merle

poor man's traverse, except merle includes inherited members.

examples

var merle = require('merle');

merle(someObject, function(){

	console.log(this.name); 
	console.log(this.value);
	console.log(this.depth);
	console.log(this.path); // the array of property names that got us to this node.
	console.log(this.isLeaf);
	console.log(this.isRoot);
	console.log(this.isOwn);
	
	this.value = 'this replaces the current node';
	
	return false; // return an explicit false is equivalent to calling this.stop(); 

  // this.stop() will stop walking the current path, this.stop(true) will stop completely
});

transform negative numbers in-place

var merle = require('merle');
var obj = [ 5, 6, -3, [ 7, 8, -2, 1 ], { f : 10, g : -13 } ];

merle(obj, function () {
    if (this.value < 0) this.value += 128;
});

console.dir(obj);

Output:

[ 5, 6, 125, [ 7, 8, 126, 1 ], { f: 10, g: 115 } ]

delete negative numbers in-place

var merle = require('merle');
var obj = [ 5, 6, -3, [ 7, 8, -2, 1 ], { f : 10, g : -13 } ];

merle(obj, function () {
    if (this.value < 0) delete this.value;
});

console.dir(obj);

Output:

[ 5, 6, [ 7, 8, 1 ], { f: 10 } ]

collect leaf nodes

var m = require('merle');
var obj = {
    a : [1,2,3],
    b : 4,
    c : [5,6],
    d : { e : [7,8], f : 9 },
};

var leaves = [];
m(obj, function () {
    if (this.isLeaf) leaves.push(this.value);
});

console.dir(leaves);

Output:

[ 1, 2, 3, 4, 5, 6, 7, 8, 9 ]