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Object.is() ↔ Object Static Method to check if equality of two values, with even greater strictness than ===

Source: Object.is() - JavaScript | MDN

Object.is() when both (eval to) undefined?

Object.is() when both (eval to) null

both true

both false

both same string

both same number

References​

  1. assert.strictEqual() ↔ assert Static Method to test expression === expected, determined by Object.is()

  2. [**_Object.is()_**](object-is) same number for ↔ both +0 OR both -1 or both NaN or both non-zero with same value