Flatten and Push the elements to given array

README.MD

Description

Function that Flattens and Push elements to given array

Demo

http://www.es6fiddle.net/iu9ftkpx/

flattenAndPush.js

/**
 * Push elements to given array.
 * If any provided element is array, flattens them before pushing.
 * How it works:
 * flattenAndPush([], [1, 2, 3], 4, 5)
 * -> flattenAndPush(flattenAndPush([], 1, 2, 3), 4, 5)
 * -> flattenAndPush([1, 2, 3], 4, 5)
 * -> [1, 2, 3, 4, 5]
 *
 * @param {Array} array Array to push elements
 * @param elements It collects all remaining parameters in array.
 * @return {Array} Returns array with elements pushed to original array.
 */
function flattenAndPush(array, ...elements) {
  return elements.reduce((curr, next) => {
    if(next instanceof Array) return flattenAndPush(curr, ...next);
    else {
      curr.push(next);
      return curr;
    }
  }, array);
}

const testArray = [[1,2,[3, [2, 'abc']]],4];
console.log(JSON.stringify(flattenAndPush([], ...testArray)));