How to append a custom string before element of array using JS join()

Question

How can I append/concatenate some string before each array element using join()? For example the following code has an output like

One_Two_Three_Four

but what I want is adding the string Step- to the beginning of all items on join which can have an output like:

Step-One_Step-Two_Step-Three_Step-Four

var steps = ["One", "Two", "Three", "Four"];
var stpstr = steps.join("_");

console.log(stpstr);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

join with _Step- and also add a _Step- in the beginning ? — thesamiroli
– thesamiroli, Commented Dec 12, 2020 at 7:31
Hi the join with _step- is adding the string _step- to the end of each element but as I asked I want to add to the beginning of each phrase — Behseini
– Behseini, Commented Dec 12, 2020 at 7:38

ujjaldey · Accepted Answer · 2020-12-12 07:38:23Z

4

This should work:

steps.map(e => "Step-" + e).join("_")

answered Dec 12, 2020 at 7:38

ujjaldey

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