Expected Input:
var arr = [null, 7, 9, undefined, 5, , 0, 8, 2, 1]
console.log(arr.length);
Expected Output:
Length: 7
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3 Answers
You can do this way using filter(), it will filter out null and undefined but will keep 0.
var array = [null, 7, 9, undefined, 5, , 0, 8, 2, 1];
console.log(array.filter(n=> n == 0 || n ).length)
answered May 13, 2020 at 14:10
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Comments
You can simply use .filter() method and Number.isFinite to get only numbers from array and ignore all falsy values except 0 like this:
var arr = [null, 7, 9, undefined, 5, , 0, 8, 2, 1]
arr = arr.filter(Number.isFinite);
console.log(arr);
Comments
You could iterate the items and check the value for counting.
var array = [null, 7, 9, undefined, 5, , 0, 8, 2, 1],
length = 0;
for (let value of array) if (value !== null && value !== undefined) length++;
console.log(length);