Util functions from FirebaseData tutorial files

Utils.tsx

const hashCode = str =>
    str
        .split("")
        .reduce((hash, val) => ((hash << 5) - hash + val.charCodeAt(0)) | 0, 0)

export const isChrome =
    /Chrome/.test(navigator.userAgent) && /Google Inc/.test(navigator.vendor)
export const isSafari =
    /Safari/.test(navigator.userAgent) &&
    /Apple Computer/.test(navigator.vendor)


const storageKey = "$$FirebaseDataChat"

function generateUserID() {
    //@ts-ignore
    return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, a =>
        (a ^ ((Math.random() * 16) >> (a / 4))).toString(16)
    )
}

const createNewUserID = () => {
    const newID = generateUserID()
    localStorage.setItem(storageKey, JSON.stringify(newID))
    return newID
}

export const getUserID = () =>
    localStorage.getItem(storageKey)
        ? JSON.parse(localStorage.getItem(storageKey))
        : createNewUserID()