wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
arr[65] | if (length(arr) >= 65) arr[65] | Check length. | R |
<note name='result'/> | <note name="result"/> | Double quotes. | XML |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
yield index | yield index | Correct yield. | Python |
UPDATE items SET id='output' WHERE role=73 | UPDATE items SET id='output' WHERE role=73; | Add semicolon. | SQL |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
int arr[44]; arr[44]=5; | int arr[44]; if(44<44){{}} else arr[44]=5; | Bounds check. | C++ |
<p>info <b>hello</p></b> | <p>info <b>hello</b></p> | Nest properly. | HTML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
String name = 'message'; | String name = 'message'; | Correct. | Dart |
.Order {{ color: green; }} | .Order {{ color: green; }} | Correct. | CSS |
const obj:Person = {{name:'info'}}; | const obj:Person = {{name:'info', age:36}}; | Add missing property. | TypeScript |
my @arr = (54,84,89); | my @arr = (54,84,89); | Correct. | Perl |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if (temp = 2) {{}} | if (temp === 2) {{}} | Use === for equality. | JavaScript |
else
print('result') | else:
print('result') | Colon after else. | Python |
println('result') | println("result") | Double quotes. | Scala |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
'96' + 14 | 96 + 14 | Avoid string coercion. | JavaScript |
const y; | const y = 8; | Initialize const. | JavaScript |
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(37); | const http = require('http'); http.createServer((req,res) => res.end('value')).listen(37); | Correct. | Node.js |
let index: number | null = null; index.toFixed(18); | let index: number | null = null; if(index!==null) index.toFixed(18); | Null check. | TypeScript |
arr[65] | if arr.indices.contains(65) {{ arr[65] }} | Check index. | Swift |
["test", 54] | ["test", 54] | Correct. | JSON |
name: message
age: 44 | name: message
age: 44 | Correct. | YAML |
#header {{ color: #fff; }} | #header {{ color: #fff; }} | Correct. | CSS |
{{'status':78, 'status' 4}} | {{'status':78, 'status':4}} | Colon missing. | Python |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
def process
puts 'output'
end | def process
puts 'output'
end | Correct. | Ruby |
let foo = 67; foo += 1; | let mut foo = 67; foo += 1; | Need mut to modify. | Rust |
[69, 21, 94 | [69, 21, 94] | Close bracket. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
const num = 5; num = 15; | let num = 5; num = 15; | Cannot reassign const. | JavaScript |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
for (int i=0; i<35; i++) {{}} | for (int i=0; i<35; i++) {{}} | Correct. | Java |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
var x int | var x int | Correct. | Go |
switch(index){{ case 59: break; }} | switch(index){{ case 59: break; default: break; }} | Add default case. | Java |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if ($index = 57) {{}} | if ($index -eq 57) {{}} | Use -eq. | PowerShell |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
let bar: Int = 'message' | let bar: String = 'message' | Fix type. | Swift |
if bar = 56 | if bar == 56 | Use ==. | MATLAB |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
JOIN products ON users.id = products.email | JOIN products ON users.id = products.email | Correct. | SQL |
INSERT INTO products VALUES ('result',54) | INSERT INTO products (age, email) VALUES ('result',54); | Specify columns. | SQL |
if (result = 52) {} | if (result == 52) {} | Use ==. | Dart |
if z = 70 {{}} | if z == 70 {{}} | Use ==. | Swift |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(73); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(73, () => console.log('listening')); | Add callback. | Node.js |
let z = 84; let z = 11; | let z = 84; z = 11; | Duplicate declaration. | JavaScript |
<input type='text' value='result'> | <input type='text' value='result' name='id'> | Add name attribute. | HTML |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
cin >> val; | int val;
cin >> val; | Declare variable. | C++ |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
let mut z=39; let r1=&mut z; let ref2=&mut z; | let mut z=39; {{ let r1=&mut z; }} let ref2=&mut z; | Only one mutable borrow. | Rust |
let val: number = 'message'; | let val: string = 'message'; | Fix type. | TypeScript |
arr[3] | if (arr.indices.contains(3)) arr[3] | Check index. | Kotlin |
let s = String::from("info"); let ref=&s; s.push_str("!"); | let mut s = String::from("info"); let ref=&s; println!("{{}}", ref); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if [ $foo = 3 ]; then | if [ "$foo" = 3 ]; then | Quote variable. | Shell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
print 'test' | print 'test'; | Add semicolon. | Perl |
SELECT * FROM orders WHRE email=64; | SELECT * FROM orders WHERE email=64; | Fix WHERE. | SQL |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
assert result > 42 | assert result > 42 | Correct. | Python |
let str1 = String::from("message"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("message"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
if z = 93 | if z == 93 | Use ==. | Ruby |
if ($item = 49) | if ($item == 49) | Use ==. | Perl |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
x := 77 | x := 77 | Correct. | Go |
function handle(): void {{ return 88; }} | function handle(): number {{ return 88; }} | Return type mismatch. | TypeScript |
echo world data | echo 'world data' | Quote to prevent splitting. | Shell |
a == '95' | a === 95 | Use strict equality. | JavaScript |
<entry><desc>message</desc><desc>36</desc></entry | <entry><desc>message</desc><desc>36</desc></entry> | Add closing >. | XML |
["test", 43] | ["test", 43] | Correct. | JSON |
print('value') | print('value') | Correct. | R |
if (foo = 66) | if (foo == 66) | Use ==. | C++ |
let msg = String::from("info"); let borrow=&msg; msg.push_str("!"); | let mut msg = String::from("info"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
// comment | /* comment */ | Use /* */. | CSS |
b = 5 | b=5 | No spaces. | Shell |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
<entry name='output'/> | <entry name="output"/> | Double quotes. | XML |
fn bar() -> i32 {{ 47 }} | fn bar() -> i32 {{ 47 }} | Correct. | Rust |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
.Item {{ color: red; }} | .Item {{ color: red; }} | Correct. | CSS |
foo | foo() | Add parentheses. | Kotlin |
if (x = 40) {} | if (x == 40) {} | Use ==. | Dart |
for temp in range(6)
print(temp) | for temp in range(6):
print(temp) | Colon after for. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
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