The Show
On each iteration, we return the sum of the After the last iteration, the If you have to calculate the sum of arrays often, define a reusable function. The You can also shorten the function we passed to the The arrow function in the example uses an implicit return. An alternative and perhaps simpler approach is to use a Get the Sum of an Array of Numbers using a for...of loopTo get the sum of an array of numbers:
The for...of statement is used to loop over iterable objects like arrays, strings, Notice that we declared the On each iteration, we reassign the If you have to do this often, extract the logic into a reusable function. The You can also use the Get the Sum of an Array of Numbers using 04To get the sum of an array of numbers:
The function we passed to the Array.forEach() method gets called with each element in the array. On each iteration, we reassign the value of the The If you have to calculate the sum of an array's elements often, define a reusable function. The You can also use a basic Get the Sum of an Array of Numbers using a accumulator2 loopTo get the sum of an array of numbers:
We used a basic On each iteration, we use the index to access the current array element and reassign the Which approach you pick is a matter of personal preference. I'd use the In javascript, we can calculate the sum of the elements of the array by using the Array.prototype.reduce() method. The reduced method for arrays in javascript helps us specify a function called reducer function that gets called for each of the elements of an array for which we are calling that function. The output of the reduce() method is a single value that is returned as a collection of all the operations performed on each of the element of the array that is defined in the reducer function. We can use the reduce() function to retrieve the sum of all the array elements by writing a corresponding reducer function that will add the elements of the array and call this reducer function inside the reduce method. In this article, we will learn about how sum of array elements can be calculated using the standard old way of for loop and then by the new optimized, efficient and convenient way of reducing () method along with its syntax and examples. Old Way of the Calculating Sum of Array ElementsBefore the introduction of the reduce() method, we used to calculate the sum of array elements using the for a loop. We would iterate the loop from 0 to the length of the array as indexing of the array starts from 0 and then calculate the sum inside the for a loop. Let us consider one example where we will calculate the total salary of all the employees where the salary of each employee is stored in the array salaries as shown below. Code: Start Your Free Software Development Course Web development, programming languages, Software testing & others
that gives the following output after execution: We can see how the totalSalary variable is added with each of the value of the elements of the salaries array by iterating the for loop to retrieve the sum of the array elements that is the total salary of all the employees. Array.prototype.reduce() MethodNow, we will learn about the reduce() method that will be used for calculating the sum of the array elements. Let us begin by studying its syntax. All in One Software Development Bundle(600+ Courses, 50+ projects) Price 600+ Online Courses | 50+ projects | 3000+ Hours | Verifiable Certificates | Lifetime Access
ExampleLet us consider a simple example of a previous scenario where we wanted to calculate the total salary of all the employees stored in the array format. But now, we will use the reduce() method to calculate the sum instead pf for a loop as shown below. Code:
that gives the following output after execution: Let us consider one more example where we will calculate the total expenditure where values in the array are stored in key-value pair where the key is the expenditure as shown below. Code:
that gives the following output after execution: We can find the total expenditure by using the reduced function as shown above by considering the element. expenditure value. ConclusionWe can calculate the sum of the array elements by using the standard for loop. The most recent, optimized, and efficient way of calculating the sum of array elements is the use the reduce() method in javascript and write a reducer function or callback for it that will return the accumulated value. Recommended ArticlesThis is a guide to Javascript Sum Array. Here we discuss the Introduction, Array.prototype.reduce() Method, and Old Way of the Calculating Sum of Array Elements with examples. You may also have a look at the following articles to learn more – What is sum += in JavaScript?The addition assignment ( += ) operator adds the value of the right operand to a variable and assigns the result to the variable.
How to calculate sum of array in JavaScript?How to find the sum of array elements in JavaScript? To find the sum of array elements in JavaScript, you can use the array. reduce(function(total, currentValue, currentIndex, array), initialValue) method.
How to sum object values in JavaScript?It can be as simple as that: const sumValues = obj => Object. values(obj). reduce((a, b) => a + b, 0);
How do you sum'n numbers in JavaScript?Add n Numbers in JavaScript. <! doctype html> <html> <body> <script> var i, n=5, sum=0; arr = new Array(10, 12, 13, 15, 19); for(i=0; i<5; i++) sum = sum + arr[i]; document.write(sum); </script> </body> </html>. style="display:none;". n = parseInt(document.getElementById("n"). value);. document. ... . temp. ... . |