Value returned by the assignment

Question

Why does the regular assignment statement (say, x = 5) return the value assigned (5 in this case), while the assignment combined with a variable d

Answer 1

When you write var x = 5; it declares x and initalizes its value to 5.

This is a VariableStatement, it returns nothing,

but x=5 is an expression that assigns 5 to x. as there is no x, JavaScript implicitly creates a global x in normal code