I am working with a JavaScript array that has a length of 129.
var fullnames = [Karri, Ismo, Grigori, Ahmed, Roope, Arto .....]
My goal is to determine how many times each name appears in the array and store that information in another array like this:
var counter = [2, 5, 7, ..]
For example, if Karri appeared in the fullnames array 2 times, Ismo appeared 5 times, and so on. Does anyone have any suggestions on how to achieve this?
This method is both efficient and straightforward:
var fullnames = ["Karri", "Ismo", "Grigori", "Ahmed", "Roope", "Ahmed", "Karri", "Arto", "Ahmed"];
var counts = {};
for (var i = 0; i < fullnames.length; i++)
{
if (!counts.hasOwnProperty(fullnames[i]))
{
counts[fullnames[i]] = 1;
}
else
{
counts[fullnames[i]]++;
}
}
console.log(counts);Opting for an object instead of an array for storing the counts proves to be a more logical choice in this case.
Assuming fullnames is an array of strings, here is a way to count occurrences:
var nameCounts = { };
for (var i = 0; i < fullnames.length; i++) {
if (typeof nameCounts[fullnames[i]] == "undefined") {
nameCounts[fullnames[i]] = 1;
} else {
nameCounts[fullnames[i]]++;
}
}
console.log(nameCounts); // Outputs something like: {"John": 2, "Alice": 5, ...}
let people = ['Karri', 'Ismo', 'Grigori', 'Karri', 'Ismo', 'Grigori', 'Grigori', 'Karri', 'Ismo', 'Grigori', 'Grigori'];
let counts = [];
people.forEach(function(_person) {
if(typeof counts[_person] === 'undefined') counts[_person] = 1;
else counts[_person]++;
});
let result = [];
for(i in counts) result.push(counts[i]);
console.log(result);
// shows [3, 3, 5]
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