TezosAddressesExtractAndRaffle.js

/*
Javscript snippet inteded to make it a bit easier to obtain list of tezos addresses
in Twitter comments, usually for Reserve Lists in fxhash and other marketplaces. 
Also includes function to run random raffle.

How to use:
Just open the twitter page listing all the RL requests, zoom out + scroll to get full list, then open
devTool's console and run the script to get the functions declared. Then call the main function as needed, i.e:
raffle( getTezosAddresses(), 50 );
*/

function removeDuplicates( array ){
    let uniqueDict = {};
    let uniqueList = [];
    array.forEach( (item)=>{
        if( uniqueDict[item] == null ){
            uniqueDict[item] = true;
            uniqueList.push( item );
        }
    } );
    return uniqueList;
}

function getTezosAddresses(){
    // Get the page's text
    let body = document.body;
    let textContent = body.innerText;
    
    // Find all tezos addresses
    let extractorExpression = /((?<=\s)tz\w+)|(\w+\.tez)/g;
    let results = [...textContent.matchAll(extractorExpression)]
    results = results.map( (item)=>{return item[0];} );
    
    // Remove duplicates
    console.log( "# of tezos addresses found: ", results.length );
    results = removeDuplicates(results);
    console.log( "# of UNIQUE tezos addresses found: ", results.length );

    return results;
}

function raffle( list, numWinners ){
    list = [...list]; // Make a copy of the array so we can modify it without affecting the source one
    let lucky = [];
    for (let i = 0; i < Math.min(list.length, numWinners); i++) {
        const element = list.splice( Math.floor(Math.random()*list.length), 1 );
        lucky.push( element );    
    }
    console.log( `Selected ${lucky.length} lucky ones` )
    console.log( lucky.join('\n') );
    return lucky;
}