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traverse and transform objects by visiting every node on a recursive walk

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'use strict';

var test = require('tape');
var traverse = require('../');

test('stop', function (t) {
	var visits = 0;
	traverse('abcdefghij'.split('')).forEach(function (node) {
		if (typeof node === 'string') {
			visits += 1;
			if (node === 'e') { this.stop(); }
		}
	});

	t.equal(visits, 5);
	t.end();
});

test('stopMap', function (t) {
	var s = traverse('abcdefghij'.split('')).map(function (node) {
		if (typeof node === 'string') {
			if (node === 'e') { this.stop(); }
			return node.toUpperCase();
		}
		return void undefined;
	}).join('');

	t.equal(s, 'ABCDEfghij');
	t.end();
});

test('stopReduce', function (t) {
	var obj = {
		a: [4, 5],
		b: [6, [7, 8, 9]],
	};
	var xs = traverse(obj).reduce(function (acc, node) {
		if (this.isLeaf) {
			if (node === 7) { this.stop(); } else { acc.push(node); }
		}
		return acc;
	}, []);

	t.same(xs, [4, 5, 6]);
	t.end();
});