连接两个（或更多）字符串并生成相同的字符串，无论顺序如何

Question

I want to concatenate some strings into single string. (ex: "Pen" and "Apple" -> "PenApple") But, I want the outputting string to be the same regardless of the order they're concatenated in.

Each string contain non-Unicode characters.

If the implementation of newConcat("Pen", "Apple") outputs "PenApple" then newConcat("Pen", "Apple") === newConcat("", "PenApple")

and likewise, newConcat("Pen", "Apple") === newConcat("", "ApplePen") then newConcat("Pen", "Apple") must output "ApplePen"

In general, these test cases needs to be true as well:

newConcat("Pen", "Apple") === newConcat("Apple", "Pen"); // true
newConcat("Pen", "Apple") === newConcat("_P3n", "_App13"); // false

newConcat("Pen", "Pineapple", "Apple", "Pen") === newConcat("Apple", "Pen", "Pen", "Pineapple"); // true

What I've come up with so far, is to put the strings in an array, sort it, then return it joined as string.

function newConcat( ...strings ) {
    const newArray = []
    newArray.push(...strings)
    return newArray.sort().join("") 
}

I want to know if there's a better way to do this than to sort the strings inside an array. What if I want to control what order they should be put together.

Answer 1

I would pass the results as an array and order it before returning like this.

I hope this helps!

 function newConcat(array) { array.sort(); var concat = ""; for (var i=0; i<array.length;i++){ concat = concat +array[i] } return concat } console.log(newConcat(["Pen","Apple"])); console.log(newConcat(["Pen","Apple"])===newConcat(["Pen","Apple"])); console.log(newConcat(["Pen","Apple"])===newConcat(["_P3n","_App13"])); console.log(newConcat(["Pen", "Pineapple", "Apple", "Pen"])===newConcat(["Apple", "Pen", "Pen", "Pineapple"]));