我试图确切地了解这个功能是如何运作的,但无法在我的大脑中弄清楚。请您能显示代码的分步过程吗?我一直坐在这里,试图在我的电脑上使用计算器在我的脑海中弄清楚这个例子,并在我的脑海中多次运行代码,但它只是没有加起来。双关语不是故意的。constructor(values) { this.values = values || []}const list = new List([1,2,3,4])expect(list.foldl((acc, el) => el / acc, 24)).toEqual(64);foldl(fn, initialValue) { let acc = initialValue; for (let i in this.values) { acc = fn(acc, this.values[i]); } return acc; // 64... HOW??!}好的,这就是我如何在脑海中运行它。请你向我解释为什么我错了,并告诉我伪代码中什么是正确的,就像我在下面所做的那样。```// accumulator is 24 and therefore we divide the first element of the array which is 1 by 24 which equals .041666667// the accumulator now ACCUMULATES which means 24 plus .041666667 is equal to 24.041666667// now the accumulator is 24.041666667 and we divide the second element of the array which is 2 by 24 which equals .083333333// the accumulator which is 24.041666667 now adds .083333333 which equals 24.874999997// now the accumulator is 24.874999997 and we divide the third element of the array which is 3 by 24.874999997 which equals .120603015 等等...我在这里缺少什么?
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陪伴而非守候
TA贡献1757条经验 获得超8个赞
积累并不意味着增加。这意味着运行您传入的函数foldl。此外,24 的值仅在第一次使用;之后,累加意味着它使用上次的返回值。这是正确的值序列:
acc = 24
el = 1
acc = 1/24
el = 2
acc = 2/(1/24) = 48
el = 3
acc = 3/48 = 1/16
el = 4
acc = 4/(1/16) = 64
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