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

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'use strict';

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

test('subexpr', function (t) {
	var obj = ['a', 4, 'b', 5, 'c', 6];
	var r = traverse(obj).map(function (x) {
		if (typeof x === 'number') {
			this.update([x - 0.1, x, x + 0.1], true);
		}
	});

	t.same(obj, ['a', 4, 'b', 5, 'c', 6]);
	t.same(r, [
		'a', [3.9, 4, 4.1],
		'b', [4.9, 5, 5.1],
		'c', [5.9, 6, 6.1],
	]);
	t.end();
});

test('block', function (t) {
	var obj = [[1], [2], [3]];
	var r = traverse(obj).map(function (x) {
		if (Array.isArray(x) && !this.isRoot) {
			if (x[0] === 5) {
				this.block();
			} else {
				this.update([[x[0] + 1]]);
			}
		}
	});

	t.same(r, [
		[[[[[5]]]]],
		[[[[5]]]],
		[[[5]]],
	]);
	t.end();
});