in javascript and in solidity if you need to get gata from array index you can write like that let data = array[ index ] but in the testing phase, i saw javascript got data from array like this array ( index )

my array in solidity address[] public funders;

while testing in hardhat via JS

 it("add funders to array funders array", async () => {
        await fundMe.fund({ value: sendValue })
        let funder = await fundMe.funders(0)

        assert.equal(funder, deployer)
    })

array works like that array [ index ] but how is this working. ????? it shows error if i use [ ] to get data from array.