JSFiddle - React, Tailwind, and code Playground

JavaScript

traveler = [
        {  description: 'Senior', Amount: 50},
        {  description: 'Senior', Amount: 50},
        {  description: 'Adult', Amount: 75},
        {  description: 'Child', Amount: 35},
        {  description: 'Infant', Amount: 25 },
    ];
        
    Array.prototype.sum = function (prop) {
        var total = 0
        for ( var i = 0, _len = this.length; i < _len; i++ ) {
            total += this[i][prop]
        }
        return total
    }
        
    console.log(traveler.sum("Amount"))