javascript lodash：如何在起始值和结束值之间循环
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lodash : how to loop with between a start value and end value
提问by Temp O'rary
I've a for loop in javascript shown below. How toconvert it to lodash for loop? In such scenarios using lodash is advantageous over javascript for loop?
我在 javascript 中有一个 for 循环，如下所示。如何将其转换为 lodash for 循环？在这种情况下，使用 lodash 是否优于 javascript for 循环？
I've not used lodash much. Hence please advice.
我没有经常使用 lodash。因此请指教。
for (var start = b, i = 0; start < end; ++i, ++start) {
// code goes here
}
采纳答案by IxDay
I will imagine that b = 3and end = 10if I run your code and print the variables here is what I will get:
我会想象，b = 3而end = 10如果我运行代码，并打印这里的变量是什么，我会得到：
var b = 3;
var end = 10;
for (var start = b, i = 0; start < end; ++i, ++start) {
console.log(start, i);
}
> 3 0
> 4 1
> 5 2
> 6 3
> 7 4
> 8 5
> 9 6
To perform this with lodash (or underscore) I will first generate an array with rangethen iterate over it and gets the index on each iteration.
要使用 lodash（或下划线）执行此操作，我将首先生成一个数组，range然后对其进行迭代并获取每次迭代的索引。
Here is the result
这是结果
var b = 3;
var end = 10;
// this will generate an array [ 3, 4, 5, 6, 7, 8, 9 ]
var array = _.range(b, end);
// now I iterate over it
_.each(array, function (value, key) {
console.log(value, key);
});
And you will get the same result. The complexity is the same as the previous one (so no performance issue).
你会得到同样的结果。复杂性与前一个相同（因此没有性能问题）。
回答by Andrew Luca
You can use lodash range
https://lodash.com/docs/4.17.4#range
您可以使用 lodash range
https://lodash.com/docs/4.17.4#range
_.range(5, 10).forEach((current, index, range) => {
console.log(current, index, range)
})
// 5, 0, [5, 6, 7, 8, 9, 10]
// 6, 1, [5, 6, 7, 8, 9, 10]
// 7, 2, [5, 6, 7, 8, 9, 10]
// 8, 3, [5, 6, 7, 8, 9, 10]
// 9, 4, [5, 6, 7, 8, 9, 10]
// 10, 5, [5, 6, 7, 8, 9, 10]
回答by Binkan Salaryman
It seems there is no lodash way for writing loose forloops (those not iterating over a collection), but here is a simplified version of it:
似乎没有 lodash 的方式来编写松散for循环（那些不迭代集合的循环），但这里是它的一个简化版本：
for (var i = 0; i < end - b; i++) {
var start = i + b;
// code goes here
}
