Memoized Read-Only

Define a memoized read-only object property.

Usage

var setMemoizedReadOnly = require( '@stdlib/utils/define-memoized-read-only-property' );

setMemoizedReadOnly( obj, prop, fcn )

Defines a memoized read-only object property.

var obj = {};

function foo() {
    return 'bar';
}

setMemoizedReadOnly( obj, 'foo', foo );

var v = obj.foo;
// returns 'bar'

The last argument should be a synchronous function whose return value will be memoized and set as the property value.

Notes

  • A read-only property is enumerable and non-configurable; however, until deferred evaluation, an object property is configurable.

Examples

var fibonacci = require( '@stdlib/math/base/special/fibonacci' );
var setMemoizedReadOnly = require( '@stdlib/utils/define-memoized-read-only-property' );

function Foo() {
    var self;
    if ( !(this instanceof Foo) ) {
        return new Foo();
    }
    self = this;
    this.count = 0;
    setMemoizedReadOnly( this, 'fibo', fibo );
    return this;

    function fibo() {
        self.count += 1;
        return fibonacci( 73 );
    }
}

var foo = new Foo();

var i;
for ( i = 0; i < 10; i++ ) {
    console.log( 'F: %d. Count: %d.', foo.fibo, foo.count );
}