![]() ![]() When it’s finished, it assigns the total value to the constant totalCosts. The sumBy method looks at the cars array and iterates through each element, summing the value of the cost parameter. Each object has three parameters, name, cost, and issuv. In this example, we have an array named cars that holds three objects. In Example 1, we can get a more precise look at how the syntax works. Let’s take a look at a few examples that use the Lodash sumBy method to get a better handle on this feature. The second argument is the object property, or iteratee, that you want to sum. The first argument is the array that holds the values. The Lodash sumBy method takes two arguments. Extra variables are never desirable, and using many for-loops causes a lot of duplicate code, which goes against the programmer’s DRY (Don’t Repeat Yourself) philosophy. You could use native JavaScript to get the total, but you would need to use a for-loop and introduce new variables into the scope of your project. Sometimes an object has a property that is a numerical value, and you may need to calculate a total of those values. Often, you may find yourself working with large arrays filled with objects. These examples assume that you already know what Lodash is, and that you have it loaded in your project. ![]() In this article, you will learn about the Lodash sumBy method, and how it can be helpful in your website or application. The Lodash sumBy method allows you to add the values of the objects in your array, specifying the objet property that should be targeted. ![]()
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