What causes the variance in outcomes between employing a literal string versus a local variable?

Here is a loop that I am working with:

for (var key in criteria) {

    var exists = Object.keys(item).some(function(k) {
        return item[k] === "Test";
    })
}

Initially, this loop functions as expected and returns 15 trues based on the number of items. However, when I modify it to the following:

for (var key in criteria) {

    var myString = item[key];

    var exists = Object.keys(item).some(function(k) {
        return item[k] === myString;
    });
}

Even though I am certain that item[key] will eventually be equal to "Test" during the loop, the result is not consistent. Instead, it outputs all trues.

The structure of Criteria object is:

{
  habitat_type: "Mangroves", 
  issue_specific_terms: "Test"
}

Similarly, Item object looks like this:

{
  habitat_type: "Streams and rivers", 
  cci: "Low productivity/loss of agriculture", 
  intervention_type: "Restoration", 
  issue_specific_terms: "Test", 
  country: "United States of America"
}

Answer №1

In order to make the comparison accurate, you should update the value of myString. Currently, it remains constant which results in equal comparisons regardless of the criteria being considered. Modify myString to criteria[key]:

for (var key in criteria) {

    var myString = criteria[key];

    var exists = Object.keys(item).some(k => item[k] === myString);

}

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