add after ary assign assignIn assignInWith assignWith at before bind bindAll bindKey camelCase capitalize castArray ceil chain chunk clamp clone cloneDeep cloneDeepWith cloneWith compact concat conformsTo countBy create curry curryRight debounce deburr defaults defaultsDeep defer delay difference divide drop dropRight each eachRight endsWith entries entriesIn eq escape every extend extendWith fill filter find findIndex findKey findLast findLastIndex findLastKey first flatMap flatMapDeep flatMapDepth flatten flattenDeep flattenDepth flip floor forEach forEachRight forIn forInRight forOwn forOwnRight fromPairs functions functionsIn get groupBy gt gte has hasIn head inRange includes indexOf initial intersection invert invertBy invoke invokeMap isArguments isArray isArrayBuffer isArrayLike isArrayLikeObject isBoolean isBuffer isDate isElement isEmpty isEqual isEqualWith isError isFinite isFunction isInteger isLength isMap isMatch isMatchWith isNaN isNative isNil isNull isNumber isObject isObjectLike isPlainObject isRegExp isSafeInteger isSet isString isSymbol isTypedArray isUndefined isWeakMap isWeakSet join kebabCase keyBy keys keysIn last lastIndexOf lowerCase lowerFirst lt lte map mapKeys mapValues max maxBy mean meanBy memoize merge mergeWith min minBy multiply negate nth omit omitBy once orderBy overArgs pad padEnd padStart parseInt partial partialRight partition pick pickBy pull pullAll pullAllBy pullAllWith pullAt random rearg reduce reduceRight reject remove repeat replace rest result reverse round sample sampleSize set setWith shuffle size slice snakeCase some sortBy sortedIndex sortedIndexOf sortedLastIndex sortedLastIndexOf sortedUniq split spread startCase startsWith subtract sum sumBy tail take takeRight tap template throttle thru toArray toFinite toInteger toLength toLower toNumber toPairs toPairsIn toPlainObject toSafeInteger toString toUpper transform trim trimEnd trimStart truncate unary unescape union uniq uniqBy uniqWith unset unzip unzipWith update updateWith upperCase upperFirst values valuesIn without words wrap wrapperAt wrapperChain wrapperCommit wrapperFlatMap wrapperLodash wrapperNext wrapperPlant wrapperReverse wrapperToIterator wrapperValue xor zip zipObject zipObjectDeep zipWith

Lodash _.sum

Overview

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.