counting how many times an item appears in a multidimensional array in javascript

Question

Given a multidimensional array like this:

 var arr = [
\"apple\",
[\"banana\", \"strawberry\",\"dsffsd\", \"apple\"],
\"banana\",
[\"sdfdsf\",\"apple\",[\"apple\         


        

Answer 1

You could iterate the flat version of arr using arr.toString().split(",") so you don't need recursion.

var arr =  [
    "apple",
    ["banana", "strawberry","dsffsd", "apple"],
    "banana",
    ["sdfdsf","apple",["apple",["nonapple", "apple",["apple"]]]]
    ,"apple"];


var counts = {};


 arr.toString().split(",").forEach(e=>{
    counts[e] = (counts[e] || 0) +1
 })   

 console.log(counts.apple)

Doesn't work if elements have "," inside, but works with.flat() instead of .toString().split(",")