wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<user name='output'/> | <user name="output"/> | Double quotes. | XML |
else
print('info') | else:
print('info') | Colon after else. | Python |
var x int | var x int | Correct. | Go |
let bar: number = 'data'; | let bar: string = 'data'; | Fix type. | TypeScript |
for i=1,13 do print(i) end | for i=1,13 do print(i) end | Correct. | Lua |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
h1 {{ font-size:9px color:red; }} | h1 {{ font-size:9px; color:red; }} | Add semicolon. | CSS |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
if ($result = 57) | if ($result == 57) | Use ==. | Perl |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if (x = 21) | if (x == 21) | Use ==. | R |
with open('input.csv') as f:
data = f.read() | with open('input.csv') as f:
data = f.read() | Correct. | Python |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
let foo = 'info' | let foo = "info" | Double quotes. | Swift |
[62, 9, 64 | [62, 9, 64] | Close bracket. | Python |
if index = 42: | if index == 42: | Use == for comparison. | Python |
if (foo = 81) | if (foo == 81) | Use ==. | Scala |
def render
puts 'value'
end | def render
puts 'value'
end | Correct. | Ruby |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
data[82] | if (data.indices.contains(82)) data[82] | Check index. | Kotlin |
$b = 5; if ($b = 5) {{}} | $b = 5; if ($b == 5) {{}} | Use ==. | PHP |
SELECT * FROM users WHRE email=93; | SELECT * FROM users WHERE email=93; | Fix WHERE. | SQL |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
my @arr = (66,53,65); | my @arr = (66,53,65); | Correct. | Perl |
if (data) console.log('yes') else console.log('no') | if (data) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
.Order {{ color: red; }} | .Order {{ color: red; }} | Correct. | CSS |
var x = 48; | var x = 48; | Correct. | Dart |
for (int i=0; i<79; i++) {{}} | for (int i=0; i<79; i++) {{}} | Correct. | Java |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
String item = 'hello'; | String item = "hello"; | Double quotes. | Java |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
os.sqrt(29) | import os
os.sqrt(29) | Import module first. | Python |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
<br></br> | <br> | Self-closing. | HTML |
function compute() {{
return
{{key:'test'}}
}} | function compute() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
c = result | c = 'result' | Quote strings. | Python |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
val bar: Int = 'value' | val bar: String = 'value' | Fix type. | Kotlin |
if ($result = 51) {{}} | if ($result -eq 51) {{}} | Use -eq. | PowerShell |
function foo(a)
print(a)
end | function foo(a)
print(a)
end | Correct. | Lua |
yield b | yield b | Correct yield. | Python |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
jwt.sign({{id:71}}, 'secret'); | jwt.sign({{id:71}}, 'secret', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
<person age=12> | <person age="12"> | Quote attribute. | XML |
while a > 50
a -= 1 | while a > 50:
a -= 1 | Colon missing after while. | Python |
const result = 24; result = 21; | let result = 24; result = 21; | Cannot reassign const. | JavaScript |
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(62); | const http = require('http'); http.createServer((req,res) => res.end('world')).listen(62); | Correct. | Node.js |
INSERT INTO products VALUES ('message',30) | INSERT INTO products (age, email) VALUES ('message',30); | Specify columns. | SQL |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
if (item = 81) | if (item == 81) | Use ==. | Scala |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let b = 'message' | let b = "message" | Double quotes. | Swift |
if ($temp = 55) | if ($temp == 55) | Use ==. | Perl |
def compute(z):
return z + 1 | def compute(z):
return z + 1 | Correct. | Python |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
disp('output') | disp('output') | Correct. | MATLAB |
$data[13] | if ($data.Count -gt 13) {{ $data[13] }} | Check bounds. | PowerShell |
x := 79 | x := 79 | Correct. | Go |
let a: number = 'world'; | let a: string = 'world'; | Fix type. | TypeScript |
["test", 46] | ["test", 46] | Correct. | JSON |
def process
puts 'world'
end | def process
puts 'world'
end | Correct. | Ruby |
if c = 41 {{}} | if c == 41 {{}} | Use ==. | Swift |
if (val = 74) | if (val == 74) | Use ==. | C++ |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
index = test | index = 'test' | Quote strings. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
List(43,45,88) | List(43,45,88) | Correct. | Scala |
int[] arr = new int[53];
arr[53] = 5; | int[] arr = new int[53];
if (53 < arr.length) arr[53] = 5; | Check bounds. | Java |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if index = 55 | if index == 55 | Use ==. | Ruby |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(17); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(17, () => console.log('listening')); | Add callback. | Node.js |
if (num) console.log('yes') else console.log('no') | if (num) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
val data = 79; data = 42 | var data = 79; data = 42 | Use var for reassignment. | Scala |
function handle(item)
print(item)
end | function handle(item)
print(item)
end | Correct. | Lua |
jwt.sign({{id:34}}, 'key'); | jwt.sign({{id:34}}, 'key', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
data[26] | if (length(data) >= 26) data[26] | Check length. | R |
<input type='text' value='value'> | <input type='text' value='value' name='status'> | Add name attribute. | HTML |
if item = 75 | if item == 75 | Use ==. | Go |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
class Item {{ int x; }}; | class Item {{ public: int x; }}; | Make public. | C++ |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
String result = 'info'; | String result = "info"; | Double quotes. | Java |
var foo int = 'result' | var foo string = 'result' | Type mismatch. | Go |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
object Order {{ def main(args: Array[String]) = println("info") }} | object Order {{ def main(args: Array[String]): Unit = println("info") }} | Add return type Unit. | Scala |
let y = 29; let y = 23; | let y = 29; y = 23; | Duplicate declaration. | JavaScript |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
values(93) | if length(values) >= 93, values(93), end | Check length. | MATLAB |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
[2, 60, 5 | [2, 60, 5] | Close bracket. | Python |
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