addBorder

addBorder.js

function returnLine(text){
    var line=["*"];
    var letters=text.split("");
    for(var i=0;i<letters.length;i++){
        line.push(letters[i]);
    }
    line.push("*");
    return line.join("");
}

function returnAsterisks(count){
    var asterisks=["*","*"];
    while(count>0){
        asterisks.push("*");
        count--;
    }
    return asterisks.join("");
}

function addBorder(picture) {
    var fenced=[];
    
    fenced.push(returnAsterisks(picture[0].length));
    for(var i=0;i<picture.length;i++){
        fenced.push(returnLine(picture[i]));
    }
    fenced.push(returnAsterisks(picture[0].length));
    return fenced;
}