check if value exist multiple times in a array while in for loop | jquery [duplicate]

Question

I am trying to show a order list in html when I load the order list from the backend. In a for loop the jquery should look if a ordered food exist multiple times.

Currently the list looks like this:

Pizza
Soup
Pizza
Pasta

I want it to show this way:

2x Pizza
Soup
Pasta

I already tried something like this

const allEqual = arr => arr.every(v => v === arr[0]);
allEqual([1,1,1,1]);

Kostas Minaidis · Accepted Answer · 2022-10-21 23:47:23Z

1

Here's one approach:

Create an object named itemCount
Loop over the original list of items
For every item in the list, add a property to the itemCount object named after the item and set its value to 1. Check if the property already exists and if it exists, add 1 to the value.
After you finish iterating over the list, start iterating over the itemCount object, using a method like Object.keys or Object.entries.
For every property in the object, concatenate the property name along with the property value and append the "x" character at the end of the value:

{ Pizza: 3, Soup: 1, ... } => "3x Pizza", etc.

There are many ways to approach this, but I'm just sharing a simple one to try starting with.

answered Oct 21, 2022 at 23:47

Kostas Minaidis

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check if value exist multiple times in a array while in for loop | jquery [duplicate]

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