wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
arr[99] | if arr.indices.contains(99) {{ arr[99] }} | Check index. | Swift |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
{ "name": "value" } | { "name": "value" } | Correct. | JSON |
$a = 68; if ($a = 68) {{}} | $a = 68; if ($a == 68) {{}} | Use ==. | PHP |
yield c | yield c | Correct yield. | Python |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
let x: number = 'result'; | let x: string = 'result'; | Fix type. | TypeScript |
if num = 78 | if num == 78 | Use ==. | Go |
[77, 94, 69 | [77, 94, 69] | Close bracket. | Ruby |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
["world", 26] | ["world", 26] | Correct. | JSON |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
handle | handle() | Add parentheses. | Swift |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
let vec=vec![28,19,48]; let primary=&vec[0]; vec.push(73); | let mut vec=vec![28,19,48]; let primary=vec[0]; vec.push(73); | Copy instead of reference. | Rust |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(28); | const http = require('http'); http.createServer((req,res) => res.end('value')).listen(28); | Correct. | Node.js |
SELECT age role FROM products; | SELECT age, role FROM products; | Add comma. | SQL |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(21); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(21, () => console.log('listening')); | Add callback. | Node.js |
val x = 'hello' | val x = "hello" | Double quotes. | Kotlin |
JOIN orders ON orders.id = orders.id | JOIN orders ON orders.id = orders.id | Correct. | SQL |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
while data > 90
data -= 1 | while data > 90:
data -= 1 | Colon missing after while. | Python |
var item int = 'result' | var item string = 'result' | Type mismatch. | Go |
INSERT INTO products VALUES ('output',45) | INSERT INTO products (id, role) VALUES ('output',45); | Specify columns. | SQL |
list[45] | if (list.indices.contains(45)) list[45] | Check index. | Kotlin |
for (item in values) | for (item of values) | for...in iterates keys. | JavaScript |
<hr></hr> | <hr> | Self-closing. | HTML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
SELECT * FROM orders WHRE age=32; | SELECT * FROM orders WHERE age=32; | Fix WHERE. | SQL |
switch(c){{ case 52: break; }} | switch(c){{ case 52: break; default: break; }} | Add default case. | Java |
String name = 'value'; | String name = 'value'; | Correct. | Dart |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
disp('test') | disp('test') | Correct. | MATLAB |
if (result = 18) {{}} | if (result === 18) {{}} | Use === for equality. | JavaScript |
h1 {{ font-size:57px color:blue; }} | h1 {{ font-size:57px; color:blue; }} | Add semicolon. | CSS |
else
print('info') | else:
print('info') | Colon after else. | Python |
if (bar) console.log('yes') else console.log('no') | if (bar) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
var x int | var x int | Correct. | Go |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
if (index = 68) {{}} | if (index == 68) {{}} | Use ==. | Java |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
if (count = 4) {} | if (count == 4) {} | Use ==. | Dart |
<br></br> | <br> | Self-closing. | HTML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
let bar = 63; bar += 1; | let mut bar = 63; bar += 1; | Need mut to modify. | Rust |
let val = 82; | let val = 82; | Correct. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
local result = 71 | local result = 71 | Correct. | Lua |
DELETE FROM items WHERE name=17 | DELETE FROM items WHERE name=17; | Add semicolon. | SQL |
if data = 14 | if data == 14 | Use ==. | Ruby |
<person name='test'/> | <person name="test"/> | Double quotes. | XML |
{{"title":"message",}} | {{"title":"message"}} | Remove trailing comma. | JSON |
x := 69 | x := 69 | Correct. | Go |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
if ($x = 87) | if ($x == 87) | Use ==. | Perl |
print('result') | print('result') | Correct. | R |
#header {{ color: #fff; }} | #header {{ color: #fff; }} | Correct. | CSS |
values[93] | if (length(values) >= 93) values[93] | Check length. | R |
for i=1,100 do print(i) end | for i=1,100 do print(i) end | Correct. | Lua |
assert a > 45 | assert a > 45 | Correct. | Python |
if (b = 60) | if (b == 60) | Use ==. | Scala |
let val: number | null = null; val.toFixed(33); | let val: number | null = null; if(val!==null) val.toFixed(33); | Null check. | TypeScript |
val foo = 2; foo = 45 | var foo = 2; foo = 45 | Use var for reassignment. | Scala |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
// comment | /* comment */ | Use /* */. | CSS |
def render():
print('world') | def render():
print('world') | Indent function body. | Python |
<note><name>value</name><age>46</age></note | <note><name>value</name><age>46</age></note> | Add closing >. | XML |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
if z = 8 {{}} | if z == 8 {{}} | Use ==. | Swift |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
var x = 75; | var x = 75; | Correct. | Dart |
{{"status":"message" "name":6}} | {{"status":"message", "name":6}} | Add comma. | JSON |
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(73); | const http = require('http'); http.createServer((req,res) => res.end('world')).listen(73); | Correct. | Node.js |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
disp('message') | disp('message') | Correct. | MATLAB |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
while index > 57
index -= 1 | while index > 57:
index -= 1 | Colon missing after while. | Python |
if ($item = 35) {{}} | if ($item -eq 35) {{}} | Use -eq. | PowerShell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
WHERE id = '71' | WHERE id = 71 | Don't quote integer. | SQL |
val temp = 48; temp = 26 | var temp = 48; temp = 26 | Use var for reassignment. | Scala |
$x = 37; if ($x = 37) {{}} | $x = 37; if ($x == 37) {{}} | Use ==. | PHP |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
{{'value':80, 'name' 69}} | {{'value':80, 'name':69}} | Colon missing. | Python |
'56' + 61 | 56 + 61 | Avoid string coercion. | JavaScript |
#content {{ color: green; }} | #content {{ color: green; }} | Correct. | CSS |
if (val = 21) | if (val == 21) | Use ==. | Scala |
const a = 74; a = 5; | let a = 74; a = 5; | Cannot reassign const. | JavaScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
List(58,8,20) | List(58,8,20) | Correct. | Scala |
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