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kotlinlang

Guys, is 
```
collections
.filter { it.conditionA }
.filter { it.conditionB }
.filter { it.conditionC }
```

performing same as 
```
collections
.filter { it.conditionA || it.conditionB || it.conditionC }
```?

I wonder if 1st block will be 3x times slower or not?

shouldn’t it be `it.conditionA &amp;&amp; it.conditionB &amp;&amp; it.conditionC`? :slightly_smiling_face:

first one will generate 3 loops, second one - 1 loop.

also, since you're using collections instead of sequences you'll also have 3 collections created on each filter in the first, and only one in the second.

<@U3H5152AW> depends on what type `collections` is. If its a `List&lt;T&gt;`you end up with 3 loops, if its a `Sequence&lt;T&gt;` you get a single loop

All that being said I find the first version more readable and I always write code readable first, maintainable second, performant third. It's very possible that `collections` will always have so few elements that the performance impact is negligible. Or maybe the bottleneck is elsewhere.