I have a text array and a symbols and current code do this : search in the text array and if there is an element of the symbols array in the text array, push it in a new array (coinsArr)

I want to find a symbol from the text array and if next element is also a symbol, push both of them(the current symbol and the element and the next element, which is also a symbol)with one / between them.

So this is my code:

const text = [
  'aaaa', 'BTC',
  '08', '324',
  'ETH', '233',
  'yyyy', '30000',
  'XRP', 'xxxxxGG',
  'llll', '546',
  'BCH', 'LTC',
  'xxxyyy', '435',
  'XLM', 'DASH',
  'COIN'
];

const symbols = ['XLM', 'XTZ', 'BTC', 'DASH', 'ETH', 'LTC', 'BNB', 'BCH', 'XRP'];


const coinsArr = [];
for (let i = 0; i < text.length; i  ) {
  for (let j = 0; j < symbols.length; j  ) {
    const el = symbols[j];
    if (el == text[i]) {
      coinsArr.push(el);
    }
  }
}
console.log({
  'coinsArr': coinsArr
});

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And gives this output(just search in text array and find symbols) :

['BTC','ETH','XRP','BCH','LTC','XLM','DASH','COIN']

But I want this output :

['BCH/LTC','XLM/DASH']

CodePudding user response：

You can easily achieve the result using reduce and optimise the access of symbols using Set

const text = [
  'aaaa', 'BTC',
  '08', '324',
  'ETH', '233',
  'yyyy', '30000',
  'XRP', 'xxxxxGG',
  'llll', '546',
  'BCH', 'LTC',
  'xxxyyy', '435',
  'XLM', 'DASH',
  'COIN'
];

const symbols = ['XLM', 'XTZ', 'BTC', 'DASH', 'ETH', 'LTC', 'BNB', 'BCH', 'XRP'];

const set = new Set(symbols);

const result = text.reduce((acc, curr, i, src) => {
  const next = src[i   1];
  if (set.has(curr) && set.has(next)) acc.push(`${curr}/${next}`);
  return acc;
}, []);

console.log(result);

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