join toString
These two methods convert the type of the array element to a string
var arr = [1, [2, [3, [4, 5]]], 6];
(()); //1,2,3,4,5,6
(()); //1,2,3,4,5,6
var flatArr = ().split(','); // ["1", "2", "3", "4", "5", "6"]
var flatArr = ().split(',');// ["1", "2", "3", "4", "5", "6"]
Disadvantages: After converting to a one-dimensional array, the array element needs to be converted to a string.
es6 flat
() is used to "flatten" the nested array and turn it into a one-dimensional array. This method returns a new array, which has no effect on the original data
flat() will only "flat" one layer by default. If you want to "flat" a nested array of multiple layers, you can write the parameters of the flat() method as an integer to represent the number of layers you want to flatten, and the default is 1.
If you have to convert it into a one-dimensional array no matter how many layers of nesting are there, you can use the Infinity keyword as a parameter.
(Infinity); // [1, 2, 3, 4, 5, 6]
Disadvantages: Compatibility of flat method needs to be considered
Recursive traversal
function flatten(arr) {
return ((acc, cur)=> { // Recursive when encountering nesting return ((cur) ?
flatten(cur) : cur);
}, []);
}
(flatten(arr)); // [1, 2, 3, 4, 5, 6]
Recursive traversal
function flatten(arr) {
while ((item => (item))) {
arr = [].concat(...arr);
}
return arr;
}
(flatten(arr)); // [1, 2, 3, 4, 5, 6]
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