rambda/src/_internals/set.js

Lightweight and faster alternative to Ramda with included TS definitions

import { _indexOf } from '../equals.js'
import { type as typeMethod } from '../type.js'

export class _Set {
  constructor() {
    this.set = new Set()
    this.items = {}
  }

  checkUniqueness(item) {
    const type = typeMethod(item)
    if (['Null', 'Undefined', 'NaN'].includes(type)) {
      if (type in this.items) {
        return false
      }
      this.items[type] = true

      return true
    }
    if (!['Object', 'Array'].includes(type)) {
      const prevSize = this.set.size
      this.set.add(item)

      return this.set.size !== prevSize
    }

    if (!(type in this.items)) {
      this.items[type] = [item]

      return true
    }

    if (_indexOf(item, this.items[type]) === -1) {
      this.items[type].push(item)

      return true
    }

    return false
  }
}