Array Methods List

array_methods_list.js

// what do i want from this method?
// mutate an array, create a new array
// array includes
// array transform

// methods that MUTATE original array
// + add to original:  .push, ,.unshift (start)
// - remove from original: .pop (end), .shift, .splice
//   others: .reverse, .sort, .fill

// methods that create NEW ARRAY
// .map loop array 
// .filter 
// .slice (portion of original)
// .concat (add to original)
// .flat (flattening original)
// .flatMap 

// An array index
// based on value .indexOf
// based on test condition .findIndex
// array element .find

// know if array includes
// .includes
// .some
// .every

// new string
// .join

// transform to value
// .reduce

// loop array
// .forEach // do some work, not produce new value