toPairs.md

title	tags
toPairs	object,array,intermediate

Creates an array of key-value pair arrays from an object or other iterable (object, array, string, set etc.).

• Check if Symbol.iterator is defined and, if so, use Array.prototype.entries() to get an iterator for the given iterable, Array.from() to convert the result to an array of key-value pair arrays.
• If Symbol.iterator is not defined for obj, use Object.entries() instead.

const toPairs = obj =>
  obj[Symbol.iterator] instanceof Function && obj.entries instanceof Function
    ? Array.from(obj.entries())
    : Object.entries(obj);

toPairs({ a: 1, b: 2 }); // [ ['a', 1], ['b', 2] ]
toPairs([2, 4, 8]); // [ [0, 2], [1, 4], [2, 8] ]
toPairs('shy'); // [ ['0', 's'], ['1', 'h'], ['2', 'y'] ]
toPairs(new Set(['a', 'b', 'c', 'a'])); // [ ['a', 'a'], ['b', 'b'], ['c', 'c'] ]