get all combinations for a string

Question

I\'m trying to create a function in JavaScript that given a string will return an array of all possible combinations of the letters with each used at most once, starting wit

Answer 1

This is usiing loop as you expected easiest way.. good luck

        function mixString() {
            var inputy = document.getElementById("mixValue").value
            var result = document.getElementById("mix-result")
            result.innerHTML=""

            
            for (var i = 0 ; i < inputy.length; i++) {
               
                for (var b = 0 ; b < inputy.length; b++) {
                    
                    if (i == b) {
                        
                        result.innerHTML += inputy.charAt(i) + ","
                    }
                    else
                    {
                        result.innerHTML += inputy.charAt(i) + inputy.charAt(b) + ","
                    }
                    
                }

            }
        }

    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    
    <div class="container">
        <div class="panel panel-default">
            <div class="panel-heading">JavaScript string combination
</div>
            <div class="panel-body">
                <input id="mixValue" class="form-control" />
                <input type="button" onclick="mixString()" value="click" />
                <div id="mix-result"></div>
            </div>
        </div>
    </div>

Answer 2

The accepted solution as of July 29, 2019 allows for duplicate strings to be returned in the array. The following adjustment fixes that little issue by adding a condition to the push.

            // however, we don't want duplicates so...
            if (!result.includes(next)) {
                result.push(next);    
            }