This library is inspired by functional programming - Clojure

The minimum and most straightforward way to check if command exists and where the executable is, without spawning child_process.

Check if artifact exists in remote maven repository

Joining Tables in SQL

mongoose validation to ensure referenced object id exists

🪐 The missing fs.promises.exists(). Also supports case-sensitive/insensitive file paths.

Node module to check if a command-line command exists.

Returns true if a npm package exists in global node_modules.

DEPRECATED REPO!! New place at https://github.com/tunnckocore/opensource! Next release soon will be published! Return positive value if any of passed values exists in array, or optionally an index.

Elaborated examples concerning functional concepts e.g. gadt, eadt, church encodings

Laravel validation rule to check if a custom route key exists.

🧩 Pattern matching objects

Check if a name exists on npm registry

Returns existence of key or value in an object

[OBSOLETE] Checks if an e-mail address exists or not

Check if the binary exists on system

👐 Extended open command with default dir set to current

Check if the node module has exists

Solves routine array actions: get value by key if exists or default; set key if not exists. PHP 5, 7

Utility function to check if a file exists and return a Promise