JSON

var lineConstructor = function lineConstructor(input0,input1,input2,input3) {

    return {
        point1: {
            x: input0,
            y: input1
        },

        point2: {
            x: input2,
            y: input3
        },

        calculateLine: function () {
            return (Math.sqrt(Math.abs(this.input0.x - this.input1.x) *
                Math.abs(input2.y - this.input3.y)));
        }
    }

}

var line1 = lineConstructor(3, 4, 5, 6);
var line2 = lineConstructor(-2, -5, 7, 10);

console.log(line1.calculateLine());