Here is Array
Product Details = [{Amount: '49.95'}, {Amount: ''}]
Here is Javascript used:
function() {
var prods = {{Product Details}}; // Product Araay
var Amount = 0;
var i, len;
for (i = 0, len = prods.length; i < len; i++) {
Amount += parseInt(prods[i].Amount);
}
return Amount;
}
============= Result ==============
NaN
0 if its a falsy value.parseFloat instead of parseInt because you have float values :)var Details = [{Amount: '49.95'}, {Amount: ''}, {Amount: '15.25'}]
function sums () {
var prods = Details; // Product Array
var Amount = 0;
var i, len;
for (i = 0, len = prods.length; i < len; i++) {
Amount += parseFloat(prods[i].Amount || 0);
}
return Amount;
}
console.log(sums())You are getting NaN as a result because you are calling parseInt on an empty string for the second element, which returns NaN. Adding anything else to NaN will still be NaN.
If you are using decimal numbers, you might want to use parseFloat() to keep the total exact.
products = [{ Amount: '49.95' }, { Amount: '12.32' }];
function sum() {
let amount = 0;
for (let i = 0; i < products.length; i += 1) {
console.log(products[i].Amount);
amount += parseFloat(products[i].Amount);
}
return amount;
}
There is unary + operator which can replace parseInt/parseFloat:
+'' === 0
Just for information, don't recommend to use it as it is less obvious.
If you notice your array's second element has {Amount: ''}. parseInt('') results in NaN, and any more math operations on NaN with result in NaN.
To avoid this, you can change the code to Amount += parseInt(prods[i].Amount) || 0; Else you can use the unary + operator.
The fastest way to convert a string to a number in JavaScript is to use the unary + operator, which works for floating point numbers as well.
Amount += +prods[i].Amount;
