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Suppose I have the following object in JavaScript:
var object = { "key1": "value1", "key2": "value2", "key3": "value3" }; How do I find out how many values exist in the object?
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Using the indexOf() method In this method, what we do is that we compare the index of all the items of an array with the index of the first time that number occurs. If they don't match, that implies that the element is a duplicate. All such elements are returned in a separate array using the filter() method.
To count the duplicates in an array:Copied! const arr = ['one', 'two', 'one', 'one', 'two', 'three']; const count = {}; arr. forEach(element => { count[element] = (count[element] || 0) + 1; }); // 👇️ {one: 3, two: 2, three: 1} console.
You can do that by using this simple code:
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