JSFiddle - React, Tailwind, and code Playground

JavaScript

KHWArray = [{"date":"23 Jan 14","hours":12,"mins":"31","score":22},
           {"date":"23 Jan 14","hours":12,"mins":"36","score":22},
           {"date":"23 Jan 14","hours":12,"mins":"44","score":22}
           ]

function removeKeys(obj, keys) {
    keys.forEach(function(key) { delete obj[key] });
    return obj
}


KHWArray = KHWArray.map(function(elem) {
    return removeKeys(elem, ['hours', 'mins'])    
})

console.log(KHWArray)