The sum of a range using Javascript

The sum of a range using Javascript

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I wish to execute a program with output as :

console.log(range(1, 10));  
// → [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]  
console.log(range(5, 2, -1));  
// → [5, 4, 3, 2]  
console.log(sum(range(1, 10)));  
// → 55  

I am getting an error for array.length.Please find the code below:

var array = [];

function range (arr){  
    var lower = Math.min(arr[0],arr[1]);    
    var upper = Math.max(arr[0],arr[1]);  

    for (var i=lower;i<=upper;i++){  
        array.push(i);  
    }  
}  

function sum(array){  
    for(var i=0;i < array.length;i++){  
        var total = total+array[i];  
    }  
}  

console.log(sum(range(1, 10)));  

I am at begineers level, please do help. Thanks.


You have a few problems here:

1.) You aren't returning anything in your range function. You need to return the filled array.

2.) You aren't passing the array correctly in the sum function call.

3.) You aren't returning anything in your sum function call.

Without returning any values, you aren't letting your code blocks work with eachother

var array = [];

function range (arr){  
    var lower = Math.min(arr[0],arr[1]);    
    var upper = Math.max(arr[0],arr[1]);  

    for (var i=lower;i<=upper;i++){  
        array.push(i);  
    }
    return array; // return the array to be used in the sum function
}  

function sum(array){  
    var total = 0; // need to create a variable outside the loop scope
    for(var i in array){  
       total = total+array[i];  
    }
    return total;
}  

console.log(sum(range([1,10]))); // pass the array correctly 

Note that you need to set the total variable outside the scope of the for-loop within the sum function. That way you can return the final value. Otherwise, it would return undefined.

See the fiddle: https://jsfiddle.net/udyhb95a/

Sum All Numbers in a Range Problem - JavaScript, Your logic is not correct. Your code only sums each number in the array twice. It is pure coincidence you passed the first test. The test call of  sum(x,y) range(x,y,step) rangeSum (start, end) sum will give you the sum of two numbers. range will give you an array of numbers from x to y, with an optional step argument that dictates the increment to use when listing the range. If no step is given, the default value is 1. rangeSum will give you the sum of a range of numbers from start to end.


  1. You need to pass an array when calling the range function you defined range([1, 10])

  2. You need to rewrite your sum function

As a side note, there are more efficient ways to compute the sum of a range of elements without iterating on them.

function sum_of_range(start, end) {
    return end * (end + 1) / 2 - start * (start + 1) / 2;
}

Edit:

Here is a working sum function

function sum(array) {
    var accumulator = 0;
    for (var i = 0; i < array.length; ++i)
        accumulator += array[i];
    return accumulator;
}

Range Sum ― Scotch.io, Not JavaScript! In this challenge, we implement our own helper function for summing up numbers within a specified range. The range is specified using an array  JavaScript exercises, practice and solution: Write a JavaScript function to calculate the sum of values in an array.


You need to modify sum & range function

function range (){
    var array = []; 
    var lower = Math.min.apply(null, arguments);    
    var upper = Math.max.apply(null, arguments);    

    for (var i=lower;i<=upper;i++){  
        array.push(i);  
    }
    return array;  
} 

function sum(array){  
    return  array.reduce((x,y)=>x+y,0);
} 

console.log(range(1, 10)); 
// [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
console.log(range(5, 2, -1)); //if we are considering min & max from params
// [-1, 0, 1, 2, 3, 4, 5]
console.log(sum(range(1, 10)));
// 55

Sum of a range, console.log(sum(range(1, 10)));. 10. Write a range function that takes two arguments, start and end, and returns an array containing all the numbers from start up  JavaScript: Compute the sum of the two given integers. Last update on February 09 2019 08:31:28 (UTC/GMT +8 hours) Write a JavaScript program to compute the sum of the two given integers. If the two values are same, then returns triple their sum.


Here you declare a function with one parameter as an array

function range (arr){ 
      ...

But here you call a function with two arguments as numbers

console.log(range(1, 10)); 

Use this call function

console.log(range([1, 10])); 

And don't use for..in for arrays

for(var i in array){ it doesn't work as you expect 

Use forEach function or plan for loop

Also you have some error in sum function

See working example below:

function range(arr) {
    var array = [];
    var lower = Math.min(arr[0], arr[1]);
    var upper = Math.max(arr[0], arr[1]);

    for (var i = lower; i <= upper; i++) {
        array.push(i);
    }
    return array;
}

function sum(array) {
    var total = 0;
    for (var i  = 0; i < array.length; i++) {
        total = total + array[i];
    }
    return total;
}

document.write('range ' + range([1, 10]) + '<br>');
document.write('sum ' + sum(range([1, 10])));

sum, range and rangeSum functions, I did here since it might be a good way to learn to be cautious about types even in 'typeless' Javascript. So following code does both type checking and accepting  In this article we’ll explore four plug and play functions that allow you to easily find certain values in an arrays of numbers. Specifically we’ll explore the following: Finding the Sum of all values in an Array. Returns the minimum value in a given array. Math is a built in object in JavaScript that contains certain methods useful for


Hello Dear check it now.

                var array = [];

                function range(arr, arr1) {
                    var lower = Math.min(arr);
                    var upper = Math.max(arr1);
                    for (var i = lower; i <= upper; i++) {
                        array.push(i);
                    }
                }

                function sum() {
                    var total = 0;
                    for (var i = 0; i < array.length; i++) {
                        total = total + array[i];
                    }
                    return total;
                }
                console.log(sum(range(1, 10)));

Sum all numbers in a range, Sum all numbers in a range · javascript programming-challenge array. I have implemented the "Sum All Numbers in a Range" challenge from Free Code Camp  range is a function that basically takes in a starting index and ending index then return a list of all integers from start to end. The most obvious way would be using a for loop. As a fan of FP, let's come up with an recursive solution. So the base case is obviously when the start and end are the same, the answer would simply be [start].


4.1 Sum of a Range (Eloquent JavaScript Solutions) · GitHub, step parameter is optional. // if step is not passed in,. // and start is less than or equal to end,. // then step = 1, else step = -1. function range(start  Does JavaScript have a method like “range()” to generate a range within the supplied bounds? Ask Question Asked 9 years, 6 months ago.


Sum of Numbers in a Range -- JavaScript -- Free Code Camp , Learn how to solve the freeCodeCamp algorithm 'Sum All Numbers in a Range' using the Array.sort() JavaScript method and a for-loop. The reduce() method reduces the array to a single value. The reduce method executes a provided function for each value of the array (from left-to-right). The return value of the function is stored in an accumulator (result/total). Note: reduce does not execute the function for array elements without values.


Sum All Numbers in a Range - freeCodeCamp Algorithm, You are given an array that contains two integers. The goal of the function is to return the sum of all numbers between (and including) those two numbers. Sum Numbers Between 1 and a Given Number Using Recursion - Javascript -3 Javascript function that calculates the sum of all numbers (using a faster run time performance)