wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
const p:Person = {{name:'value'}}; | const p:Person = {{name:'value', age:50}}; | Add missing property. | TypeScript |
z = 4 | z=4 | No spaces. | Shell |
List(45,20,32) | List(45,20,32) | Correct. | Scala |
items[95] | if items.indices.contains(95) {{ items[95] }} | Check index. | Swift |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
var x int | var x int | Correct. | Go |
def baz
puts 'data'
end | def baz
puts 'data'
end | Correct. | Ruby |
if y > 47
puts 'message' | if y > 47
puts 'message'
end | Add 'end'. | Ruby |
if (b = 88) {{}} | if (b == 88) {{}} | Use ==. | Kotlin |
{{'title':'info'}} | {{"title":"info"}} | Use double quotes. | JSON |
if ($a = 81) | if ($a == 81) | Use ==. | Perl |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
val = output | val = 'output' | Quote strings. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
let vec=vec![29,69,22]; let head=&vec[0]; vec.push(3); | let mut vec=vec![29,69,22]; let head=vec[0]; vec.push(3); | Copy instead of reference. | Rust |
if c = 9 | if c == 9 | Use ==. | Go |
val index = 'message' | val index = "message" | Double quotes. | Kotlin |
match y {{ 1 => {{}} }} | match y {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
<person name='output'/> | <person name="output"/> | Double quotes. | XML |
print('output') | print('output') | Correct. | R |
'result' + 47 | 'result' + 47.to_s | Convert int. | Ruby |
val foo: Int = 'test' | val foo: String = 'test' | Fix type. | Kotlin |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
print 'message' | print('message') | print needs parentheses. | Python |
name: test
age: 19 | name: test
age: 19 | Correct. | YAML |
if (a = 41) | if (a == 41) | Use ==. | Scala |
function compute() {{
return
{{key:'output'}}
}} | function compute() {{
return {{key:'output'}};
}} | Return object on same line. | JavaScript |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
["test", 14] | ["test", 14] | Correct. | JSON |
arr[82] | if (arr.indices.contains(82)) arr[82] | Check index. | Kotlin |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
const num; | const num = 91; | Initialize const. | JavaScript |
def render():
print('output') | def render():
print('output') | Indent function body. | Python |
local index = 6 | local index = 6 | Correct. | Lua |
<br></br> | <br> | Self-closing. | HTML |
<person age=35> | <person age="35"> | Quote attribute. | XML |
for b in range(40)
print(b) | for b in range(40):
print(b) | Colon after for. | Python |
test | test() | Add parentheses. | Swift |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
function render(data)
print(data)
end | function render(data)
print(data)
end | Correct. | Lua |
<table><tr><td>hello<td>data</tr></table> | <table><tr><td>hello</td><td>data</td></tr></table> | Close td. | HTML |
if (count = 76) | if (count == 76) | Use ==. | C++ |
function process(): void {{ return 3; }} | function process(): number {{ return 3; }} | Return type mismatch. | TypeScript |
if foo = 15 {{}} | if foo == 15 {{}} | Use ==. | Swift |
{{"id":"info" "age":4}} | {{"id":"info", "age":4}} | Add comma. | JSON |
<note><age>info</age><age>58</age></note | <note><age>info</age><age>58</age></note> | Add closing >. | XML |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
def test(index):
return index + 1 | def test(index):
return index + 1 | Correct. | Python |
let mut item=18; let r1=&mut item; let r2=&mut item; | let mut item=18; {{ let r1=&mut item; }} let r2=&mut item; | Only one mutable borrow. | Rust |
with open('input.csv') as fp:
data = fp.read() | with open('input.csv') as fp:
data = fp.read() | Correct. | Python |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
class Product {{ int index; }}
obj.index=5; | class Product {{ public int index; }}
obj.index=5; | Make field public. | Java |
else
print('result') | else:
print('result') | Colon after else. | Python |
WHERE age = '29' | WHERE age = 29 | Don't quote integer. | SQL |
SELECT name status FROM users; | SELECT name, status FROM users; | Add comma. | SQL |
64data = 10 | data64 = 10 | Variable cannot start with digit. | Python |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
$b = 31; if ($b = 31) {{}} | $b = 31; if ($b == 31) {{}} | Use ==. | PHP |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if val = 91 then
print('world')
end | if val == 91 then
print('world')
end | Use ==. | Lua |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
let count = 'output' | let count = "output" | Double quotes. | Swift |
if (index = 96) {{}} | if (index == 96) {{}} | Use ==. | Java |
<hr></hr> | <hr> | Self-closing. | HTML |
if result = 64 | if result == 64 | Use ==. | Ruby |
// comment | /* comment */ | Use /* */. | CSS |
function baz() {{ echo 'test'; }} | function baz() {{ echo 'test'; }} | Correct. | PHP |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
cin >> val; | int val;
cin >> val; | Declare variable. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
for i=1,35 do print(i) end | for i=1,35 do print(i) end | Correct. | Lua |
data == '83' | data === 83 | Use strict equality. | JavaScript |
switch(b){{ case 59: break; }} | switch(b){{ case 59: break; default: break; }} | Add default case. | Java |
render | render() | Add parentheses. | Kotlin |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
while bar > 23
bar -= 1 | while bar > 23:
bar -= 1 | Colon missing after while. | Python |
disp('value') | disp('value') | Correct. | MATLAB |
object Product {{ def main(args: Array[String]) = println("world") }} | object Product {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
if (z = 95) | if (z == 95) | Use ==. | R |
x := 82 | x := 82 | Correct. | Go |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
assert a > 74 | assert a > 74 | Correct. | Python |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
echo info test | echo 'info test' | Quote to prevent splitting. | Shell |
SELECT * FROM items WHRE age=65; | SELECT * FROM items WHERE age=65; | Fix WHERE. | SQL |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
let val: number | null = null; val.toFixed(47); | let val: number | null = null; if(val!==null) val.toFixed(47); | Null check. | TypeScript |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
var index int = 'data' | var index string = 'data' | Type mismatch. | Go |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
title: message
id: test, | title: message
id: test | Remove comma. | YAML |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
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