JSFiddle - React, Tailwind, and code Playground

JavaScript

function pluck(objects_array, property)
{
    var result = [];
    objects_array.forEach(function(value, index, array){
        for(var some_prop in value){
            if(some_prop == property){
                result.push(value[some_prop]);
            }
        }
    });
    return result;
}

function filter(callback, input_array){
    var result = [];
    input_array.forEach(function(value, index, array){
        if(callback(value)){
            result.push(value);
        }
    });
    return result
}

function count(obj)
{
    return Object.keys(obj).length
}