// this is the input. need to iterate the tech based name from object

let obj=[
        {
        name:"Nithesh",
        tech:["HTML","CSS","JAVA","JS"],
        },
        {
        name:"hari",
        tech:["NodeJS","CSS","React","JS"],
        },
        {
        name:"sathish",
        tech:["Angular","CSS","React","HTML"],
        }
    ]

//and output like this. but I tried all ways but code is not working

o/p={
    "HTML":["Nithesh","sathish"],
    "CSS":["Nithesh","hari", "sathish"],
    "JS":["Nithesh","hari"],
    "React":["hari", "sathish"],
    "NodeJs":["hari"],
    "Angular":["sathish"],
    "JAVA":["Nithesh"],
    }