map-pick v0.1.3

map-pick

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

Filter map with specified keys, like _.pick().

const pick = require('map-pick');
// pick(<map>, <keys>, [begin=0], [end], [target=new Map()])
// -> <target>

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