how to implement add(3).mul(5).divide(3) javascript code example

Example 1: js calculate

answer_Add = 5 + 1; //answer = 6
answer_Sub = 5 - 1; //answer = 4
answer_Multi = 5 * 5; //answer = 25
answer_Divi = 10 / 2; //answer = 5
Total = answer_Add + answer_Sub + answer_Multi + answer_Divi;

Example 2: how to implement add(3).mul(5).divide(3) javascript

<!DOCTYPE html>
<html>
<body>

<p>Result is.</p>

<p id="demo">0</p>

<script>
document.getElementById("demo").innerHTML = add(3).mul(5).divide(5);
function add(num) {
	return {
    mul: function(mulNum) {
    		let mulResult = num * mulNum
            return {
            	divide: function(divNum) {
                	let divResult = mulResult/divNum;
                    return divResult
                }
            }
    	}
    }
}
</script>

</body>
</html>

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