Check empty numbers in array

Question

For learning purpose, I would like to know how to check the empty numbers (or replaced with letters) from random numbers.

I put numbers and letters into an array:

var numb = [1, 7, 3, a, 4];

In this case we don't know the highest number or the lowest number.

I want to check the empty numbers starting from number 2 to the highest (result 2, 5, and 6).

why don't you replace 'your empty number' (OR MAY BE UNDEFINED VALUE) from the array? then you can get the highest value — Oki E. Rinaldi
– Oki E. Rinaldi, Commented Oct 4, 2014 at 1:35
In this case I want to get number 2, 5, and 6 from the above array. — Agus Putra Dana
– Agus Putra Dana, Commented Oct 4, 2014 at 1:35
loop the array, check if the element/item is a 'number' or not, if not replace it! — Oki E. Rinaldi
– Oki E. Rinaldi, Commented Oct 4, 2014 at 1:36
A small suggestion: Next time try to show what you've tried (some code) to accomplish your task! Don't expect people to write code for you! ;) Happy coding! — Roko C. Buljan
– Roko C. Buljan, Commented Oct 4, 2014 at 1:52

Paul S. · Accepted Answer · 2014-10-04 01:48:07Z

3

Loop over your Array to find the maximum max, then iterate max - 1 - minumum times testing for the existence of numbers in the Array.

function foo(arr) {
    var bar = [],
        i,
        max = -Infinity;
    for (i = 0; i < arr.length; ++i) // loop 1
        if (arr[i] === +arr[i]) // simple check if number, throw away NaN
            if (arr[i] > max)
                max = arr[i];
    while (max-- > 2) // loop 2, you said 2 is minimum
        if (arr.indexOf(max) === -1)
           bar.unshift(max);
    return bar;
}

foo([1, 7, 3, 'baz', 4]); // [2, 5, 6]

I also assumed all your numbers will be integers.

answered Oct 4, 2014 at 1:48

Paul S.

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2 Comments

Roko C. Buljan Over a year ago

max = -Infinity; why - ? Why Infinity at all

Paul S. Over a year ago

@RokoC.Buljan any number (except NaN and itself) is greater than -Infinity. Also, Math.max(); // -Infinity. Any loop where -Infinity is the highest iteration count will immediately stop.

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