An assortment of elements with conditional statements

Question

An assortment of elements with conditional statements

Can anyone help me with a function that returns the price of an item from a list?

What happens if the item is not in the list? If it isn't, I want to display

"No item found with that name"

Any suggestions on how to achieve this?

let items = [{
    itemName: "Effective Programming Habits",
    type: "book",
    price: 13.99
  },
  {
    itemName: "Creation 3005",
    type: "computer",
    price: 299.99
  },
  {
    itemName: "Finding Your Center",
    type: "book",
    price: 15.00
  }
]

function priceLookup(array, item) {
  let results = 0;
  for (let i = 0; i < array.length; i++) {
    if (array[i].itemName === item) {
      results = array[i].price
    }
  }
  return results;
}

javascript arrays for-loop object if-statement

Answer 1

Answer №1

Here is an alternative version of the lookup function you provided:

function searchPrice(arr, target) {
  for (let j = 0; j < arr.length; j++) {
    if (arr[j].product === target) {
      return arr[j].cost
    }
  }
  return "Item not found";
}

Answer 2

Here is an alternative version of the lookup function you provided:

function searchPrice(arr, target) {
  for (let j = 0; j < arr.length; j++) {
    if (arr[j].product === target) {
      return arr[j].cost
    }
  }
  return "Item not found";
}

Answer 3

Answer №2

One way to approach this is by changing the logic as follows:

Rather than returning the price with a default value of 0, set it to null.
Scenario #1: If the item is found, return the actual price from the array.
Scenario #2: If the item is not found, return the price as null, and then you can easily check for that and set a default value like this:
```
priceLookup(items, "abc") || "No item found with that name"
```

let items = [{itemName:"Effective Programming Habits",type:"book",price:13.99},{itemName:"Creation 3005",type:"computer",price:299.99},{itemName:"Finding Your Center",type:"book",price:15}];

function priceLookup(array, item) {
  let results = null;
  var foundItem = array.find(a => a.itemName === item);
  if (foundItem)
    results = foundItem.price;
  return results;
}

console.log( priceLookup(items, "Creation 3005") )
console.log( priceLookup(items, "abc") || "No item found with that name" )

Alternatively, you can achieve the same result with less code:

let items = [{itemName:"Effective Programming Habits",type:"book",price:13.99},{itemName:"Creation 3005",type:"computer",price:299.99},{itemName:"Finding Your Center",type:"book",price:15}];

function priceLookup(array, item) {
  return (array.find(a => a.itemName === item) || {}).price;
}

console.log( priceLookup(items, "Creation 3005") )
console.log( priceLookup(items, "abc") || "No item found with that name" )

Answer 4

One way to approach this is by changing the logic as follows:

Rather than returning the price with a default value of 0, set it to null.
Scenario #1: If the item is found, return the actual price from the array.
Scenario #2: If the item is not found, return the price as null, and then you can easily check for that and set a default value like this:
```
priceLookup(items, "abc") || "No item found with that name"
```

let items = [{itemName:"Effective Programming Habits",type:"book",price:13.99},{itemName:"Creation 3005",type:"computer",price:299.99},{itemName:"Finding Your Center",type:"book",price:15}];

function priceLookup(array, item) {
  let results = null;
  var foundItem = array.find(a => a.itemName === item);
  if (foundItem)
    results = foundItem.price;
  return results;
}

console.log( priceLookup(items, "Creation 3005") )
console.log( priceLookup(items, "abc") || "No item found with that name" )

Alternatively, you can achieve the same result with less code:

let items = [{itemName:"Effective Programming Habits",type:"book",price:13.99},{itemName:"Creation 3005",type:"computer",price:299.99},{itemName:"Finding Your Center",type:"book",price:15}];

function priceLookup(array, item) {
  return (array.find(a => a.itemName === item) || {}).price;
}

console.log( priceLookup(items, "Creation 3005") )
console.log( priceLookup(items, "abc") || "No item found with that name" )

An assortment of elements with conditional statements

Answer №1

Answer №2

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