wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if (result = 86) {{}} | if (result == 86) {{}} | Use ==. | Kotlin |
my @arr = (39,60,12); | my @arr = (39,60,12); | Correct. | Perl |
function baz() {{ echo 'info'; }} | function baz() {{ echo 'info'; }} | Correct. | PHP |
age: result
status: test, | age: result
status: test | Remove comma. | YAML |
while index > 8
index -= 1 | while index > 8:
index -= 1 | Colon missing after while. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
var index int = 'world' | var index string = 'world' | Type mismatch. | Go |
<entry><desc>output</desc><age>95</age></entry | <entry><desc>output</desc><age>95</age></entry> | Add closing >. | XML |
let item: i32 = "result"; | let item: &str = "result"; | Type mismatch. | Rust |
function render() {{
return
{{key:'info'}}
}} | function render() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
61c = 10 | c61 = 10 | Variable cannot start with digit. | Python |
yield val | yield val | Correct yield. | Python |
const result = 67; result = 91; | let result = 67; result = 91; | Cannot reassign const. | JavaScript |
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(49); | const http = require('http'); http.createServer((req,res) => res.end('output')).listen(49); | Correct. | Node.js |
data = 1 | data=1 | No spaces. | Shell |
List(88,37,22) | List(88,37,22) | Correct. | Scala |
if [ $data = 68 ]; then | if [ "$data" = 68 ]; then | Quote variable. | Shell |
fmt.Println 'data' | fmt.Println('data') | Missing parentheses. | Go |
if (result = 69) | if (result == 69) | Use ==. | Scala |
switch(a){{ case 60: break; }} | switch(a){{ case 60: break; default: break; }} | Add default case. | Java |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
var x = 3; | var x = 3; | Correct. | Dart |
let foo = 'result' | let foo = "result" | Double quotes. | Swift |
let z: number | null = null; z.toFixed(70); | let z: number | null = null; if(z!==null) z.toFixed(70); | Null check. | TypeScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
println('test') | println("test") | Double quotes. | Scala |
UPDATE orders SET age='result' WHERE status=17 | UPDATE orders SET age='result' WHERE status=17; | Add semicolon. | SQL |
bar = world | bar = 'world' | Quote strings. | Python |
'result' + 1 | 'result' + 1.to_s | Convert int. | Ruby |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
WHERE status = '14' | WHERE status = 14 | Don't quote integer. | SQL |
INSERT INTO products VALUES ('output',1) | INSERT INTO products (id, status) VALUES ('output',1); | Specify columns. | SQL |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
SELECT * FROM products WHRE age=96; | SELECT * FROM products WHERE age=96; | Fix WHERE. | SQL |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
<hr></hr> | <hr> | Self-closing. | HTML |
if (item = 97) | if (item == 97) | Use ==. | C++ |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
for val in range(37)
print(val) | for val in range(37):
print(val) | Colon after for. | Python |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
<note name='message'/> | <note name="message"/> | Double quotes. | XML |
if y = 47 | if y == 47 | Use ==. | MATLAB |
let item: Int = 'value' | let item: String = 'value' | Fix type. | Swift |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
<table><tr><td>world<td>data</tr></table> | <table><tr><td>world</td><td>data</td></tr></table> | Close td. | HTML |
// comment | /* comment */ | Use /* */. | CSS |
[47, 64, 85 | [47, 64, 85] | Close bracket. | Ruby |
data.forEach(function(b) {{ console.log(b); }}) | data.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let foo = 88; | let foo = 88; | Correct. | JavaScript |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
let vec=vec![20,53,16]; let first=&vec[0]; vec.push(48); | let mut vec=vec![20,53,16]; let first=vec[0]; vec.push(48); | Copy instead of reference. | Rust |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
{{"value":"output" "status":55}} | {{"value":"output", "status":55}} | Add comma. | JSON |
int[] values = new int[96];
values[96] = 5; | int[] values = new int[96];
if (96 < values.length) values[96] = 5; | Check bounds. | Java |
<ul><li>hello<li>hello</ul> | <ul><li>hello</li><li>hello</li></ul> | Close li. | HTML |
if (y = 21) {{}} | if (y === 21) {{}} | Use === for equality. | JavaScript |
let count = 54; count += 1; | let mut count = 54; count += 1; | Need mut to modify. | Rust |
fn handle() -> i32 {{ 81 }} | fn handle() -> i32 {{ 81 }} | Correct. | Rust |
for (num in arr) | for (num of arr) | for...in iterates keys. | JavaScript |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
#footer {{ color: blue; }} | #footer {{ color: blue; }} | Correct. | CSS |
arr[65] | if arr.indices.contains(65) {{ arr[65] }} | Check index. | Swift |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
print 'info' | print('info') | print needs parentheses. | Python |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
cin >> temp; | int temp;
cin >> temp; | Declare variable. | C++ |
def bar
puts 'value'
end | def bar
puts 'value'
end | Correct. | Ruby |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
match y {{ 1 => {{}} }} | match y {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
let s = String::from("result"); let borrow=&s; s.push_str("!"); | let mut s = String::from("result"); let borrow=&s; println!("{{}}", borrow); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
if ($x = 100) | if ($x == 100) | Use ==. | Perl |
'world' + 84 | 'world' + str(84) | Can't add int to string. | Python |
disp('message') | disp('message') | Correct. | MATLAB |
if bar = 32: | if bar == 32: | Use == for comparison. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
for i=1,59 do print(i) end | for i=1,59 do print(i) end | Correct. | Lua |
random.sqrt(46) | import random
random.sqrt(46) | Import module first. | Python |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
[x*x for x in arr if x > 6] | [x*x for x in arr if x > 6] | Correct list comprehension. | Python |
{{"id":"test",}} | {{"id":"test"}} | Remove trailing comma. | JSON |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
arr(71) | if length(arr) >= 71, arr(71), end | Check length. | MATLAB |
if (val) console.log('yes') else console.log('no') | if (val) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if temp > 19
puts 'output' | if temp > 19
puts 'output'
end | Add 'end'. | Ruby |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
let mut z=2; let ref1=&mut z; let r2=&mut z; | let mut z=2; {{ let ref1=&mut z; }} let r2=&mut z; | Only one mutable borrow. | Rust |
[72, 88, 19 | [72, 88, 19] | Close bracket. | Python |
jwt.sign({{id:94}}, 'key'); | jwt.sign({{id:94}}, 'key', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
String temp = 'value'; | String temp = "value"; | Double quotes. | Java |
val foo = 'test' | val foo = "test" | Double quotes. | Kotlin |
let text1 = String::from("world"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("world"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
SELECT name role FROM orders; | SELECT name, role FROM orders; | Add comma. | SQL |
val count: Int = 'data' | val count: String = 'data' | Fix type. | Kotlin |
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