How can I utilize the setter method to update existing values of an object and perform mathematical operations?
var obj = {
set model(object) {
//method's logic
}
};
obj = {x:10, y: 20, p: 15};
obj = {
x:10,
y: 20,
p: 15
set model(object){
//method logic
}
};
obj.model = { x: { value: 33, operation: '*' },
z: { value: 75, operation: '+' },
p: { value: 4, operation: '%' } };
console.log(obj); // -> {x:330, y: 20, z: 75, p: 3}
When you write obj = {x:10, y: 20, p: 15};, it's not actually passing arguments to the object. Instead, it's simply assigning these values directly to the variable obj, overwriting any previous value it had.
To properly add properties to an existing object without losing its current value, you should use the following syntax:
obj.model = {x:10, y: 20, p: 15};
There is an alternative approach to dealing with this situation.
let obj = {
set model(object) {
Object.keys(object).forEach(key => {
if (typeof obj[key] === 'undefined' || typeof object[key] !== 'object') {
obj[key] = typeof object[key] === 'object'
? object[key].value
: object[key];
} else {
obj[key] = eval(obj[key] + object[key].operation + object[key].value);
}
});
}
}
obj.model = {x:10, y: 20, p: 15};
obj.model = { x: { value: 33, operation: '*' },
z: { value: 75, operation: '+' },
p: { value: 4, operation: '%' } };
// Adding new value(s)
obj.model = { a: 123 };
console.log(obj); // -> {x:330, y: 20, z: 75, p: 3}
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