The third if-clause is inaccessible

I am facing a challenge that I believe has a simple solution, but I'm unable to see it right now. I have three if-clauses that should be triggered based on the length of an array. Surprisingly, the first two clauses work perfectly fine, but I can't seem to activate the third one (arr.length === 3). Before the if clauses, I even tested the array's length with an alert and it displayed correctly.

function calculateDistances() {
        var arr = [];

        arr.push(posM, posL, posR);
        alert(arr[1])
        for (var i = 0; i < arr.length; i++) {
            if (!arr[i]) {
                arr.splice(i,1)
            }
        }
        alert(arr.length)
        if (arr.length === 0 || 1) {
            return true;
        }
        else if (arr.length === 2 ) {
            var diameter = calculateDiameter(arr[0], arr[1])
            if (diameter > minDistance) {
                return false;
            }
            else {
                return true;
            }
        }
        else if (arr.length === 3) {
            alert("hello")
            var diameter1 = calculateDiameter(arr[0], arr[1]);
            var diameter2 = calculateDiameter(arr[0], arr[2]);
            var diameter3 = calculateDiameter(arr[1], arr[3]);

            if (diameter1 && diameter2 && diameter3 < minDistance) {
                return true
            }
            else{
                return false
            }
        }

    }

Answer №1

You are unable to activate the second option.

There seems to be an issue here: if (arr.length === 0 || 1) {

The value of 1 is being interpreted as true.

Maybe what you intended was:

if (arr.length === 0 || arr.length === 1) {

Answer №2

This is what you require:

if (arr.length === 0 || arr.length === 1) {

The way it's written implies

if ((arr.length === 0) || true) {

and this will always evaluate to true.

Answer №3

It appears that the desired condition you seek is within the initial if statement.

if (arr.length === 0 || arr.length === 1) {
            return true;
  }

This logic verifies if the array's length is either 1 or 0. The current first if statement will always result in true because it evaluates to 1, which is considered a truthy value.

Answer №4

(arr.length === 0 || arr.length === 1)

Always consider this to be true.

An alternative would be:

if (arr.length <= 1) {
    return true;
}

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