How do you map-replace characters in Javascript similar to the 'tr' function in Perl?

Question

I\'ve been trying to figure out how to map a set of characters in a string to another set similar to the tr function in Perl.

I found this site that sh

Answer 1

Method:

String.prototype.mapReplace = function(map) {
    var regex = [];
    for(var key in map)
        regex.push(key.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&"));
    return this.replace(new RegExp(regex.join('|'),"g"),function(word){
        return map[word];
    });
};

A perfect example:

var s = "I think Peak rocks!"
s.mapReplace({"I think":"Actually","rocks":"sucks"})
// console: "Actually Peak sucks!"

Answer 2

This functions, which are similar how it's built in Perl.

function s(a, b){ $_ = $_.replace(a, b); }
function tr(a, b){ [...a].map((c, i) => s(new RegExp(c, "g"), b[i])); }

$_ = "Εμπεδοκλης ο Ακραγαντινος";

tr("ΑΒΓΔΕΖΗΘΙΚΛΜΝΟΠΡΣΤΥΦΧΩ", "ABGDEZITIKLMNOPRSTIFHO");
tr("αβγδεζηθικλμνοπρστυφχω", "abgdezitiklmnoprstifho");
s(/Ξ/g, "X"); s(/Ψ/g, "Ps");
s(/ξ/g, "x"); s(/ψ/g, "Ps");
s(/ς/g, "s");

console.log($_);

Answer 3

There isn't a built-in equivalent, but you can get close to one with replace:

data = data.replace(/[\-_]/g, function (m) {
    return {
        '-': '+',
        '_': '/'
    }[m];
});