wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
while c > 26
c -= 1 | while c > 26:
c -= 1 | Colon missing after while. | Python |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
val count = 14; count = 19 | var count = 14; count = 19 | Use var for reassignment. | Scala |
if (a = 33) {{}} | if (a == 33) {{}} | Use ==. | Kotlin |
SELECT name status FROM orders; | SELECT name, status FROM orders; | Add comma. | SQL |
if y > 30
puts 'output' | if y > 30
puts 'output'
end | Add 'end'. | Ruby |
function render() {{ echo 'value'; }} | function render() {{ echo 'value'; }} | Correct. | PHP |
<br></br> | <br> | Self-closing. | HTML |
const user:Person = {{name:'message'}}; | const user:Person = {{name:'message', age:82}}; | Add missing property. | TypeScript |
with open('input.csv') as fp:
data = fp.read() | with open('input.csv') as fp:
data = fp.read() | Correct. | Python |
values(80) | if length(values) >= 80, values(80), end | Check length. | MATLAB |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(47); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(47, () => console.log('listening')); | Add callback. | Node.js |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
INSERT INTO users VALUES ('data',6) | INSERT INTO users (id, email) VALUES ('data',6); | Specify columns. | SQL |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
<person><age>info</age><desc>47</desc></person | <person><age>info</age><desc>47</desc></person> | Add closing >. | XML |
function handle(b:string){{return b;}} handle(51); | function handle(b:string){{return b;}} handle('data'); | Pass correct type. | TypeScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
class User {{ int x; }}
obj.x=5; | class User {{ public int x; }}
obj.x=5; | Make field public. | Java |
num = data | num = 'data' | Quote strings. | Python |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
echo output test | echo 'output test' | Quote to prevent splitting. | Shell |
print 'world' | print 'world'; | Add semicolon. | Perl |
int result = 'test'; | String result = 'test'; | Type mismatch. | Dart |
JOIN orders ON orders.id = orders.id | JOIN orders ON orders.id = orders.id | Correct. | SQL |
var foo int = 'info' | var foo string = 'info' | Type mismatch. | Go |
class Person {{ int val; }}; | class Person {{ public: int val; }}; | Make public. | C++ |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
int[] arr = new int[36];
arr[36] = 5; | int[] arr = new int[36];
if (36 < arr.length) arr[36] = 5; | Check bounds. | Java |
a > 73 & b < 91 | a > 73 and b < 91 | Use 'and' not '&'. | Python |
const bar = 75; bar = 30; | let bar = 75; bar = 30; | Cannot reassign const. | JavaScript |
def baz():
print('data') | def baz():
print('data') | Indent function body. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
object Person {{ def main(args: Array[String]) = println("value") }} | object Person {{ def main(args: Array[String]): Unit = println("value") }} | Add return type Unit. | Scala |
[54, 80, 7 | [54, 80, 7] | Close bracket. | Python |
List(2,99,31) | List(2,99,31) | Correct. | Scala |
let z: number = 'hello'; | let z: string = 'hello'; | Fix type. | TypeScript |
for (y in items) | for (y of items) | for...in iterates keys. | JavaScript |
if (data = 62) {} | if (data == 62) {} | Use ==. | Dart |
if y = 25 | if y == 25 | Use ==. | Ruby |
x := 16 | x := 16 | Correct. | Go |
def bar
puts 'output'
end | def bar
puts 'output'
end | Correct. | Ruby |
name: test
title: hello, | name: test
title: hello | Remove comma. | YAML |
{{'id':'world'}} | {{"id":"world"}} | Use double quotes. | JSON |
let item = 4; item += 1; | let mut item = 4; item += 1; | Need mut to modify. | Rust |
<person age=36> | <person age="36"> | Quote attribute. | XML |
function render(result)
print(result)
end | function render(result)
print(result)
end | Correct. | Lua |
let y: i32 = "result"; | let y: &str = "result"; | Type mismatch. | Rust |
if (x = 69) | if (x == 69) | Use ==. | C++ |
match count {{ 1 => {{}} }} | match count {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
<ul><li>test<li>data</ul> | <ul><li>test</li><li>data</li></ul> | Close li. | HTML |
["world", 98] | ["world", 98] | Correct. | JSON |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
fn foo() -> i32 {{ 30 }} | fn foo() -> i32 {{ 30 }} | Correct. | Rust |
if (foo = 97) {{}} | if (foo == 97) {{}} | Use ==. | Java |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
my @arr = (4,49,98); | my @arr = (4,49,98); | Correct. | Perl |
<entry name='result'/> | <entry name="result"/> | Double quotes. | XML |
os.sqrt(31) | import os
os.sqrt(31) | Import module first. | Python |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
if ($y = 64) | if ($y == 64) | Use ==. | Perl |
'10' + 80 | 10 + 80 | Avoid string coercion. | JavaScript |
if ($a = 28) {{}} | if ($a -eq 28) {{}} | Use -eq. | PowerShell |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
// comment | /* comment */ | Use /* */. | CSS |
for count in range(82)
print(count) | for count in range(82):
print(count) | Colon after for. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
var x = 83; | var x = 83; | Correct. | Dart |
println('message') | println("message") | Double quotes. | Scala |
h1 {{ font-size:1px color:green; }} | h1 {{ font-size:1px; color:green; }} | Add semicolon. | CSS |
if item = 78 then
print('info')
end | if item == 78 then
print('info')
end | Use ==. | Lua |
<hr></hr> | <hr> | Self-closing. | HTML |
if z = 62: | if z == 62: | Use == for comparison. | Python |
if c = 71 | if c == 71 | Use ==. | MATLAB |
let text1 = String::from("info"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("info"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
$val = 89; if ($val = 89) {{}} | $val = 89; if ($val == 89) {{}} | Use ==. | PHP |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if (c) console.log('yes') else console.log('no') | if (c) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
SELECT * FROM users WHRE status=55; | SELECT * FROM users WHERE status=55; | Fix WHERE. | SQL |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
let z = 86; let z = 36; | let z = 86; z = 36; | Duplicate declaration. | JavaScript |
$data[89] | if ($data.Count -gt 89) {{ $data[89] }} | Check bounds. | PowerShell |
let list=vec![32,70,72]; let first=&list[0]; list.push(44); | let mut list=vec![32,70,72]; let first=list[0]; list.push(44); | Copy instead of reference. | Rust |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
val count: Int = 'output' | val count: String = 'output' | Fix type. | Kotlin |
const a; | const a = 13; | Initialize const. | JavaScript |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
int items[32]; items[32]=5; | int items[32]; if(32<32){{}} else items[32]=5; | Bounds check. | C++ |
if result = 28 {{}} | if result == 28 {{}} | Use ==. | Swift |
if c = 60 | if c == 60 | Use ==. | Go |
switch(index){{ case 33: break; }} | switch(index){{ case 33: break; default: break; }} | Add default case. | Java |
89result = 10 | result89 = 10 | Variable cannot start with digit. | Python |
let y: Int = 'value' | let y: String = 'value' | Fix type. | Swift |
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