在JavaScript中获取数组的深度 [英] Get array's depth in JavaScript
问题描述
为了获得数组的深度,我想我可以像这样使用flat()
方法:
In order to get the array's depth I thought I can use the flat()
method like so:
function getArrayDepth(ry){
// number of levels: how deep is the array
let levels = 1;
// previous length
let prev_length = 1;
// current length
let curr_length = ry.length;
//if the resulting array is longer than the previous one add a new level
while(curr_length > prev_length){
ry = ry.flat();
prev_length = curr_length
curr_length = ry.length;
levels ++
}
return levels;
}
let testRy = [1,2,[3,4,[5,6],7,[8,[9,91]],10],11,12]
console.log(testRy);
console.log(getArrayDepth(testRy))
console.log(testRy);
如果其中一个数组的长度为1,则表明它可以正常工作
It seams it works BUT if one of the arrays inside has a length of 1
let testRy = [1、2,[3、4,[5、6],7,[8, [9] ],10],11、12]
let testRy = [1, 2, [3, 4, [5, 6], 7, [8, [9] ], 10], 11, 12]
该函数失败,因为展平的数组与上一个数组一样长.
the function fails since the flattened array is as long as the previous one.
有没有更好的方法来获取javascript中数组的深度?
Is there a better way to get the depth of an array in javascript?
推荐答案
我认为递归方法更简单.如果您当前的项目是数组,请确定其子项的最大深度并添加1..
I think a recursive approach is simpler. If your current item is an Array determine the max depth of its children and add 1.
function getArrayDepth(value) {
return Array.isArray(value) ?
1 + Math.max(...value.map(getArrayDepth)) :
0;
}
let testRy = [1,2,[3,4,[5,6],7,[8,[9,91]],10],11,12]
console.log(testRy);
console.log(getArrayDepth(testRy))
console.log(testRy);
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