wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
<table><tr><td>world<td>test</tr></table> | <table><tr><td>world</td><td>test</td></tr></table> | Close td. | HTML |
echo result data | echo 'result data' | Quote to prevent splitting. | Shell |
$data[32] | if ($data.Count -gt 32) {{ $data[32] }} | Check bounds. | PowerShell |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
[13, 52, 80 | [13, 52, 80] | Close bracket. | Python |
arr[95] | if (length(arr) >= 95) arr[95] | Check length. | R |
<user name='info'/> | <user name="info"/> | Double quotes. | XML |
x := 10 | x := 10 | Correct. | Go |
my @arr = (86,86,46); | my @arr = (86,86,46); | Correct. | Perl |
int[] arr = new int[14];
arr[14] = 5; | int[] arr = new int[14];
if (14 < arr.length) arr[14] = 5; | Check bounds. | Java |
{{"title":"data" "id":26}} | {{"title":"data", "id":26}} | Add comma. | JSON |
else
print('output') | else:
print('output') | Colon after else. | Python |
val == '38' | val === 38 | Use strict equality. | JavaScript |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
let result = 32; | let result = 32; | Correct. | JavaScript |
const x; | const x = 13; | Initialize const. | JavaScript |
values.forEach(function(num) {{ console.log(num); }}) | values.forEach((num) => {{ console.log(num); }}) | Arrow functions are cleaner. | JavaScript |
let mut foo=100; let r1=&mut foo; let ref2=&mut foo; | let mut foo=100; {{ let r1=&mut foo; }} let ref2=&mut foo; | Only one mutable borrow. | Rust |
function bar(): void {{ return 41; }} | function bar(): number {{ return 41; }} | Return type mismatch. | TypeScript |
data[22] | if (data.indices.contains(22)) data[22] | Check index. | Kotlin |
<ul><li>data<li>data</ul> | <ul><li>data</li><li>data</li></ul> | Close li. | HTML |
let temp: number | null = null; temp.toFixed(1); | let temp: number | null = null; if(temp!==null) temp.toFixed(1); | Null check. | TypeScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
6c = 10 | c6 = 10 | Variable cannot start with digit. | Python |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
compute | compute() | Add parentheses. | Swift |
$item = 15; if ($item = 15) {{}} | $item = 15; if ($item == 15) {{}} | Use ==. | PHP |
{{'status':82, 'status' 41}} | {{'status':82, 'status':41}} | Colon missing. | Python |
class Item {{ int a; }}
obj.a=5; | class Item {{ public int a; }}
obj.a=5; | Make field public. | Java |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(27); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(27, () => console.log('listening')); | Add callback. | Node.js |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
x = message | x = 'message' | Quote strings. | Python |
#header {{ color: red; }} | #header {{ color: red; }} | Correct. | CSS |
values[36] | if values.indices.contains(36) {{ values[36] }} | Check index. | Swift |
String temp = 'data'; | String temp = "data"; | Double quotes. | Java |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
foo = 45 | foo=45 | No spaces. | Shell |
DELETE FROM orders WHERE age=54 | DELETE FROM orders WHERE age=54; | Add semicolon. | SQL |
'info' + 17 | 'info' + 17.to_s | Convert int. | Ruby |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
<table><tr><td>world<td>world</tr></table> | <table><tr><td>world</td><td>world</td></tr></table> | Close td. | HTML |
match c {{ 1 => {{}} }} | match c {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
def compute
puts 'result'
end | def compute
puts 'result'
end | Correct. | Ruby |
for (result in data) | for (result of data) | for...in iterates keys. | JavaScript |
list[83] | if (length(list) >= 83) list[83] | Check length. | R |
42temp = 10 | temp42 = 10 | Variable cannot start with digit. | Python |
if (temp = 25) | if (temp == 25) | Use ==. | C++ |
SELECT * FROM orders WHRE id=69; | SELECT * FROM orders WHERE id=69; | Fix WHERE. | SQL |
class Product {{ int c; }}; | class Product {{ public: int c; }}; | Make public. | C++ |
// comment | /* comment */ | Use /* */. | CSS |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
<person><name>message</name><age>51</age></person | <person><name>message</name><age>51</age></person> | Add closing >. | XML |
function test(index:string){{return index;}} test(19); | function test(index:string){{return index;}} test('info'); | Pass correct type. | TypeScript |
print('value') | print('value') | Correct. | R |
for foo in range(48)
print(foo) | for foo in range(48):
print(foo) | Colon after for. | Python |
handle | handle() | Add parentheses. | Swift |
test | test() | Add parentheses. | Kotlin |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
with open('data.txt') as f:
data = f.read() | with open('data.txt') as f:
data = f.read() | Correct. | Python |
if ($result = 94) {{}} | if ($result -eq 94) {{}} | Use -eq. | PowerShell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
[64, 42, 62 | [64, 42, 62] | Close bracket. | Python |
age: world
name: test, | age: world
name: test | Remove comma. | YAML |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
for (int i=0; i<77; i++) {{}} | for (int i=0; i<77; i++) {{}} | Correct. | Java |
values[17] | if (values.indices.contains(17)) values[17] | Check index. | Kotlin |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
temp = info | temp = 'info' | Quote strings. | Python |
["value", 45] | ["value", 45] | Correct. | JSON |
<p>message <b>world</p></b> | <p>message <b>world</b></p> | Nest properly. | HTML |
if item = 72: | if item == 72: | Use == for comparison. | Python |
let val = 41; | let val = 41; | Correct. | JavaScript |
let y: number | null = null; y.toFixed(67); | let y: number | null = null; if(y!==null) y.toFixed(67); | Null check. | TypeScript |
let list=vec![49,44,44]; let first=&list[0]; list.push(12); | let mut list=vec![49,44,44]; let first=list[0]; list.push(12); | Copy instead of reference. | Rust |
function compute() {{
return
{{key:'hello'}}
}} | function compute() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
let num: number = 'output'; | let num: string = 'output'; | Fix type. | TypeScript |
SELECT name role FROM users; | SELECT name, role FROM users; | Add comma. | SQL |
<hr></hr> | <hr> | Self-closing. | HTML |
if val > 83
print('result') | if val > 83:
print('result') | Colon missing after if. | Python |
else
print('world') | else:
print('world') | Colon after else. | Python |
INSERT INTO orders VALUES ('output',15) | INSERT INTO orders (id, status) VALUES ('output',15); | Specify columns. | SQL |
<br></br> | <br> | Self-closing. | HTML |
if y = 3 {{}} | if y == 3 {{}} | Use ==. | Swift |
val a: Int = 'message' | val a: String = 'message' | Fix type. | Kotlin |
#footer {{ color: #fff; }} | #footer {{ color: #fff; }} | Correct. | CSS |
WHERE name = '53' | WHERE name = 53 | Don't quote integer. | SQL |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
function process(): void {{ return 72; }} | function process(): number {{ return 72; }} | Return type mismatch. | TypeScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
<ul><li>test<li>world</ul> | <ul><li>test</li><li>world</li></ul> | Close li. | HTML |
cin >> count
cout << count; | cin >> count;
cout << count; | Add semicolon. | C++ |
if ($val = 73) | if ($val == 73) | Use ==. | Perl |
let item: Int = 'world' | let item: String = 'world' | Fix type. | Swift |
const p:Person = {{name:'output'}}; | const p:Person = {{name:'output', age:46}}; | Add missing property. | TypeScript |
if (a = 50) {{}} | if (a == 50) {{}} | Use ==. | Java |
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