There appears to be a missing value in the array for IndexOf function

Why is my IndexOf function returning -1 when I know the value is in the array?

This issue has been confirmed with console.log using the following code (paraphrased for simplicity):

var xtiles = [];

function assignValue(tile) {
    xtiles.push(tile); //tile is 1 at this point
    checkArray();
}

function checkArray() {
    var temp = xtiles.indexOf(1);
    console.log(temp); //this returns a -1
    console.log(xtiles[0]); //this returns a 1
}

Based on the data, 'temp' should be equal to 0 since there is a 1 in index 0 of the array xtiles. What could be causing this mismatch?

Answer №1

The reason for this is that the value 1 does not exactly match the string '1'.

The method indexOf() compares searchElement to elements within the Array using strict equality (the same approach taken by the ===, or triple-equals, operator).

For more information:

Answer №2

When dealing with an array containing strings, one possible way to search is by using the following method:

var result = myArray.indexOf("desiredString");

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