I have a quick question that I'd like to get some clarity on.
Can someone explain the distinction between these two code snippets:
export const addToCart = function(product, quantity){
cart.push({product, quantity});
console.log(`${quantity} ${product} are added`);
}
and
export const addToCart = function(product, quantity){
cart.push(product, quantity);
console.log(`${quantity} ${product} are added`);
}
Your insight is greatly appreciated. Thank you!
The primary difference lies in pushing an object into an array versus pushing individual items into an array simultaneously.
let arr = [];
arr.push({key1: value1, key2: value2}); // [{key1: value1, key2: value2}]
arr.push(1, 2); // [1, 2]
When it comes to this scenario:
cart.push({product, quantity})
it is essentially the same as:
cart.push({ product: product, quantity: quantity})
The concept of using Shorthand property names was first introduced in ES2015/es6. If a property name matches a variable name (which contains the property value), you can directly assign the variable without repeating the property name while creating the object.
In your situation, you are inserting an object with properties property and quantity into an array named cart.
So upon console logging, you will encounter something like
[{'property': 'bottle', 'quantity': 99 }]On the other hand:
cart.push(product, quantity);
demonstrates adding two elements whose values come from variables product and quantity. When logged on the console, it will appear similar to ['bottle', 99 ]
cart = [];
//cart = [];
const addToCart = function(product, quantity){
cart.push({product, quantity});
console.log(cart);
}
const addToCart2 = function(product, quantity){
cart.push(product, quantity);
console.log(cart);
}
addToCart("product 1", 100); // [ { "product": "product 1", "quantity": 100 }]
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