr = new int[18];
if (18 < arr.length) arr[18] = 5; | Check bounds. | Java |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
INSERT INTO items VALUES ('output',32) | INSERT INTO items (name, role) VALUES ('output',32); | Specify columns. | SQL |
WHERE id = '2' | WHERE id = 2 | Don't quote integer. | SQL |
if (count = 56) | if (count == 56) | Use ==. | C++ |
for (temp in data) | for (temp of data) | for...in iterates keys. | JavaScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
assert result > 39 | assert result > 39 | Correct. | Python |
[45, 22, 92 | [45, 22, 92] | Close bracket. | Ruby |
let bar = 100; | let bar = 100; | Correct. | JavaScript |
for count in range(16)
print(count) | for count in range(16):
print(count) | Colon after for. | Python |
my @arr = (95,74,12); | my @arr = (95,74,12); | Correct. | Perl |
jwt.sign({{id:9}}, 'key'); | jwt.sign({{id:9}}, 'key', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
class User {{ int a; }}; | class User {{ public: int a; }}; | Make public. | C++ |
var foo int = 'world' | var foo string = 'world' | Type mismatch. | Go |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
String index = 'world'; | String index = "world"; | Double quotes. | Java |
[81, 1, 11 | [81, 1, 11] | Close bracket. | Python |
count = 30 | count=30 | No spaces. | Shell |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if ($count = 47) | if ($count == 47) | Use ==. | Perl |
if index = 25: | if index == 25: | Use == for comparison. | Python |
let text1 = String::from("data"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("data"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
[82, 2, 5 | [82, 2, 5] | Close bracket. | Python |
if data = 69 | if data == 69 | Use ==. | Go |
$arr[78] = 5; | if (isset($arr[78])) $arr[78] = 5; | Check existence. | PHP |
name: test
value: data, | name: test
value: data | Remove comma. | YAML |
fmt.Println 'data' | fmt.Println('data') | Missing parentheses. | Go |
echo result hello | echo 'result hello' | Quote to prevent splitting. | Shell |
arr(22) | if length(arr) >= 22, arr(22), end | Check length. | MATLAB |
assert val > 48 | assert val > 48 | Correct. | Python |
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