_.eq

[jdalton]

Related to and really depending on #2453:
An _.eq method to enable the SameValueZero comparison for composition.

[moredure]

Hello, @jdalton! Can you give an use case example for composition of this functions?

[jdalton]

Sure thing. See lodash/blob/npm/eq.js for an implementation reference.

This method extracts the SameValueZero comparison which would be what methods like
_.indexOf, _.includes, _.difference, _.intersection, _.lastIndexOf, _.uniq, & _.union
use for value comparisons.

It can be used as a shallow _.isEqual (without the recursive comparison bit).

[moredure]

@jdalton, may I follow ECMA to implement SameValueZero functionality and why you doesn't like private method 'eq'?

[jdalton]

may I follow ECMA to implement SameValueZero functionality

You can though it's just the long way around of basically === + NaN.
For reference here are the spec steps for ===.

why you doesn't like private method 'eq'

Private helpers and their names didn't factor into it.