export interface Index {
    [key: string]: any
}

export const createIndex = (arr: any[], key: string): Index => {
    const index: Index = {}
    for (let idx = 0, len = arr.length; idx < len; idx++) {
        index[arr[idx][key]] = idx
    }
    return index
}

export const createMap = (arr: any[], key: string): Index => {
    const index: Index = {}
    for (let idx = 0, len = arr.length; idx < len; idx++) {
        index[arr[idx][key]] = arr[idx]
    }
    return index
}