How to parseFloat an array object

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I am using this type of array to read data.

var myFood = new Array();     
    function Food(aCode, aRating, aPrice, anImage, aRate, aWeight) {
    this.Image = anImage;
    this.Rating = aRating;
    this.Price = aPrice;

It is then organized in subdata groups which I put in a dropdown select

        myFood[i] = new Food(subdata[0], subdata[1], subdata[2]); 
        var mySelect = document.getElementById("selFood");
    for (i = 0; i < myFood.length; i++) {
        var myOption = document.createElement("option");
        myOption.text = myFood[i].Code;
        myOption.value = i;
        mySelect.add(myOption, null);

Then I display the output

    function chooseFood(){
    var myIndex = document.getElementById("selFood").value;
    document.getElementById("imgFood").src = myFood[myIndex].Image;
    document.getElementById("spnRating").innerHTML = myFood[myIndex].Rate;
    document.getElementById("spnPrice").innerHTML = myFood[myIndex].Price;

Since the "price" data is a number (for example $20.00) how can I reduce every price index before it is displayed. According to the theme there is a 10% off of every price. How can ensure that every object of the array gets that discount.

Pass the "myIndex" value in the method and multiply the price by 90/100

parseFloat(), parseFloat will parse non-string objects if they have a toString or valueOf method. The returned value is the same as if parseFloat had been  parseFloat is a top-level function and not a method of any object. If parseFloat encounters a character other than a plus sign (+), minus sign (-U+002D HYPHEN-MINUS), numeral (0–9), decimal point (.), or exponent (e or E), it returns the value up to that character, ignoring the invalid character and characters following it.

Create one more property named DiscountPercent and then Create a function named DiscountedPrice which takes DiscountPercent and Price as parameters and returns the DiscountedPrice.

function DiscountedPrice(DiscountPercent,Price){
return Price*(100 - DiscountedPrice)/100;

by this you can change the individual Discount Price Later without changing the Code.

JavaScript, Introduction to ElectronJS · How to Sort/Order keys in JavaScript objects ? The parseFloat() is an inbuilt function in JavaScript which is used to accept the string and convert it Input: var n = parseFloat(" 2018 "); Output: n=2018 (floating point Number) The JavaScript | typedArray.every() with Examples · JavaScript | _. The parseFloat() is an inbuilt function in JavaScript which is used to accept the string and convert it into a floating point number. If the string does not contain a numeral value or If the first character of the string is not a Number then it returns NaN i.e, not a number.

The easiest way to implement that is to use the module pattern on your food "class".

To reduce on every food loop the array and call the method on every index.

var myFood = new Array();     
function Food(aCode, aRating, aPrice, anImage, aRate, aWeight) {  
    return {
        Image: anImage,
        Rating: aRating,
        Price: aPrice,
        addDiscount: function(discount) {
           this.Price = this.Price - (this.Price / 100 * discount);   

var i = 0;

myFood[i] = new Food('xxx', '1', 20); 




JavaScript parseFloat() Function, Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java  JavaScript | parseInt() with Examples The parseInt() is an inbuilt function in JavaScript which is used to accept the string ,radix parameter and convert it into an integer.The radix parameter is used to specify which numeral system to be used, for example, a radix of 16 (hexadecimal) indicates that the number in the string should be parsed from a hexadecimal number to a decimal number.

JavaScript Array Reference, The Array object is used to store multiple values in a single variable: var cars = ["​Saab" prototype, Allows you to add properties and methods to an Array object  Arrays in JSON are almost the same as arrays in JavaScript. In JSON, array values must be of type string, number, object, array, boolean or null. In JavaScript, array values can be all of the above, plus any other valid JavaScript expression, including functions, dates, and undefined. Arrays in JSON Objects. Arrays can be values of an object

JavaScript Tip: Cast a Whole Array to a Different Type, Assuming you have an array of strings, which their content is a var result=[]; for (var i=0,l=arr.length;i<l;i++) result.push(+arr[i]); // or parseInt(arr[i]) or the Number function on every item and adds the result into a new array. The parseFloat is used to get a floating value from a string. parseFloat is a top-level function and is not associated with any object. string: Required. A string that represents the value to test. The following example demonstrate how to use parseFloat() function.

Data Type and Type Conversion in JavaScript, For example, typeof array is object , as is typeof null . The parseInt and parseFloat functions return numbers from strings that start with numeric data. Differs from valueOf() as it returns a primitive float value and valueOf() return Float object. Syntax : public static float parseFloat(String val) throws NumberFormatException Parameters : val : String representation of float Throws : NumberFormatException : if String cannot be parsed to a float value in given radix.

  • Since you re using Object which is a good practice why dont you create a PriceDiscount function under this object e.x. Food.prototype.PriceDiscounted = function(){return parseFloat(this.Price) * 10 / 100;}; and then you can call as myFood[myIndex].PriceDiscounted();