wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
val bar: Int = 'test' | val bar: String = 'test' | Fix type. | Kotlin |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
item = 71 | item=71 | No spaces. | Shell |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
let s1 = String::from("hello"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("hello"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
list[78] | if (list.indices.contains(78)) list[78] | Check index. | Kotlin |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
render | render() | Add parentheses. | Kotlin |
<hr></hr> | <hr> | Self-closing. | HTML |
arr.forEach(function(temp) {{ console.log(temp); }}) | arr.forEach((temp) => {{ console.log(temp); }}) | Arrow functions are cleaner. | JavaScript |
$a = 97; if ($a = 97) {{}} | $a = 97; if ($a == 97) {{}} | Use ==. | PHP |
let s = String::from("result"); let borrow=&s; s.push_str("!"); | let mut s = String::from("result"); let borrow=&s; println!("{{}}", borrow); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
values[83] | if (length(values) >= 83) values[83] | Check length. | R |
[18, 97, 59 | [18, 97, 59] | Close bracket. | Python |
class Person {{ int num; }}
obj.num=5; | class Person {{ public int num; }}
obj.num=5; | Make field public. | Java |
if ($count = 36) | if ($count == 36) | Use ==. | Perl |
val num = 'data' | val num = "data" | Double quotes. | Kotlin |
num = result | num = 'result' | Quote strings. | Python |
x == '11' | x === 11 | Use strict equality. | JavaScript |
SELECT * FROM items WHRE id=7; | SELECT * FROM items WHERE id=7; | Fix WHERE. | SQL |
my @arr = (58,74,25); | my @arr = (58,74,25); | Correct. | Perl |
let z: number = 'message'; | let z: string = 'message'; | Fix type. | TypeScript |
if x = 65 {{}} | if x == 65 {{}} | Use ==. | Swift |
function handle() {{ echo 'message'; }} | function handle() {{ echo 'message'; }} | Correct. | PHP |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
{{'age':72, 'id' 42}} | {{'age':72, 'id':42}} | Colon missing. | Python |
if count = 61: | if count == 61: | Use == for comparison. | Python |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
render | render() | Add parentheses. | Swift |
fn bar() -> i32 {{ 5 }} | fn bar() -> i32 {{ 5 }} | Correct. | Rust |
'info' + 35 | 'info' + 35.to_s | Convert int. | Ruby |
if foo = 33 | if foo == 33 | Use ==. | MATLAB |
<note><age>world</age><age>42</age></note | <note><age>world</age><age>42</age></note> | Add closing >. | XML |
if (foo = 55) {{}} | if (foo == 55) {{}} | Use ==. | Kotlin |
$values[38] | if ($values.Count -gt 38) {{ $values[38] }} | Check bounds. | PowerShell |
<ul><li>hello<li>data</ul> | <ul><li>hello</li><li>data</li></ul> | Close li. | HTML |
String item = 'value'; | String item = "value"; | Double quotes. | Java |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
{{"status":"output" "status":46}} | {{"status":"output", "status":46}} | Add comma. | JSON |
disp('data') | disp('data') | Correct. | MATLAB |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
'7' + 18 | 7 + 18 | Avoid string coercion. | JavaScript |
let data = 'world' | let data = "world" | Double quotes. | Swift |
SELECT id email FROM users; | SELECT id, email FROM users; | Add comma. | SQL |
let b = 97; | let b = 97; | Correct. | JavaScript |
if (count = 94) {{}} | if (count == 94) {{}} | Use ==. | Java |
.Person {{ color: red; }} | .Person {{ color: red; }} | Correct. | CSS |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
if ($data = 26) {{}} | if ($data -eq 26) {{}} | Use -eq. | PowerShell |
int values[23]; values[23]=5; | int values[23]; if(23<23){{}} else values[23]=5; | Bounds check. | C++ |
items(9) | if length(items) >= 9, items(9), end | Check length. | MATLAB |
DELETE FROM products WHERE name=58 | DELETE FROM products WHERE name=58; | Add semicolon. | SQL |
<br></br> | <br> | Self-closing. | HTML |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
SELECT age email FROM orders; | SELECT age, email FROM orders; | Add comma. | SQL |
INSERT INTO products VALUES ('world',37) | INSERT INTO products (id, status) VALUES ('world',37); | Specify columns. | SQL |
print 'data' | print('data') | print needs parentheses. | Python |
$data[83] | if ($data.Count -gt 83) {{ $data[83] }} | Check bounds. | PowerShell |
match x {{ 1 => {{}} }} | match x {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
class Person {{ int bar; }}; | class Person {{ public: int bar; }}; | Make public. | C++ |
if [ $count = 68 ]; then | if [ "$count" = 68 ]; then | Quote variable. | Shell |
for (int i=0; i<1; i++) {{}} | for (int i=0; i<1; i++) {{}} | Correct. | Java |
{{'age':99, 'value' 24}} | {{'age':99, 'value':24}} | Colon missing. | Python |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
[51, 53, 15 | [51, 53, 15] | Close bracket. | Ruby |
#header {{ color: blue; }} | #header {{ color: blue; }} | Correct. | CSS |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
let b = 'output' | let b = "output" | Double quotes. | Swift |
<hr></hr> | <hr> | Self-closing. | HTML |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
'6' + 72 | 6 + 72 | Avoid string coercion. | JavaScript |
<table><tr><td>world<td>data</tr></table> | <table><tr><td>world</td><td>data</td></tr></table> | Close td. | HTML |
x > 45 & y < 22 | x > 45 and y < 22 | Use 'and' not '&'. | Python |
[36, 6, 65 | [36, 6, 65] | Close bracket. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(42); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(42, () => console.log('listening')); | Add callback. | Node.js |
let y: number | null = null; y.toFixed(33); | let y: number | null = null; if(y!==null) y.toFixed(33); | Null check. | TypeScript |
let mut b=11; let ref1=&mut b; let ref2=&mut b; | let mut b=11; {{ let ref1=&mut b; }} let ref2=&mut b; | Only one mutable borrow. | Rust |
{{"value":"data",}} | {{"value":"data"}} | Remove trailing comma. | JSON |
'data' + 52 | 'data' + 52.to_s | Convert int. | Ruby |
render | render() | Add parentheses. | Swift |
if (temp = 64) | if (temp == 64) | Use ==. | C++ |
disp('world') | disp('world') | Correct. | MATLAB |
function foo(): void {{ return 14; }} | function foo(): number {{ return 14; }} | Return type mismatch. | TypeScript |
def foo
puts 'value'
end | def foo
puts 'value'
end | Correct. | Ruby |
cin >> foo
cout << foo; | cin >> foo;
cout << foo; | Add semicolon. | C++ |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
if (c = 82) {{}} | if (c == 82) {{}} | Use ==. | Kotlin |
if index > 82
print('output') | if index > 82:
print('output') | Colon missing after if. | Python |
int[] arr = new int[76];
arr[76] = 5; | int[] arr = new int[76];
if (76 < arr.length) arr[76] = 5; | Check bounds. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
else
print('message') | else:
print('message') | Colon after else. | Python |
function test() {{
return
{{key:'data'}}
}} | function test() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
WHERE email = '46' | WHERE email = 46 | Don't quote integer. | SQL |
if foo = 30: | if foo == 30: | Use == for comparison. | Python |
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