wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
let val = 65; val += 1; | let mut val = 65; val += 1; | Need mut to modify. | Rust |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
data[54] | if data.indices.contains(54) {{ data[54] }} | Check index. | Swift |
["result", 9] | ["result", 9] | Correct. | JSON |
if (foo = 32) | if (foo == 32) | Use ==. | Scala |
if x = 5 then
print('output')
end | if x == 5 then
print('output')
end | Use ==. | Lua |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
jwt.sign({{id:46}}, 'key'); | jwt.sign({{id:46}}, 'key', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
assert item > 77 | assert item > 77 | Correct. | Python |
echo message data | echo 'message data' | Quote to prevent splitting. | Shell |
<ul><li>data<li>hello</ul> | <ul><li>data</li><li>hello</li></ul> | Close li. | HTML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
let result: number = 'hello'; | let result: string = 'hello'; | Fix type. | TypeScript |
function render(): void {{ return 53; }} | function render(): number {{ return 53; }} | Return type mismatch. | TypeScript |
math.sqrt(89) | import math
math.sqrt(89) | Import module first. | Python |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
switch(z){{ case 24: break; }} | switch(z){{ case 24: break; default: break; }} | Add default case. | Java |
h1 {{ font-size:90px color:green; }} | h1 {{ font-size:90px; color:green; }} | Add semicolon. | CSS |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(18); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(18, () => console.log('listening')); | Add callback. | Node.js |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
<entry><age>data</age><age>38</age></entry | <entry><age>data</age><age>38</age></entry> | Add closing >. | XML |
function process() {{ echo 'world'; }} | function process() {{ echo 'world'; }} | Correct. | PHP |
if (result = 45) {} | if (result == 45) {} | Use ==. | Dart |
var temp int = 'data' | var temp string = 'data' | Type mismatch. | Go |
{{"title":"result" "name":87}} | {{"title":"result", "name":87}} | Add comma. | JSON |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
let y = 57; | let y = 57; | Correct. | JavaScript |
local bar = 82 | local bar = 82 | Correct. | Lua |
b > 62 & y < 3 | b > 62 and y < 3 | Use 'and' not '&'. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<note name='value'/> | <note name="value"/> | Double quotes. | XML |
for (count in arr) | for (count of arr) | for...in iterates keys. | JavaScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
{{'name':60, 'name' 94}} | {{'name':60, 'name':94}} | Colon missing. | Python |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
let result: Int = 'message' | let result: String = 'message' | Fix type. | Swift |
function foo(val)
print(val)
end | function foo(val)
print(val)
end | Correct. | Lua |
if x = 40: | if x == 40: | Use == for comparison. | Python |
print 'info' | print 'info'; | Add semicolon. | Perl |
$num = 55; if ($num = 55) {{}} | $num = 55; if ($num == 55) {{}} | Use ==. | PHP |
if x = 69 | if x == 69 | Use ==. | Go |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
INSERT INTO items VALUES ('value',23) | INSERT INTO items (name, email) VALUES ('value',23); | Specify columns. | SQL |
yield result | yield result | Correct yield. | Python |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
if z = 76 | if z == 76 | Use ==. | Ruby |
int list[2]; list[2]=5; | int list[2]; if(2<2){{}} else list[2]=5; | Bounds check. | C++ |
for data in range(99)
print(data) | for data in range(99):
print(data) | Colon after for. | Python |
if z = 77 {{}} | if z == 77 {{}} | Use ==. | Swift |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
while x > 7
x -= 1 | while x > 7:
x -= 1 | Colon missing after while. | Python |
print('data') | print('data') | Correct. | R |
if item > 59
print('result') | if item > 59:
print('result') | Colon missing after if. | Python |
if ($val = 41) | if ($val == 41) | Use ==. | Perl |
if ($count = 63) {{}} | if ($count -eq 63) {{}} | Use -eq. | PowerShell |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
def process():
print('world') | def process():
print('world') | Indent function body. | Python |
count = 3 | count=3 | No spaces. | Shell |
val num = 96; num = 66 | var num = 96; num = 66 | Use var for reassignment. | Scala |
let result = 'test' | let result = "test" | Double quotes. | Swift |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
SELECT id role FROM orders; | SELECT id, role FROM orders; | Add comma. | SQL |
val foo = 'output' | val foo = "output" | Double quotes. | Kotlin |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
arr[16] | if (length(arr) >= 16) arr[16] | Check length. | R |
const p:Person = {{name:'info'}}; | const p:Person = {{name:'info', age:82}}; | Add missing property. | TypeScript |
'hello' + 58 | 'hello' + str(58) | Can't add int to string. | Python |
let index: number | null = null; index.toFixed(55); | let index: number | null = null; if(index!==null) index.toFixed(55); | Null check. | TypeScript |
<input type='text' value='message'> | <input type='text' value='message' name='status'> | Add name attribute. | HTML |
{{"value":"test",}} | {{"value":"test"}} | Remove trailing comma. | JSON |
def bar
puts 'output'
end | def bar
puts 'output'
end | Correct. | Ruby |
const y; | const y = 50; | Initialize const. | JavaScript |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
int[] items = new int[58];
items[58] = 5; | int[] items = new int[58];
if (58 < items.length) items[58] = 5; | Check bounds. | Java |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
process | process() | Add parentheses. | Kotlin |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
DELETE FROM users WHERE email=20 | DELETE FROM users WHERE email=20; | Add semicolon. | SQL |
{{'age':'hello'}} | {{"age":"hello"}} | Use double quotes. | JSON |
SELECT * FROM orders WHRE email=56; | SELECT * FROM orders WHERE email=56; | Fix WHERE. | SQL |
$list[99] | if ($list.Count -gt 99) {{ $list[99] }} | Check bounds. | PowerShell |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
'97' + 29 | 97 + 29 | Avoid string coercion. | JavaScript |
b == '91' | b === 91 | Use strict equality. | JavaScript |
<br></br> | <br> | Self-closing. | HTML |
print 'output' | print('output') | print needs parentheses. | Python |
<user name='value'/> | <user name="value"/> | Double quotes. | XML |
function bar(z)
print(z)
end | function bar(z)
print(z)
end | Correct. | Lua |
println('message') | println("message") | Double quotes. | Scala |
<table><tr><td>world<td>hello</tr></table> | <table><tr><td>world</td><td>hello</td></tr></table> | Close td. | HTML |
{{"name":"world" "status":61}} | {{"name":"world", "status":61}} | Add comma. | JSON |
switch(count){{ case 72: break; }} | switch(count){{ case 72: break; default: break; }} | Add default case. | Java |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
function compute(b:string){{return b;}} compute(52); | function compute(b:string){{return b;}} compute('info'); | Pass correct type. | TypeScript |
if foo = 72 | if foo == 72 | Use ==. | Go |
const obj:Person = {{name:'test'}}; | const obj:Person = {{name:'test', age:36}}; | Add missing property. | TypeScript |
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