Array might not be the right data structure for you

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Array might not be the right data structure for you Map as a better data structure than array

  • Web development open to almost everyone able to do a bit of logical thinking
  • no need to come from a technical background
  • few things I am seeing people miss that might be obvious to other with technical background (ie Bachelor or Masters in Science)
  • poor choice in data structure
  • example with add to cart
  • This example is in react/react native but concept apply to most tech
addCartItem: (state, action) => {
 state.items.push({product, quantity})
}
  • Then we want to increment quantity when same product added
  • the first thought or obvious solution
 addCartItem: (state, action) => {
 const newProduct = action.payload.product
const productIndex = state.items.findIndex(item => item.product.id == newProduct.id)
if (productIndex != -1) {
 state.items[productIndex].quantity++
} else {
 state.items.push({product: newProduct, quantity: 1})
}

  • let’s say now you want to change quantity (plus or minus)
changeQuantity: (state, action) {
 const {productId, amount} = action.payload
 const index = state.items.findIndex(item => item.product.id == productId)
 if (index != -1) {
 state.items[index].quantity += amount
 if (state.items[index].quantity # # <= 0) {
 state.items.splice(index, 1)
 }
 }

}