Object literal: getter

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);

Links

mdn docs Description of all the details of a getter.
spec "An accessor property associates a key value with one or two accessor functions ..."
announcement Announcement of this kata on twitter.