Extract value from array recursively in javascript

I want to extract the file names in this structure recursively. –

[CODE]var DirectoryTree = {
dir: ‘project1’,
files: [
‘proj.config’, {
dir: ‘src’,
files: [
‘name.htm’,
‘dept.htm’,
‘salary.htm’, {
dir: ‘scripts’,
files: [
‘name.js’,
‘dept.js’,
‘salary.js’
]
}
]
}, {
dir: ‘project2’,
files: [
‘proj.config’, {
dir: ‘src’,
files: [
‘name.htm’,
‘dept.htm’,
‘salary.htm’, {
dir: ‘scripts’,
files: [
‘name.js’,
‘dept.js’,
‘salary.js’
]
}
]
}
]
}
]
};[/CODE]

I wrote the following code and got all the file names. But now I also want to extract the file names that are under a subfolder i.e src. I pass the subfolder name as the second argument. Here is the code now –

[CODE]fileNames : function(fileSystem, subFolder){
var result = [];

(function findFiles(fileSystem){
var files = fileSystem.files;

if(typeof files !== ‘undefined’){
for(var i=0; i<files.length; i++){
if(typeof files[i] === ‘string’) {
result.push(files[i]);
}else{
findFiles(files[i]);
}
}
}
})(fileSystem);

return result;
}[/CODE]

The code now returns all the file names in the directory structure. I want to modify this to support both functionality. It should return all the file names in the structure and when there is a value passed into the subfolder it gives all the files beneath it. So in this case when i pass “SRC” as my subfolder it should return 5 files ‘name.htm’, ‘dept.htm’, ‘salary.htm’, ‘name.htm’, ‘dept.htm’, ‘salary.htm’.

How can i do this?

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