Memoization decorator for javascript functions

memoize.js

/*
function memoize(f) {
	return function(...p){
		this._cache = this._cache || []
		var k = p.join('|')
		return this._cache[k] || (this._cache[k] = f(...p))
	}
}
*/

const memoize=(f)=>(...p)=>(this._=this._||[])[k=p.join('|')]||(this._[k]=f(...p))

/** EXAMPLE **/

function foo(index) {
	// Return a non-determonistic value (for testing purposes)
	return "" + index + ":" + (Math.random()*100000|0)
}

// Add memoization to foo function
foo = memoize(foo)

console.log(
	foo(1), // RANDOM VALUE (A)
	foo(1), // SAME as A
	foo(2), // RANDOM VALUE (B)
	foo(3), // RANDOM VALUE (C)
	foo(1), // SAME as A
	foo(1), // SAME as A
	foo(3)  // SAME as C
)