Pluck values of a collection given a 'dot' separated string
module.exports = function pluckDeep(coll, selector) { ... }npm i -S pluck-deep
pluckDeep accepts an array or object as an initial argument.
You can pick a value or array of values by passing in a selector.
For the purpose of pluckDeep a selector is a string with object
value accessors separated with a .. In other words, you can retrieve
a value just like you would on any object, except that these selectors
will automatically map an array of values for you.
// Example selectors
'planet.earth.size'; // returns a single value set a size
'planet.saturn.moons.name'; // Will return an array of moon namesSee below examples and tests for more selectors
var sel = 'mercury.venus';
var o = {
mercury: {
venus: 'earth'
}
};
var v = pluckDeep(o, sel);
assert.equal(v, o.mercury.venus);var sel = 'saturn.moons.name';
var o = {
saturn: {
moons: [{ name: 'titan' }, { name: 'enceladus' }, { name: 'rhea' }]
}
};
var arr = pluckDeep(o, sel);
var expect = o.saturn.moons.map(prop('name'));
assert.deepEqual(arr, expect);Add a filterable statment to filter out return values based on some comparable
var sel = 'system.planets.name[type=dwarf]';
var o = {
system: {
planets: [
{
name: 'earth',
type: 'ocean'
},
{
name: 'pluto',
type: 'dwarf'
}
]
}
};
var v = pluckDeep(o, sel);
assert(Array.isArray(v));
assert.equal(v.length, 1);
assert.equal(v[0], 'pluto');
// With an object
var sel = 'rings[type=gas]';
var venus = {
type: 'gas',
rings: false
};
var v = pluckDeep(venus, sel);
assert.equal(v, false);
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