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Object literal: getter

A getter binds an object property to a function that will be called when that property is looked up.

An object literal can also contain getters

just prefix the property with get (and make it a function)
const obj = { x() { return 'ax'; } }; assert.equal(obj.x, 'ax');
must have NO parameters
const obj = { x(param) { return 'ax'; } }; assert.equal(obj.x, 'ax');
can be a computed property (an expression enclosed in `[]')
const keyName = 'x'; const obj = { get keyName() { return 'ax'; } }; assert.equal(obj.x, 'ax');
can be removed using delete
const obj = { get x() { return 'ax'; } }; delete obj.y; assert.equal(obj.x, void 0);


Description of all the details of a getter.
"An accessor property associates a key value with one or two accessor functions ..."
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