I have an array containing two objects:
let xyz = [
{amount: 1000, rate: 4},
{amount: 100, rate: 2},
{amount: 700, rate: 1}
];
The task is to multiply amount * rate and update the values in the amount key.
Desired output:
let result = [
{amount: 4000, rate: 4},
{amount: 200, rate: 2},
{amount: 700, rate: 1}
];
To easily achieve this, you can utilize the .map() method:
let items = [{cost: 50, quantity: 2}, {cost: 20, quantity: 4},{cost: 30, quantity: 3}];
let totalCosts = items.map(item => ({...item, cost: item.cost * item.quantity}));
console.log(totalCosts);.as-console-wrapper { max-height: 100% !important; top: 0; }Implementing Array.prototype.map():
let dataList = [{amount: 1000, rate: 4}, {amount: 100, rate: 2}, {}, {amount: 700, rate: 1}]
dataList.map(item => {
if(!item.amount || !item.rate){ // Handling empty objects
return item;
}
return {...item, amount: item.amount * item.rate}
});const data = [{amount: 1000, rate: 4}, {amount: 100, rate: 2},{amount: 700, rate: 1}]
let result = data.map(item => {
item.amount = item.amount * item.rate
return item
})
console.log(result)
In order to avoid creating a new Array, you can utilize the forEach method.
let xyz = [
{value: 50, multiplier: 2},
{value: 25, multiplier: 3},
{value: 10, multiplier: 5}
];
xyz.forEach(entry => entry.value = entry.value * entry.multiplier)
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