@bitbite/filtered-list/src/Memoized.ts

filter a list of items

function hashFn(...params: any[]): string {
    return params.map( param => {
        if (typeof param === 'string') return param;
        if (typeof param === 'number') return String(param);
        if (typeof param === 'function') return param.constructor.name;
        if (Array.isArray(param)) return param.toString()
        if (typeof param === 'object') return JSON.stringify(param)
    }).join('_')
}

export const Memoized = (function (store: { [key:string]: any }) {
    return function (fn: Function, onMemoized?: Function): Function {
        return (...params: any[]) => {
            const key = hashFn(params)
            if (key in store) {
                onMemoized && onMemoized(store[key])
                return store[key]
            };
            store[key] = fn(...params)
            return store[key];
        }
    }
})({ /** empty store */ })