Construct array using each index of another array javascript

Question

I need a little help with this as it's making my brain hurt.

Here is a string I have:

var path = "/great-grand-parent/grand-parent/parent/";

And an array from that:

var pathsArray = path.split("/");

After splitting that string on "/" into an array so each level stands on its own, I would like to build another array where each index of pathsArray[] is used to construct an array that would contain full paths of all parents:

0: /great-grand-parent/grand-parent/parent/

1: /great-grand-parent/grand-parent/

2: /great-grand-parent/

3: /

I tried using a for loop to loop backwards through pathsArray[] but then got confused on how to reference each index recursively. Any help would be greatly appreciated! Probably pretty simple.

user1106925 · Accepted Answer · 2015-07-01 18:41:19Z

1

var result = pathsArray.map(function(s, i, arr) {
    return arr.slice(0, arr.length-i).join("/") || "/";
});

var path = "/great-grand-parent/grand-parent/parent/";
var pathsArray = path.split("/");
var result = pathsArray.map(function(s, i, arr) {
    return arr.slice(0, arr.length-i).join("/") || "/";
});
document.body.innerHTML = "<pre>" + JSON.stringify(result, null, 2) + "</pre>";

There's an extra result because of the trailing /. You can trim that away if you want.

answered Jul 1, 2015 at 18:41

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1 Comment

Matt. Over a year ago

This is perfect! Thank you very much for your help. Pretty efficient way to do it.

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