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//this does not work:
    var animal = "moose";

    animal[2]

    animal[2] = 'z'
    animal
    //"moose"

//this kind of worked
    console.log(animal.replace('o', 'z')); //"mzose"
    console.log(animal.replace(/o/g, 'z')); //"mzzse"

//this works for this word
    animal = animal.replace('oo', 'oz') //"mozse"
    console.log(animal);

var animal = "moose"
animal = animal.slice(0, 2) + 'z' + animal.slice(3, animal.length);
console.log(animal);

var animal = "moose"
animal = animal.slice(0, 2) + 'z' + animal.slice(3)
console.log(animal);

//another way
    var animal = "moose"
    var str = "";
    for (var i=0; i<animal.length; i++){
        if (i == 2){
            str += "z";
        }else {
            str += animal[i];
        }
    }

    animal = str;
    console.log(animal);