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Exercise 10

How many primitive values are there in the following expression? Identify them. How many objects are there in the expression? Identify those objects.

[1, 2, ["a", ["b", false]], null, {}]

Solution

There are 6 primitive values and 4 objects:

Primitive Values	Objects
`1`	`[1, 2, ["a", ["b", false]], null, {}]`
`2`	`["a", ["b", false]]`
`"a"`	`["b", false]`
`"b"`	`{}`
false
null

The outermost set of brackets defines an array (an object) that contains 5 elements. The elements with values 1, 2, and null are all primitive values, while ["a", ["b", false]] is a nested array, and {} is nested object. The nested array has 2 elements, one of which is a primitive value ("a"), while the other is yet another nested array. Finally, this innermost array contains two elements, "b" and false, both of which are primitive values.

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