Write a function named evaluateExpression(), that takes three arguments: two operands and an operator, and returns the number that results from applying the operator to the operands.
For example: evaluateExpression(5, 7, ‘+’).
Enter numbers in the fields below and select an operator to evaluate the expression.
$(document).ready(function() {
function getExpression(op1, op2, opr) {
var expressionObject = {};
// Get operands and operator and assign them to expressionObject's properties
expressionObject.operand1 = $(op1).val() * 1;
expressionObject.operand2 = $(op2).val() * 1;
expressionObject.operator = $(opr).val();
return expressionObject;
}
function evaluateExpression(expression) {
var o1 = expression.operand1,
o2 = expression.operand2,
op = expression.operator,
calculator = {
'+': 'The sum of numbers is: <span>' + (o1 + o2) + '</span>.',
'-': 'The difference of numbers is: <span>' + (o1 - o2) + '</span>.',
'*': 'The product of numbers is: <span>' + (o1 * o2) + '</span>.',
'/': 'The division of numbers gives: <span>' + (o1 / o2) + '</span>.',
'=': 'The numbers are equal: <span>' + (o1 === o2) + '</span>.',
'<': 'Operand 1 is less than Operand 2: <span>' + (o1 < o2) + '</span>.',
'>': 'Operand 1 is greater than Operand 2: <span>' + (o1 > o2) + '</span>.'
}
return calculator[op];
}
/**********************************************************************//***** EVENT HANDLING AND CONVENIENCE CODE *****//**********************************************************************/
$('.evaluate').click(function() {
$('.result p').html(evaluateExpression(getExpression('#operand1', '#operand2', '.operator')));
});
});