get bigrams

bigram.ts

// see: http://norvig.com/mayzner.html

all = [...document.querySelectorAll('tbody td')]
  .filter((td) => td.title.includes(": "))
  .map((td) => {
    const [bi, val] = td.title
    	.split('%')[0]
      .split(': ')
    return [bi.toLowerCase(), Number(val)]
  })
  .filter(([bi]) => !/(.)\1/.test(bi))
  .sort(([, a], [, b]) => a > b ? -1 : 1)

allR = Object.entries(all.reduce((z, [bi, valToAdd]) => {
    const [left, right] = bi.split('')
    const triLR = [right + bi, bi + left]
    const [triL, triR] = triLR
    const tri = triLR.every((triX) => z[triX] === undefined)
      ? triL
      : (z[triL] !== undefined ? triL : triR)

    return {
      ...z,
      [tri]: (z[tri] || 0 ) + valToAdd,
    }
  }, {}))
  .sort(([, a], [, b]) => a > b ? -1 : 1)