SOURCE

let arr=["1.0","+","2.0","÷","3","×","10","-","8"]
let result=arr[0]
for(let i=0;i<arr.length;i++){
    switch(arr[i]){
        case "+":
            result=Number(result)+Number(arr[i+1])
            break
        case "-":
            result=Number(result)-Number(arr[i+1])
            break
        case "×":
            result=Number(result)*Number(arr[i+1])
            break
        case "÷":
            result=Number(result)/Number(arr[i+1])
            break
        default:
            break
        
    }
}
console.log(result)