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I want to have a user inputted string like "hello world". then take the string and turn it into an array with each letter being a part of the array. then i want to change to the values of the array. then i want to take the array and combine all the parts of the array into a string then output it. so the out put would look like "gwkki qieks" note the replacement values are coming from another array.

As mentioned in my comment you can use .split("") to convert your string into an array of characters. You can then use .join("") to convert that back into a string after making any modifications.

For this method I'd recommend using a object as it will act like a hash map, that way you don't need to iterate though all your replacement characters each time:

var str = "hello world"; // Original String 

var map = // Used for char replacement
 'h': 'g',
 'e': 'w',
 'l': 'k',
 'o': 'i',
 'w': 'q',
 'r': 'e',
 'd': 's'
;
 
var arr = str.split(""); // Convert to array of chars

for(var i=0; i<arr.length; i++) // For each char in our array
 if(arr[i] in map) // If the char in our map 
 arr[i] = map[arr[i]]; // Then replace it
 


console.log(arr.join("")); // Join combines all chars to string

Edit:

As @noahnu pointed out you can do this using map. Instead of a standard for loop you can use:

str.split("").map(c => map[c] || c).join("");

Or in ES5:

str.split("").map(function(c)).join(""));

This will make the current character being iterated to be the value map[c], if it is undefined that will evaluate to false and it will then use c instead.

Looks like you're doing this – https://www.mehtanirav.com/qwerty-werty/

The letters in a string are mapped to the corresponding keyboard keys and shifted so that Q becomes P, W becomes Q and so on. By storing all of the shifts in a dictionary, we can iterate through the characters of the string and append the corresponding mapped letter to the new string.

const keyboard = 
 q:'p',w:'q',e:'w',r:'e',t:'r',y:'t',u:'y',i:'u',o:'i',p:'o',
 a:'l',s:'a',d:'s',f:'d',g:'f',h:'g',j:'h',k:'j',l:'k',
 z:'m',x:'z',c:'x',v:'c',b:'v',n:'b',m:'n',
 Q:'P',W:'Q',E:'W',R:'E',T:'R',Y:'T',U:'Y',I:'U',O:'I',P:'O',
 A:'L',S:'A',D:'S',F:'D',G:'F',H:'G',J:'H',K:'J',L:'K',
 Z:'M',X:'Z',C:'X',V:'C',B:'V',N:'B',M:'N'


function qwertyWerty(str) 
 let newStr = '';
 for(const char of str) char
 
 return newStr;


console.log(qwertyWerty("hello world"));
console.log(qwertyWerty("Hello World"));

It's pretty simple to do this.

1. Create a mapping of your letters to your intended keys. For example, h to g, e to w and so on.


2. Now use the .split to create an array of characters form the string.


3. Now use the ARRAY.map(KEY => VALUE) to create a new array with the new new values of the corresponding characters.


4. Now use the ARRAY.join("") to convert the list to a string.

Here is the code snippet. Hope this helps.

var string = "hello world"; // initial String 

var dictionary = 'h': 'g', 'e': 'w', 'l': 'k', 'o': 'i', 'w': 'q', 'r': 'e', 'd': 's';
 
var old_array = string.split(""); // you'll get an array of characters
var new_array = old_array.map(c => dictionary[c] || c);

var new_string = new_array.join("");
console.log(new_string); // Join combines all chars to string