Self-Modifying Javascript Objects
Self-Modifying Javascript Objects
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I thought it’d be interesting to consider Javascript objects which can modify their own behavior over time. A use case for this (what I’m doing) is pages of data, where data is first looked up, then cached in memory, then cleared. A simple case (demonstrated below) is memoization.
The following query will do an ajax lookup of some data:
function loadData() { var data; $.ajax({ url: "blocks/" + this.block, async: false }).done(function(blockData) { data = blockData.split("\n") for (var i = 0; i < data.length; i++) { data[i] = data[i].split("\t") } }); return data; } var x = {block: 'xabnh', getData: loadData} x.getData(); Array[2501]
This shows how one might trigger caching the results. Once retrieved, the cached data is hidden within a closure, and the mechanism for retrieving data is updated. In the case of a memory manager, these pages are later cleared out by replacing the memoization function with a third function, which starts the process all over again.
var x = {block: 'xabnh', getData: memoize(loadData)} function memoize(getData) { return function() { console.log('loading'); var data = getData.apply(this); function savedData() { console.log('memoized'); return data; } this.getData = savedData; return data; } } x.getData() loading Array[2501] x.getData() memoized Array[2501]
There are a few downsides to this approach; data in the closure is hidden from inspection, the current state of the object is hidden, and can change quickly. A generalized approach to this problem might pass an object into the getData function to show state or trigger a debug mode.
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