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x/ramda/test/pluck.js

:ram: Practical functional Javascript
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var R = require('../source');var eq = require('./shared/eq');

describe('pluck', function() { var people = [ {name: 'Fred', age: 23}, {name: 'Wilma', age: 21}, {name: 'Pebbles', age: 2} ];
it('returns a function that maps the appropriate property over an array', function() { var nm = R.pluck('name'); eq(typeof nm, 'function'); eq(nm(people), ['Fred', 'Wilma', 'Pebbles']); });
it('behaves as a transducer when given a transducer in list position', function() { var numbers = [{a: 1}, {a: 2}, {a: 3}, {a: 4}]; var transducer = R.compose(R.pluck('a'), R.map(R.add(1)), R.take(2)); eq(R.transduce(transducer, R.flip(R.append), [], numbers), [2, 3]); });
});