Preview:
function returnDayKeyValue(val) {
    const returnDayObject = {
        1: "It's monday",
        2: "It's tuesday",
        3: "It's wednesday",
        4: "It's thursday",
        5: "It's friday",
        6: "It's saturday",
        7: "It's sunday",
    }
    if(!returnDayObject[val]){
     return "Enter a value between 1 - 7";
    }
    return returnDayObject[val]
}
cosnt day = 3;
console.log(returnDayKeyValue(day)); //It's wednesday
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