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Lodash _.sum


The lodash _.sum method is a utility function in the Lodash library that calculates the sum of values in a given array. It accepts a single argument, which is the array of values to be summed, and returns the sum of all numeric values in the array. If the array contains non-numeric values, they are ignored.

To use this method, first, make sure you have Lodash installed in your project. You can install it using Node Package Manager (npm) by running the command:

npm install lodash

Once you have Lodash installed, you can import the library into your project and use the _.sum method like this:

const _ = require('lodash');

const arrayOfValues = [1, 2, 3, 4, 5];

const sumOfValues = _.sum(arrayOfValues);

console.log(sumOfValues); // Output: 15

As shown in the example above, you can simply pass an array of values to be summed as the argument to the _.sum function, and it will return the total sum of all the values in the array.

One useful feature of the _.sum method is that it can also accept an iteratee function as a second argument. The iteratee function allows you to perform more complex calculations on the array values before summing them up. For example:

const _ = require('lodash');

const arrayOfObjects = [{ value: 1 }, { value: 2 }, { value: 3 }];

const sumOfValues = _.sum(arrayOfObjects, (obj) => obj.value);

console.log(sumOfValues); // Output: 6

In the example above, we passed an array of objects to _.sum and used an iteratee function to extract a specific property value from each object before summing them up.

Overall, the _.sum method is a convenient and powerful way to quickly calculate the sum of values in an array, capable of performing more complex calculations using the optional iteratee function.