helpers4 vs Lodash — Detailed Comparison

Lodash is the most widely-used JavaScript utility library, with ~300 functions covering arrays, objects, strings, and functional-programming helpers. It predates ES2015 and still targets ES5 compatibility.

This page details the differences to help you decide whether you need helpers4, lodash, or both.

Philosophy

	helpers4	lodash
Goal	Domain-specific helpers not found in general toolkits	Maximalist, legacy-compatible utility belt
TypeScript	Native strict types, no `any`	Requires `@types/lodash` (community-maintained, can lag)
Tree-shaking	Built-in — separate `@helpers4/*` packages per category	Requires the `lodash-es` variant; the default `lodash` package is not tree-shakable
Target runtime	Modern JS (ES2024+)	ES5-compatible
Dependencies	Zero runtime dependencies	Zero dependencies
License	LGPL-3.0	MIT

Key philosophical difference

Lodash was built for a JavaScript ecosystem that no longer exists in the same form — no native Array.prototype.flat, no optional chaining, no Promise. Much of its surface area now duplicates what’s built into the language. helpers4 assumes a modern runtime and only exists to fill gaps native JS and lodash both leave open: dates, URLs, semver, observables, typed promise guards.

What helpers4 adds that lodash doesn’t have

Date utilities (`@helpers4/date`)

Function	Description
`compare`	Compare two dates with configurable precision
`difference`	Difference between two dates in a given unit, with sign
`isSameDay` / `isSameMonth` / `isSameYear`	Calendar-based equality checks
`ensureDate`	Parse dates safely (handles timestamps in seconds)
`toISO8601` / `toRFC2822` / `toRFC3339`	Format dates to standard formats
`timeAgo`	Human-readable relative time
`isBusinessDay` / `isWeekend`	Calendar predicates

lodash has no date utilities — it explicitly recommends pairing it with a separate date library.

URL utilities (`@helpers4/url`)

Function	Description
`cleanPath`	Normalize a URL path
`extractPureURI`	Strip query params and fragments
`onlyPath`	Extract the path from a full URL
`relativeURLToAbsolute`	Convert relative URLs to absolute
`withLeadingSlash` / `withoutLeadingSlash`	Ensure/remove leading slash
`withTrailingSlash` / `withoutTrailingSlash`	Ensure/remove trailing slash

lodash has no URL utilities.

Version / Semver utilities (`@helpers4/version`)

Function	Description
`parse`	Parse a semver string into components
`compare`	Compare two semver versions
`increment`	Bump major/minor/patch
`satisfiesRange`	Check if a version satisfies a range

lodash has no semver utilities.

Observable utilities (`@helpers4/observable`)

Function	Description
`combine`	Combine multiple observables into one
`combineLatest`	Combine latest values from multiple observables

lodash has no RxJS / observable utilities.

Promise guards (`@helpers4/promise`)

Function	Description
`truthyPromiseOrThrow`	Assert a promise resolves to a truthy value
`falsyPromiseOrThrow`	Assert a promise resolves to a falsy value
`meaningPromiseOrThrow`	Assert a promise resolves to a non-empty value
`retry`	Retry a failing async function
`settle`	Partition fulfilled/rejected outcomes without failing fast

lodash predates native Promise combinators and has no promise utilities at all.

Where they overlap

For functions that exist in both libraries, here’s how they compare:

Array

helpers4	lodash	Notes
`chunk`	`chunk`	Same concept
`unique`	`uniq`	Same concept
`difference`	`difference`	Same concept
`intersection`	`intersection`	Same concept
`equalsDeep`	`isEqual`	Same concept (deep equality)
`createSortBy*Fn`	`sortBy`	helpers4 provides typed sort function factories per data type; lodash’s `sortBy` takes an iteratee

Object

helpers4	lodash	Notes
`cloneDeep`	`cloneDeep`	Same concept
`mergeDeep`	`merge`	Same concept
`get`	`get`	Same concept, but helpers4 is dependency-free and type-narrows the result
`set`	`set`	Same concept
`pick` / `omit`	`pick` / `omit`	Same concept
`flatten` / `unflatten`	—	helpers4 only

String

helpers4	lodash	Notes
`camelCase`	`camelCase`	Same concept
`capitalize`	`capitalize`	Same concept
`kebabCase`	`kebabCase`	Same concept
`snakeCase`	`snakeCase`	Same concept
`truncate`	`truncate`	Same concept
`dedent`	—	helpers4 only

Function

helpers4	lodash	Notes
`debounce`	`debounce`	Same concept
`throttle`	`throttle`	Same concept
`memoize`	`memoize`	Same concept
`curry`	`curry`	Same concept

Number

helpers4	lodash	Notes
`clamp`	`clamp`	Same concept
`roundTo`	`round`	Same concept

Type checking

helpers4	lodash	Notes
`isArray`	`isArray`	Same
`isBoolean`	`isBoolean`	Same
`isDate`	`isDate`	Same
`isFunction`	`isFunction`	Same
`isNumber`	`isNumber`	Same
`isPlainObject`	`isPlainObject`	Same
`isString`	`isString`	Same

What lodash has that helpers4 doesn’t

Lodash’s collection-chaining API (_(arr).map(...).filter(...).value()) and its more exhaustive “deep get with default” (_.get(obj, path, defaultValue)) semantics have no direct helpers4 equivalent — helpers4 deliberately doesn’t attempt to replace lodash’s full surface, only to cover what it and native JS leave out.

When to use which

Scenario	Recommendation
You need date formatting/comparison	helpers4 (`@helpers4/date`)
You need URL path manipulation	helpers4 (`@helpers4/url`)
You need semver parsing/comparison	helpers4 (`@helpers4/version`)
You need RxJS observable combinators	helpers4 (`@helpers4/observable`)
You need typed promise guards/retry	helpers4 (`@helpers4/promise`)
You need ES5 compatibility, or `_.get` with defaults / chaining	lodash
Maximum function coverage, legacy codebase already on lodash	lodash
Modern app, want to shed lodash’s dead weight	helpers4 + es-toolkit for the general-purpose parts

Summary

Lodash is the maximalist, battle-tested option for legacy compatibility and sheer function coverage. helpers4 is modern, minimal, and focused specifically on the domain gaps (dates, URLs, semver, observables, promise guards) that lodash — built for a pre-ES2015 world — never aimed to cover.