indexOf and lastIndexOf methods | String Object In JavaScript

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Sounds to me like empty string is philosophically like the human soul.  
From StackOverflow…
The empty string is everywhere, and nowhere. It is within all strings at all times, permeating the essence of their being, yet as you seek it you shall never catch a glimpse.  

Indeed, the empty string can be found between any two adjacent characters in a string as well as at the start and end. The first such instance is the very start of the string, namely position 0. All characters are separated by an empty String.

A string contains the empty string in order to be in accordance with Set Theory, according to which:
The empty set is a subset of every set including itself.
This also means that even the empty string contains the empty string.

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