JS Snippets: Array of Objects: Difference between revisions

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Line 84: Line 84:


== Get unique Tags from Podcast-data ==
== Get unique Tags from Podcast-data ==
<noinclude><div id='devStage'>
<syntaxhighlight lang="typescript" class="code-continue">
import products from "./podcast-data.mjs";
 
function getUniqueTagsForInLoop(data) {
    const unqTagsTrack = {};
    const unqTagsList = [];
 
    data
        .map(({ tags }) => tags)
        .flat().forEach(tag => {
            unqTagsTrack[tag] = true;
        });
 
    for (const key in unqTagsTrack) {
        unqTagsList.push(key);
    }
 
    return unqTagsList;
}
</syntaxhighlight><syntaxhighlight lang="typescript" class="code-continue">
import products from "./podcast-data.mjs";
 
function getUniqueTagsWithFilter(data) {
    const unqTagsTrack = {};
 
    return data
        .map(({ tags }) => tags)
        .flat()
        .filter(tag => {
            if (!unqTagsTrack[tag]) {
                unqTagsTrack[tag] = true;
                return true;
            }
            return false;
        });
}
</syntaxhighlight><noinclude><div id='devStage'>
{{devStage  
{{devStage  
  | Прндл  = JavaScript
  | Прндл  = JavaScript

Revision as of 14:49, 11 March 2023

JavaScript

Ref­er­ences

Ex­am­ple da­ta files

product-data.mjs

export default [
    { product: "#1", type: "sweet",  price: 7.54 },
    { product: "#2", type: "savory", price: 2.55 },
    { product: "#3", type: "savory", price: 3.79 }
];

podcast-data.mjs

export default [
    {
        id: 1,
        title: "Stranger Scrims",
        duration: 40,
        tags: ["supernatural", "horror", "drama"],
    },
    {
        id: 2,
        title: "The Scrim of the Dragon",
        duration: 60,
        tags: ["drama", "fantasy"],
    },
    {
        id: 3,
        title: "Scrim Hunters",
        duration: 22,
        tags: ["reality", "home improvement"],
    }
];

Sort Ob­jects by a Prop­er­ty (Price)

import products from "./product-data.mjs";

function sortProducts(data: { product: string, type: string, price: number }[]) {
    return data.sort((a, b) => a.price - b.price);
}

Re­duce the prices in­to a Sum

import products from "./product-data.mjs";

function sumPrices(data: { product: string, type: string, price: number }[]) {
    return parseFloat(
        data.reduce((acc, { price }) => acc + price, 0)
    ).toFixed(2);
}

Re­duce the prices of cer­tain prod­uct type in­to a Sum

import products from "./product-data.mjs";

function sumPrices(data: { product: string, type: string, price: number }[]) {
    return parseFloat(
        data
            .filter(({ type }) => type === "savory")
            .reduce((acc, { price }) => acc + price, 0)
    ).toFixed(2);
}

Fil­ter the Ob­jects by a Prop­er­ty and Map a new Ar­ray

import products from "./product-data.mjs";

function sumPrices(data: { product: string, type: string, price: number }[]) {
    return data
            .filter(({ type }) => type === "savory")
            .map(({ item, price }) => ({ item, price }));
}

Get unique Tags from Pod­cast-da­ta

import products from "./podcast-data.mjs";

function getUniqueTagsForInLoop(data) {
    const unqTagsTrack = {};
    const unqTagsList = [];

    data
        .map(({ tags }) => tags)
        .flat().forEach(tag => {
            unqTagsTrack[tag] = true;
        });

    for (const key in unqTagsTrack) {
        unqTagsList.push(key);
    }

    return unqTagsList;
}

import products from "./podcast-data.mjs";

function getUniqueTagsWithFilter(data) {
    const unqTagsTrack = {};

    return data
        .map(({ tags }) => tags)
        .flat()
        .filter(tag => {
            if (!unqTagsTrack[tag]) {
                unqTagsTrack[tag] = true;
                return true;
            }
            return false;
        });
}
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