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.

This example implements a Bloom filter in Python, a probabilistic data structure for fast membership testing. Items are added using multiple hash functions that set bits in a fixed-size array. Membership checks return definitely not present or possibly present, with false positives possible. The source code is part of the 127 algorithms collection.

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.

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

🧩 Pattern matching objects

A validation module checking for Gmail account existence

Check if a name exists on npm registry

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

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

Returns existence of key or value in an object

👐 Extended open command with default dir set to current

Check if the node module has exists

🧲 Provides ways of properly checking if a path exists inside a given array of files/directories both on Windows and UNIX-like operating systems. 🗺