map-pickas v0.1.2

map-pickas

NOTE: map-pickas was renamed to @extra-map/pick-as.

Filter map with specified key(s), like _.pick().

const pickAs = require('map-pickas');
// pickAs(<map>, <key(s)>, [begin=0], [end], [target=new Map()])
// -> <value> (for single key) | <target> (for multiple keys)

var m = new Map([['i', 9], ['n', 14], ['c', 3]]);
pickAs(m, 'n');
// 14
pickAs(m, ['n', 'i']);
// Map {'n'=>14, 'i'=>9}
pickAs(m, ['n', 'i', 'c'], 1);
// Map {'i'=>9, 'c'=>3}
pickAs(m, ['n', 'i', 'c'], 1, 2);
// Map {'i'=>9}
pickAs(m, ['n', 'i', 'c'], 1, 2, new Map([['e', 5]]));
// Map {'e'=>5, 'i'=>9}