Mapping and Reducing an Array within an Array of Objects in Javascript -


i'd appreciate advice on below. need extract keywords array within array of objects below, , reduce them show keywords without repetition.

my data json object below:

[   {     "word":"cat",     "answer":"a type of feline",     "keywords": ["pet", "mouse-catcher"]   },   {     "word":"dog",     "answer":"a type of canine",     "keywords": ["pet", "cat-catcher"]   }, ]

my js code below:

let keywordlist = data.map(entry => {    let list = [...entry.keywords];     return (       list.reduce(( finalarray, current ) => finalarray.concat(current),[])   ); });

within react component, iterate on array using map again:

<p>   keywords: {keywordlist.map((word, index) => {     return (       <span key={word+index}>         <a onclick={this.searchkeyword} href="#" id={word}>{word}</a>         <span> | </span>       </span>     );    })} </p>

unfortunately, reduce function doesn't seem working, i'm getting array of arrays. advice great.

instead of map, reduce filter:

var list = data.reduce((p, c) => {   return p.concat(c.keywords.filter(el => !p.includes(el))); }, []);

demo


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