stackoverflow/weakmap-muse at main · javascript-2020/stackoverflow · GitHub

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                                                                                console.clear();

        var map   = new WeakMap();

        var a   = document.createElement('div');
        map.set(a,()=>'hello');

        console.log(map.get(a)());

  //:

        var mem     = [];
        mem.rnd     = ()=>Math.random();
        mem.add     = (node,fn,index)=>(index=mem.rnd(),mem.push({index,node,fn}),index);
        mem.rem     = node=>(i=mem.findIndex(o=>o.node===node)) ?? mem.splice(i,1,0);
        mem.get     = node=>mem.find(o=>o.index==node.dataset.index);

        var div             = document.createElement('div');
        div.dataset.index   = mem.add(div,()=>'world');

        console.log(mem.get(div).fn());

        mem.rem(div);


//


        mem.rem     = (node,i)=>(i=mem.findIndex(o=>o.node===node),mem.splice(i,1));