Understand Function Javascript-CodePudding

Please help me to understand this code.

function printEven(arr, pow) {
    var res = 1;

    for (var i = 0; i < pow; i  ) {
        res = res * arr;
    }  
    return res;
}

console.log(printEven(4,3))

CodePudding user response：

As far as I can see it is just a custom implementation of an exponential function.

It effectively calculates arr^pow, or in this case 4**3 or 4 * 4 * 4.

At i = 0, res gets multiplied with arr, 1 * 4 = 4.
At i = 2 it will have calculated 4 * 4 * 4, returning 64.

CodePudding user response：

It seems to simply apply a power, so printEven(2,5) returns 2^5 or 32

it's effectly multipling the first input arr to 1 pow times (like 1*2*2*2*2*2)

so console.log(printEven(4,3)) is 64

CodePudding user response：

function printEven(arr, pow) {
var res = 1;
for (var i = 0; i < pow; i  ){
    
        res = res * arr;
    }  
    return res;
}

console.log(printEven(4,3))
console.log(printEven(5,2))

This code is to find "number ^ times"

example 4 ^ 3 = 4 * 4 * 4 = 64

https://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=RBAS_OEXPONENT#:~:text=Used to raise a number to the power of an exponent.