CODEWITHSUNDEEP
javascriptarrays
Matt.
Matt.

Reputation: 1294

Construct array using each index of another array javascript

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.

Upvotes: 0

Views: 13

Answers (1)

user1106925
user1106925

Reputation: 

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.

Upvotes: 1

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