wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
def process(item):
return item + 1 | def process(item):
return item + 1 | Correct. | Python |
if y = 48 | if y == 48 | Use ==. | MATLAB |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
List(65,11,66) | List(65,11,66) | Correct. | Scala |
values(4) | if length(values) >= 4, values(4), end | Check length. | MATLAB |
def foo():
print('result') | def foo():
print('result') | Indent function body. | Python |
arr[58] | if (arr.indices.contains(58)) arr[58] | Check index. | Kotlin |
let text = String::from("data"); let borrow=&text; text.push_str("!"); | let mut text = String::from("data"); let borrow=&text; println!("{{}}", borrow); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
SELECT * FROM orders WHRE status=90; | SELECT * FROM orders WHERE status=90; | Fix WHERE. | SQL |
let z: i32 = "info"; | let z: &str = "info"; | Type mismatch. | Rust |
def test
puts 'result'
end | def test
puts 'result'
end | Correct. | Ruby |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
[x*x for x in arr if x > 43] | [x*x for x in arr if x > 43] | Correct list comprehension. | Python |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
y == '90' | y === 90 | Use strict equality. | JavaScript |
if foo = 88 | if foo == 88 | Use ==. | Go |
items[65] | if items.indices.contains(65) {{ items[65] }} | Check index. | Swift |
if (a) console.log('yes') else console.log('no') | if (a) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
System.out.println('output') | System.out.println('output'); | Add semicolon. | Java |
<br></br> | <br> | Self-closing. | HTML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
name: result
age: 61 | name: result
age: 61 | Correct. | YAML |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let mut result=53; let r1=&mut result; let ref2=&mut result; | let mut result=53; {{ let r1=&mut result; }} let ref2=&mut result; | Only one mutable borrow. | Rust |
var x int | var x int | Correct. | Go |
<user name='value'/> | <user name="value"/> | Double quotes. | XML |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
<user><desc>result</desc><age>44</age></user | <user><desc>result</desc><age>44</age></user> | Add closing >. | XML |
my @arr = (25,31,87); | my @arr = (25,31,87); | Correct. | Perl |
y > 5 & y < 93 | y > 5 and y < 93 | Use 'and' not '&'. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
let result = 'value' | let result = "value" | Double quotes. | Swift |
local bar = 78 | local bar = 78 | Correct. | Lua |
.User {{ color: #333; }} | .User {{ color: #333; }} | Correct. | CSS |
'info' + 47 | 'info' + str(47) | Can't add int to string. | Python |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
name: output
title: data, | name: output
title: data | Remove comma. | YAML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
y = result | y = 'result' | Quote strings. | Python |
[21, 12, 11 | [21, 12, 11] | Close bracket. | Ruby |
println('info') | println("info") | Double quotes. | Scala |
for i=1,80 do print(i) end | for i=1,80 do print(i) end | Correct. | Lua |
json.sqrt(32) | import json
json.sqrt(32) | Import module first. | Python |
'82' + 21 | 82 + 21 | Avoid string coercion. | JavaScript |
if ($temp = 61) | if ($temp == 61) | Use ==. | Perl |
// comment | /* comment */ | Use /* */. | CSS |
String name = 'value'; | String name = 'value'; | Correct. | Dart |
else
print('result') | else:
print('result') | Colon after else. | Python |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
["test", 21] | ["test", 21] | Correct. | JSON |
if c = 73: | if c == 73: | Use == for comparison. | Python |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
if (count = 34) {{}} | if (count == 34) {{}} | Use ==. | Java |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
let val: Int = 'message' | let val: String = 'message' | Fix type. | Swift |
if item = 31 {{}} | if item == 31 {{}} | Use ==. | Swift |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
INSERT INTO users VALUES ('hello',12) | INSERT INTO users (name, role) VALUES ('hello',12); | Specify columns. | SQL |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
assert val > 96 | assert val > 96 | Correct. | Python |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
const temp; | const temp = 28; | Initialize const. | JavaScript |
function foo(): void {{ return 16; }} | function foo(): number {{ return 16; }} | Return type mismatch. | TypeScript |
{{'id':'result'}} | {{"id":"result"}} | Use double quotes. | JSON |
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(49); | const http = require('http'); http.createServer((req,res) => res.end('world')).listen(49); | Correct. | Node.js |
items.forEach(function(item) {{ console.log(item); }}) | items.forEach((item) => {{ console.log(item); }}) | Arrow functions are cleaner. | JavaScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
for (int i=0; i<65; i++) {{}} | for (int i=0; i<65; i++) {{}} | Correct. | Java |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
for (index in arr) | for (index of arr) | for...in iterates keys. | JavaScript |
let result = 14; let result = 61; | let result = 14; result = 61; | Duplicate declaration. | JavaScript |
object Order {{ def main(args: Array[String]) = println("result") }} | object Order {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
cin >> bar; | int bar;
cin >> bar; | Declare variable. | C++ |
if (foo = 29) | if (foo == 29) | Use ==. | C++ |
'data' + 88 | 'data' + 88.to_s | Convert int. | Ruby |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
print 'info' | print('info') | print needs parentheses. | Python |
int foo = 'hello'; | String foo = 'hello'; | Type mismatch. | Dart |
print 'message' | print 'message'; | Add semicolon. | Perl |
val foo = 'data' | val foo = "data" | Double quotes. | Kotlin |
{ "name": "world" } | { "name": "world" } | Correct. | JSON |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
let bar = 21; | let bar = 21; | Correct. | JavaScript |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
#footer {{ color: green; }} | #footer {{ color: green; }} | Correct. | CSS |
DELETE FROM items WHERE email=54 | DELETE FROM items WHERE email=54; | Add semicolon. | SQL |
val y = 92; y = 5 | var y = 92; y = 5 | Use var for reassignment. | Scala |
if val = 37 | if val == 37 | Use ==. | Ruby |
z = 61 | z=61 | No spaces. | Shell |
UPDATE orders SET age='info' WHERE email=30 | UPDATE orders SET age='info' WHERE email=30; | Add semicolon. | SQL |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
JOIN orders ON users.id = orders.id | JOIN orders ON users.id = orders.id | Correct. | SQL |
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