// concat
(() => {
  const x = [ 1, 2, 3 ];
  const y = [ 4, 5, 6 ];
  const o = x.concat(y);
  console.log(`concat: ${o}`);
})();

// every
(() => {
  const x = [ 1, 2, 3 ];
  const o = x.every((v) => v < 5);
  console.log(`every: ${o}`);
})();

// some
(() => {
  const x = [ 1, 2, 3 ];
  const o = x.some((v) => v <= 1);
  console.log(`some: ${o}`);
})();

// filter
(() => {
  const x = [ 1, 2, 5, 7 ];
  const o = x.filter((v) => v > 4);
  console.log(`filter: ${o}`);
})();

// map
(() => {
  const x = [ 1, 2, 3 ];
  const o = x.map((v) => v * v);
  console.log(`map: ${o}`);
})();

// foreach
(() => {
  const data = { entry: [ 'e1', 'e2', 'e3' ] };
  const x = [ 1, 2, 3 ];

  let o = '';
  x.forEach(function (v, i) {
    o += `${i}-${v} ${this.entry[i]} `;
  }, data);

  console.log(`forEach: ${o}`);
})();

// indexOf
(() => {
  const x = [ 1, 2, 3 ];
  const o1 = x.indexOf(2);
  const o2 = x.indexOf(5);
  console.log(`indexOf: ${o1}, ${o2}`);
})();

// lastIndexOf
(() => {
  const x = [ 1, 2, 3, 2 ];
  const o1 = x.lastIndexOf(2);
  const o2 = x.lastIndexOf(5);
  console.log(`lastIndexOf: ${o1}, ${o2}`);
})();

// join
(() => {
  const x = [ 1, 2, 3 ];
  const o = x.join('-')
  console.log(`join: ${o}`);
})();

// push/pop
(() => {
  const x = [ 1, 2, 3 ];
  const len1 = x.push(5);
  const out1 = [...x];
  const el   = x.pop();
  const len2 = x.length;
  const out2 = [...x];
  console.log(`push/pop: ${len1}#${out1} | ${el} | ${len2}#${out2}`);
})();

// unshift/shift
(() => {
  const x = [ 1, 2, 3 ];
  const len1 = x.unshift(5);
  const out1 = Array.from(x);
  const el   = x.shift();
  const len2 = x.length;
  const out2 = x.slice();
  console.log(`unshift/shift: ${len1}#${out1} | ${el} | ${len2}#${out2}`);
})();

// reduce
// reduceRight

// reverse
(() => {
  const x = [ 1, 2, 3 ];
  const o = x.reverse();
  console.log(`reverse: ${o}`);
})();

// sort
(() => {
  // NOTE: in place sort
  const x = [ 7, 1, 2, 3 ];
  const out1 = Array.from(x.sort());
  const out2 = Array.from(x.sort((a, b) => b - a));
  console.log(`sort: ${out1} | ${out2}`);
})();

// slice
// splice

// toString
(() => {
  // NOTE: in place sort
  const x = [ 7, 1, 2, 3 ];
  const o = x.toString();
  console.log(`toString: |${o}|`);
})();

// find
// findIndex
// entries
// from
// keys

// [].copyWithin
// [].fill
// [].includes
// [].values