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Don’t you mean if (!set1.hasOwnProperty(key))?
– Gumbo
Commented Oct 18, 2009 at 8:56
2

Why would I mean that? The purpose of that condition is to ignore properties that may be in the object's prototype.
– Nick Retallack
Commented Oct 18, 2009 at 19:13
It is not efficient to convert to objects in every use case. For example, we might want the union of keys from 2 arrays of Object.keys().
– OXiGEN
Commented Feb 9, 2021 at 23:20

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create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)
<https://example.com>
[example](https://example.com)
<a href="https://example.com">example</a>

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