rangeFunction.js

gistfile1.txt

function sum(array=[]){    
    // Todo
    // Only if numeric array
    console.log("typeof: " + typeof array);
    var sum = 0;
    for(var index=0; index < array.length; index++){
        sum += array[index];
    }
    return sum;
}

// So what is the arguments object?
// Basically, an Array-like object corresponding to the arguments passed to a function.
// I thought that using arguments would be the best as a solution to a function using default values
// So then, given the numbers of arguments passed into the range() function, 
// The if-statement will reorganize them all to produce the same effect that the range() function does in Python
// Am I being clear? 
// Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments

// After finishing this challenge, without cheating, I did some searches online to check how others are dealing with.
// What I found interesting is that, basically, you are free to write weird stuff in JavaScript
// Well, at least for me... But somehow what I call "weird" usually reduces a lot of typing.
// For example, the Ternary operator is kind of cool. It helps a lot, and many others used to code the range() function
// But still, I don't know if those answer are too simple or if I'm just looking for complexity
// I tend to write a lot of code sometimes, and most of them are repetitive
// Anyway, but even the other functions using ternary operator couldn't handle a function call like the following:
// range(10) would return an empty array, but I want it to return [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]


// Parameters without defaults after default parameters
// I don't know if this is some kind of convention, but usually parameters without defaults value are set left-to-right
// The first time I tried I probably did something wrong,
// I still think I can make the function work reordering the parameters as (start=0, stop, step=[1])


function range(stop, start=0, step=1){
    console.log("Range(start=" + start + ", stop=" + stop + ", step=" + step + ")");
    var index;
    for(index = 0; index < arguments.length; index++){
        if(typeof arguments[index] == 'number'){
            if(arguments.length == 1){
                stop  = arguments[0];
            } else if (arguments.length == 2){
                start = arguments[0];
                stop  = arguments[1];
            } else if (arguments.length == 3){
                start = arguments[0];
                stop  = arguments[1];
                step  = arguments[2];
            }
        } else {
            if(arguments.length > 1){
                console.log("Invalid argument given: " + arguments[index]);
            } else {
                console.log("Invalids arguments given: " + arguments[index]);
            }
        }
        console.log("start= " + start + ", stop= " + stop + ", step= " + step);
        console.log("...");
    } 
            

    var rangeArray = [];
    while(start <= stop){
        rangeArray.push(start);
        start += step;
    }
    console.log("return:");
    return rangeArray;
}

console.log(range());
console.log(range('a'));
console.log(10, 'a');
console.log(range(10));
console.log(range(1, 10));
console.log(range(1, 10, 2));
console.log(sum(range(1, 10)));