regexp inside javascript mapobject

Question

I would like to edit javascript from this post and use regexp inside map, if possible: like string starts with "xyz", but that syntax is not working for me :

var anchorMap = {
    "A": "/products/A",
    "B": "/products/B",
    /^xyz: "/products/xyz"
}

is that possible ? Or what is the easiest way to implement such logic ?

I'm sure this will help you! https://stackoverflow.com/questions/7365027/how-to-use-a-regexp-literal-as-object-key — Kashmir54, Feb 22 '19 at 09:48

score 0 · Answer 1 · answered Feb 22 '19 at 09:48

That's not something I would recommend (and I don't really understand your goal here - however, you could make the regex a string and loop the keys to test against.

var anchorMap = {
    "A": "/products/A",
    "B": "/products/B",
    "^.{3}": "/products/xyz"
};

const k = Object.keys(anchorMap).find(e => new RegExp(e).test("xyz"));
console.log(anchorMap[k]);

score 0 · Answer 2 · answered Feb 22 '19 at 09:50

You can define keys as regex and than using find you can see which regex key it is matching and get the value for that particular key from object.

var anchorMap = {
    "A": "/products/A",
    "B": "/products/B",
    [`^xyz`]: "/products/xyz"
}

let str = 'xyz'

let op = Object.keys(anchorMap).find( e => new RegExp(e).test(str))

console.log(anchorMap[op])

regexp inside javascript mapobject

2 Answers2