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You are not using, any values from this.form.items
array.
Change your return statement to,
simply get the value of variable s
inside the reduce method
return this.form.items.reduce((total, item) => {
let s = (item.unit_price - (item.unit_price * item.discount / 100)) * item.quantity;
return total + s;
}, 0);
Source:stackexchange.com