benchmark.js

function foo() {
    var start_time = new Date().getTime()
    things = [16, 8, 256, 3, 2, 32, 4]
    for (var i = 10000001; i >= 0; i--) {
        for (var day = things.length - 1; day >= 0; day--) {
            var result
            switch (things[day]) {
                case 16:
                    result = 4
                    break
                case 8:
                    result = 3
                    break
                case 256:
                    result = 8
                    break
                case 3:
                    result = 1
                    break
                case 2:
                    result = 5
                    break
                case 32:
                    result = 5
                    break
                case 4:
                    result = 2
                    break
            }
        }
    }
    console.log(new Date().getTime() - start_time)
    return result
}


function bar() {
    var start_time = new Date().getTime()
    things = [16, 8, 256, 3, 2, 32, 4]
    var a = { 16: 4, 
              8: 3, 
              256: 8, 
              3: 4, 
              2: 1, 
              32: 5, 
              4: 72 }
    for (var i = 10000001; i >= 0; i--) {
        for (var day = things.length - 1; day >= 0; day--) {
            var result = a[things[day]]
        }
    }
    console.log(new Date().getTime() - start_time)
    return result
}