Filter array to remove duplicate values based on condition in javascript [duplicate]

Question

i have an array with dulipacte values

let myArray=[
    {name: "apple", cost: "10"},
    {name: "apple", cost: "20"},
    {name: "bannana", cost: "10"},
    {name: "mango", cost: "20"},
    {name: "apple", cost: "5"},
    {name: "mango", cost: "50"}
    {name: "orange", cost: "30"}
]

and i want to remove duplicates whose cost is low...expected output to be...

let myArray=[
    {name: "apple", cost: "20"},
    {name: "bannana", cost: "10"},
    {name: "mango", cost: "50"}
    {name: "orange", cost: "30"}
]

Thanks in advance

Please refer -> stackoverflow.com/questions/53637425/…

Vijay Prajapati
– Vijay Prajapati

2020-08-25 08:31:34 +00:00
Commented Aug 25, 2020 at 8:31 — Vijay Prajapati
– Vijay Prajapati, Commented Aug 25, 2020 at 8:31
What have you tried so far? Where are you stuck?

Nico Haase
– Nico Haase

2020-08-25 12:18:07 +00:00
Commented Aug 25, 2020 at 12:18 — Nico Haase
– Nico Haase, Commented Aug 25, 2020 at 12:18

Terry Lennox · Accepted Answer · 2020-08-25 08:35:32Z

You can use Array.reduce to get the desired result, we create an object / map with a property for each product name.

If the product stored in the map is of a lower cost or does not exist we replace as we enumerate through the list of products.

We then use Object.values to turn back into an array.

let myArray = [
    {name: "apple", cost: "10"},   
    {name: "apple", cost: "20"},
    {name: "bannana", cost: "10"},
    {name: "mango", cost: "20"},
    {name: "apple", cost: "5"},
    {name: "mango", cost: "50"},
    {name: "orange", cost: "30"}
]

let result = myArray.reduce((res, product) => { 
    
    if (!res[product.name]) {
        // The product does not exist in the map, add it
        res[product.name] = product;
    } else if (Number(res[product.name].cost) < Number(product.cost)) { 
        // A cheaper product exists, replace it. 
        res[product.name] = product;
    }
    return res;
}, {});

console.log(Object.values(result));

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