I had the idea to develop a function that can count all the unique items in an array, but for some reason, I am not seeing any results.
Here is the array I am working with:
let arr = ["hi", "hello", "hi"];
This is the code snippet I have come up with so far:
function countUnique(arr) {
var counts = {};
for (var i = 0; i < arr.length; i++) {
counts[arr[i]] = 1 + (counts[arr[i]] || 0);
}
countUnique(arr);
}
console.log(countUnique(arr));
While you are correctly counting values, the issue arises when you call the method recursively countUnique(arr);, leading to a "call stack exceeded" error. To resolve this, simply eliminate the recursive call and return the counted value counts:
function countUnique(arr) {
var counts = {};
for (var i = 0; i < arr.length; i++) {
counts[arr[i]] = 1 + (counts[arr[i]] || 0);
}
return counts;
}
let arr = ["hi", "hello", "hi"];
console.log(countUnique(arr));The JavaScript engine has a limit on recursion depth. It's usually around 10000, with some engines allowing more.
If you want to find the number of unique elements in an array, you can create a Set and then return its size.
const countUniqueElements = arr => new Set(arr).size;
console.log(countUniqueElements(["apple", "banana", "apple"]));let array = ["hey", "hi", "hey there"];
function findUniqueValues(arr) {
var uniqueCounts = {};
for (var j = 0; j < arr.length; j++) {
if(arr[j] in uniqueCounts) {
uniqueCounts[arr[j]]++;
} else {
uniqueCounts[arr[j]] = 1;
}
}
return Object.keys(uniqueCounts).length;
}
console.log(findUniqueValues(array));
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