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参考透明度这个术语是什么意思？我听说它被描述为"它意味着你可以用平等替换等于",但这似乎是一个不充分的解释.

In all the examples I can find on memoization / internal function cache in Functional Programming in JavaScript, the examples are either mutating or reassigning the cache.

Here's an example taken from https://scotch.io/tutorials/understanding-memoization-in-javascript#toc-a-functional-approach

function memoizer(fun){
    let cache = {}
    return function (n){
        if (cache[n] != undefined ) {
          return cache[n]
        } else {
          let result = fun(n)
          cache[n] = result
          return result
        }
    }
}

The only tiny improvement I can come up with is to use reassigning instead of …