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Cumulative sum of elements in JavaScript

Suppose, we have an array of numbers like this −

We are required to write a JavaScript function that takes in one such array and returns a new array with corresponding elements of the array being the sum of all the elements upto that point from the original array.

Therefore, for the above array, the output should be −

The code for this will be −

The output in the console −

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Function cumsum #

Compute the cumulative sum of a matrix or a list with values. In case of a (multi dimensional) array or matrix, the cumulative sums along a specified dimension (defaulting to the first) will be calculated.

Parameters #

Type | Description —- | ———–

mean , median , min , max , prod , std , variance , sum

🥣 Cumulative Sum

Solving basic algorithms with plain JavaScript

I am an odd number. Take away one letter and I become even. What number am I?

Cumulative sum interview question.

Create a function that takes an array of numbers and returns a number that is the sum of all values in the array.

Cumulative Sum Implementation

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Now that we've talked about operators. Let's talk about something called the compound assignment operator and I'm going make one little change here in case you're wondering if you ever want to have your console take up the entire window you come up to the top right-hand side here you can undock it into a separate window and you can see that it takes up the entire window.

So just a little bit more room now.

Additionally, I have one other thing I'm going to show you in the show notes. I'm going to give you access to this entire set of assignment operators but we'll go through a few examples here. I'm going to use the entire window just to make it a little bit easier to see.

Let's talk about what assignment is. Now we've been using assignment ever since we started writing javascript code. You're probably pretty used to it. Assignment is saying something like var name and then setting up a name

And that is assignment the equals represents assignment.

Now javascript gives us the ability to have the regular assignment but also to have that assignment perform tasks. So for example say that you want to add items up so say that we want to add up a total set of grades to see the total number of scores. I can say var sum and assign it equal to zero.

And now let's create some grades.

I'm going to say var gradeOne = 100.

and then var gradeTwo = 80.

Now with both of these items in place say that we wanted to add these if you wanted to just add both of them together you definitely could do something like sum = (gradeOne + gradeTwo); and that would work.

However, one thing I want to show you is, there are many times where you don't have gradeOne or gradeTwo in a variable. You may have those stored in a database and then you're going to loop through that full set of records. And so you need to be able to add them on the fly. And so that's what a compound assignment operator can do.

Let's use one of the more basic ones which is to have the addition assignment.

Now you can see that sum is equal to 100.

Then if I do

If we had 100 grades we could simply add them just like that.

Essentially what this is equal to is it's a shorthand for saying something like

sum = sum + whatever the next one is say, that we had a gradeThree, it would be the same as doing that. So it's performing assignment, but it also is performing an operation. That's the reason why it's called a compound assignment operator.

Now in addition to having the ability to sum items up, you could also do the same thing with the other operators. In fact literally, every one of the operators that we just went through you can use those in order to do this compound assignment. Say that you wanted to do multiplication you could do sum astrix equals and then gradeTwo and now you can see it equals fourteen thousand four hundred.

This is that was the exact same as doing sum = whatever the value of sum was times gradeTwo. That gives you the exact same type of process so that is how you can use the compound assignment operators. And if you reference the guide that is included in the show notes. You can see that we have them for each one of these from regular equals all the way through using exponents.

Then for right now don't worry about the bottom items. These are getting into much more advanced kinds of fields like bitwise operators and right and left shift assignments. So everything you need to focus on is actually right at the top for how we're going to be doing this. This is something that you will see in a javascript code. I wanted to include it, so when you see it you're not curious about exactly what's happening.

It's a great shorthand syntax for whenever you want to do assignment but also perform an operation at the same time.

• Documentation for Compound Assignment Operators
• Source code

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JavaScript: 6 Ways to Calculate the Sum of an Array

This practical, succinct article walks you through three examples that use three different approaches to find the sum of all elements of a given array in Javascript (suppose this array only contains numbers). Without any further ado, let’s get started.

Using Array.reduce() method

If you’re using modern Javascript (ES6 and beyond), this might be the neatest and quickest solution.

The reduce() method executes a reducer function for elements of an array. It returns the accumulated result from the last call of the callback function. Below is the syntax:

• total (required): The initial value, or the previously returned value of the function
• current (required): The current element
• current (optional): The index of the current element
• arr (optional): The array that the current element belongs to

Javascript is interesting, and it also has another method quite similar to the reduce() method, named reduceRight() . You can get the sum of a numeric array with only a single line of code like this:

Using a classic For loop

This is an easy-to-understand approach and has been used for decades. However, the code is a bit longer.

Using modern For/Of loop

This approach also uses a loop but is more concise than the previous one. Like the Array.reduce() method, for/of was added to ES6 (JS 2015).

Using the map() method

The Array.map() method is new in ES6 and beyond. This one is very useful when you have to deal with an array, including finding the sum of its elements.

Using a While loop

Another way to sum the elements of an array for your reference (basically, it’s quite similar to other methods of using loops).

Using a forEach loop

Just another kind of loop in Javascript. Here’s how to make use of it to calculate the total value of a given array:

We’ve walked through several ways to get the sum of all elements of a given array in Javascript. Although just one method is enough, knowing the existence of other methods also helps you a lot in mastering the art of programming. Good luck and happy coding!

Next Article: JavaScript: 5 ways to create a new array from an old array

Previous Article: 4 Ways to Remove Duplicates from an Array in JavaScript

Series: Working with Arrays in JavaScript

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Assignment operators assign values to JavaScript variables.

Shift Assignment Operators

Bitwise assignment operators, logical assignment operators, the = operator.

The Simple Assignment Operator assigns a value to a variable.

Simple Assignment Examples

The += operator.

The Addition Assignment Operator adds a value to a variable.

Addition Assignment Examples

The -= operator.

The Subtraction Assignment Operator subtracts a value from a variable.

Subtraction Assignment Example

The *= operator.

The Multiplication Assignment Operator multiplies a variable.

Multiplication Assignment Example

The **= operator.

The Exponentiation Assignment Operator raises a variable to the power of the operand.

Exponentiation Assignment Example

The /= operator.

The Division Assignment Operator divides a variable.

Division Assignment Example

The %= operator.

The Remainder Assignment Operator assigns a remainder to a variable.

Remainder Assignment Example

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The <<= Operator

The Left Shift Assignment Operator left shifts a variable.

Left Shift Assignment Example

The >>= operator.

The Right Shift Assignment Operator right shifts a variable (signed).

Right Shift Assignment Example

The >>>= operator.

The Unsigned Right Shift Assignment Operator right shifts a variable (unsigned).

Unsigned Right Shift Assignment Example

The &= operator.

The Bitwise AND Assignment Operator does a bitwise AND operation on two operands and assigns the result to the the variable.

Bitwise AND Assignment Example

The |= operator.

The Bitwise OR Assignment Operator does a bitwise OR operation on two operands and assigns the result to the variable.

Bitwise OR Assignment Example

The ^= operator.

The Bitwise XOR Assignment Operator does a bitwise XOR operation on two operands and assigns the result to the variable.

Bitwise XOR Assignment Example

The &&= operator.

The Logical AND assignment operator is used between two values.

If the first value is true, the second value is assigned.

Logical AND Assignment Example

The &&= operator is an ES2020 feature .

The ||= Operator

The Logical OR assignment operator is used between two values.

If the first value is false, the second value is assigned.

Logical OR Assignment Example

The ||= operator is an ES2020 feature .

The ??= Operator

The Nullish coalescing assignment operator is used between two values.

If the first value is undefined or null, the second value is assigned.

Nullish Coalescing Assignment Example

The ??= operator is an ES2020 feature .

Test Yourself With Exercises

Use the correct assignment operator that will result in x being 15 (same as x = x + y ).

Start the Exercise

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Answer to Question #170269 in HTML/JavaScript Web Application for manikanta

Arithmetic Operations

Given a constructor function

ArithmeticOperations in the prefilled code and two numbers firstNumber and secondNumber as inputs, add the following methods to the constructor function using the prototype.MethodDescriptionratioOfNumbersIt Should return the ration of the numberssumOfCubesOfNumbersIt Should return the sum of cubes of the numbersproductOfSquaresOfNumbersIt Should return the product of squares of the numbers

• The first line of input contains a number firstNumber
• The second line of input contains a number secondNumber
• The first line of output should contain the ratio of firstNumber and secondNumber
• The second line of output should contain the sum of cubes of firstNumber and secondNumber
• The third line of output should contain the product of squares of firstNumber and secondNumber

Constraints

secondNumber should not be equal to zero

Sample Input 1

Sample Output 1

Sample Input 2

Sample Output 2

i want code in between write code here

"use strict";

process.stdin.resume();

process.stdin.setEncoding("utf-8");

let inputString = "";

let currentLine = 0;

process.stdin.on("data", (inputStdin) => {

 inputString += inputStdin;

process.stdin.on("end", (_) => {

 inputString = inputString.trim().split("\n").map((str) => str.trim());

function readLine() {

 return inputString[currentLine++];

/* Please do not modify anything above this line */

function ArithmeticOperations(firstNumber, secondNumber) {

 this.firstNumber = firstNumber;

 this.secondNumber = secondNumber;

function main() {

 const firstNumber = JSON.parse(readLine());

 const secondNumber = JSON.parse(readLine());

 const operation1 = new ArithmeticOperations(firstNumber, secondNumber);

 /* Write your code here */

 console.log(operation1.ratioOfNumbers());

 console.log(operation1.sumOfCubesOfNumbers());

 console.log(operation1.productOfSquaresOfNumbers());

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Python program to find Cumulative sum of a list

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The problem statement asks to produce a new list whose i^{th} element will be equal to the sum of the (i + 1) elements.

Examples :   

Approach 1 :   We will use the concept of list comprehension and list slicing to get the cumulative sum of the list. The list comprehension has been used to access each element from the list and slicing has been done to access the elements from start to the i+1 element. We have used the sum() method to sum up the elements of the list from start to i+1. Below is the implementation of the above approach :   

Time Complexity: O(n) Auxiliary Space: O(n)

Approach 2:  

Time Complexity: O(n)

Auxiliary Space: O(n)

Alternate approach : Use itertools module

 One approach that is not mentioned in the provided solution is to use the built-in accumulate() function from the itertools module. This function allows you to perform a cumulative sum of the elements in an iterable, and returns an iterator that produces the cumulative sum at each step.

To use this function, you can pass your list as the first argument, and specify the operator.add function as the second argument, which will be used to perform the cumulative sum. Here is an example of how this can be implemented:

Approach: using numpy.cumsum()

note: install numpy module using command “pip install numpy”

NumPy has many mathematical functions one of them is the cumsum() function. This function returns the cumulative sum of the elements in an array along a specified axis.

To use this function, we first need to convert our list into a NumPy array using the numpy.array() function. We can then call the cumsum() function on the resulting array to compute the cumulative sum. Finally, we can convert the resulting NumPy array back into a Python list using the tolist() method.

Output: [10, 30, 60, 100, 150]

Algorithm Analysis: The time complexity of the cumulative_sum() function is O(n), where n is the length of the input list because it involves only one pass over the input list to compute the cumulative sum. The space complexity of the function is also O(n) because it creates a NumPy array of size n to store the cumulative sum.

METHOD 5:Using counter method

The program finds the cumulative sum of a list using the Counter method from the collections module in Python.

1.Create a Counter object from the input list to get the count of each element. 2.Initialize an empty list called cum_sum to store the cumulative sum. 3.Append the first element of the input list to the cum_sum list. 4.Loop over the remaining elements of the input list and compute the cumulative sum by adding the current element to the previous element in the cum_sum list. 5.Append the cumulative sum to the cum_sum list. 6.Return the cum_sum list.

Time complexity:

The time complexity of the program is O(n), where n is the length of the input list. The program has to loop over the input list once to compute the cumulative sum.

Space complexity:

The space complexity of the program is O(n), where n is the length of the input list. The program uses an additional list to store the cumulative sum of the input list.

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