I'm a new student of programming and I'm trying to figure out an assignment.
I have to write a function that returns values from one array when values from another array are selected by the user on a one-to-one basis.
I've tried the following among other things and it gives a reference error (Apple is not defined; but Apple is an element in the first array).
var valueFromSelect = Apple;
for (var i = 0; i < fruits.length; i++){
if(valueFromSelect == fruits[i]){
console.log(prices[i]);
break
In short, I want to return a price for each fruit that is selected. Here are the arrays:
var fruits = ["Apple", "Orange", "Banana", "Pear", "Pineapple", "Strawberry", "Blueberry"];
var prices = [1.50, 1.20, 1.05, 1.10, 3.00, 0.40, 0.10]
Thank you.
Apple value must be a string if your array contain strings.
var valueFromSelect = "Apple";
var fruits = ["Banana", "Orange", "Apple"];
PS : You can simplify your code by using filter method (from Array prototype) like bellow :
var valueFromSelect = "Apple";
var fruits = ["Banana", "Orange", "Apple"];
var result = fruits.filter(fruit => valueFromSelect == fruit);
This will return you an Array containing each values who matched with items in your Array. so if result.length > 0 you can consider your parameter as 'matched'.
The error you are getting is because in order for JS to understand Apple is a string you have to surround it with " (double quotes) or ' (quotes).
The way it is right now, is telling JS to save into valueFromSelect the value stored in something called Apple which you have not defined yet.
Examples:
'Apple'"Apple"This way it should work:
var valueFromSelect = 'Apple';
for (var i = 0; i < fruits.length; i++){
if(valueFromSelect == fruits[i]){
console.log(prices[i]);
break
Since you want a function that prints the price of a given fruit, you need to create a function that receives the selected fruit as a parameter:
function printFruitPrice(valueFromSelect) {
for (var i = 0; i < fruits.length; i++){
if(valueFromSelect == fruits[i]){
console.log(prices[i]);
break
}
}
}
Then use it like:
printFruitPrice('Apple');