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 _.round


The _.round() method from the popular JavaScript utility library Lodash is a versatile function for rounding numbers. This method can be used to round any number to a specified number of decimal places or to the nearest whole number.

To use _.round(), simply pass the number you want to round as the first argument and the number of decimal places to round to as the second argument. For example, to round the number 3.14159 to two decimal places, you would call _.round(3.14159, 2). The result of this function call would be 3.14.

If you omit the second argument, _.round() will round to the nearest whole number. For example, _.round(3.6) would return 4, while _.round(3.3) would return 3.

One of the great features of _.round() is that it can handle negative numbers and decimal places specified as negative numbers. For example, _.round(-3.14159, -2) would round the number to the nearest hundred, resulting in -3100.

It's important to note that _.round() uses banker's rounding. This means that if the number being rounded ends in a 5 and the number before the 5 is an even number, the result will be rounded down. For example, _.round(2.5) would return 2, while _.round(3.5) would return 4.

In addition to rounding numbers, _.round() can also be used to round arrays of numbers. If you pass an array as the first argument, _.round() will return a new array with each number rounded to the specified number of decimal places. For example, _.round([3.14159, 2.71828], 2) would return [3.14, 2.72].

Overall, the _.round() method is a versatile, easy-to-use function for rounding numbers and arrays of numbers. It's a useful tool for any developer working with JavaScript and requires no additional dependencies beyond the Lodash library.