@tidyjs/tidy/dist/es/slice.js

Tidy up your data with JavaScript, inspired by dplyr and the tidyverse

import { shuffle } from 'd3-array';
import { arrange, desc } from './arrange.js';

function slice(start, end) {
  const _slice = (items) => items.slice(start, end);
  return _slice;
}
const sliceHead = (n) => slice(0, n);
const sliceTail = (n) => slice(-n);
function sliceMin(n, orderBy) {
  const _sliceMin = (items) => arrange(orderBy)(items).slice(0, n);
  return _sliceMin;
}
function sliceMax(n, orderBy) {
  const _sliceMax = (items) => typeof orderBy === "function" ? arrange(orderBy)(items).slice(-n).reverse() : arrange(desc(orderBy))(items).slice(0, n);
  return _sliceMax;
}
function sliceSample(n, options) {
  options = options != null ? options : {};
  const {replace} = options;
  const _sliceSample = (items) => {
    if (!items.length)
      return items.slice();
    if (replace) {
      const sliced = [];
      for (let i = 0; i < n; ++i) {
        sliced.push(items[Math.floor(Math.random() * items.length)]);
      }
      return sliced;
    }
    return shuffle(items.slice()).slice(0, n);
  };
  return _sliceSample;
}

export { slice, sliceHead, sliceMax, sliceMin, sliceSample, sliceTail };
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