toPairs
Creates an array of key-value pair arrays from an object or other iterable.
- Check if
Symbol.iterator
is defined and, if so, use Array.prototype.entries()
to get an iterator for the given iterable.
- Use
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']]