Multidimensional array dimensionality reduction is that array flattening
There are many ways to flatten arrays, but I mainly use five, as follows:
One, recursion
// One, recursion let arr = [1, [2, 3, 4, 5], [6, 7, 8, 9, [10, 11, 12, [14, 15, 16]]]]
let newArr = []
const getArr=(array)=>{
((item)=>{
// If the traversed element is not an array, put this element into the new array // Otherwise, recursively call the method again (item) ? getArr(item) : (item)
})
}
getArr(arr)
(newArr)
2. Convert a multi-dimensional array into a string and then convert it into a one-dimensional array
let arr = [1, [2, 3, 4, 5], [6, 7, 8, 9, [10, 11, 12, [14, 15, 16]]]]
((',').split(','))
3. Methods of using arrays
(Use Infinity as depth to expand nested arrays of any depth)
() let arr = [1, [2, 3, 4, 5], [6, 7, 8, 9, [10, 11, 12, [14, 15, 16]]]] ((Infinity))
4. Use contact
var a = [1,[2],[3,4]]
var result = []
for(var i=0; i<; i++){
if(a[i].constructor == Array) {
result = (a[i])
}else {
(a[i])
}
}
(result)
5. Use extension operators
The extension operator is equivalent to splitting the array into the smallest unit.
...[1,2,[3, 4]] is equivalent to becoming 1,2, [3, 4]///[ ].concat(...a) is equivalent to [ ].concat(1,2,[3, 4])
var a = [1,[2],[3,4]]
var result = []
result = [].concat(...a)
(result)
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