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function CheckStrMutation(str1,str2) {
  
  var arr = [str1,str2];
  var mutationBool = true;
  
  for(var i = 0; i < arr[1].length; i++)
  {
    if(arr[0].toLowerCase().indexOf(arr[1].slice(i,i+1).toLowerCase()) === -1)
    {
      mutationBool = false;

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function excludeNullsFromArray(arr) {
  function isTruthy(arg){
    //typecast elements to bool. array.filter iterates, so 'true' elements will
    //  be included in final return.
    return Boolean(arg);
  }
  
  return(arr.filter(isTruthy));
}

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function removeElementsFromArray(arr) {
  //removeElementsFromArray(array,a,b,c,..)
  var args = Array.prototype.slice.call(arguments);
  args.splice(0, 1);
  return arr.filter(function(element) {
    return args.indexOf(element) === -1;
  });
}

removeElementsFromArray([1, 2, 3, 1, 2, 3], 2, 3);

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function indexOfElement(arr, num) {
  
  arr.push(num);
  arr.sort(function(a,b){return a-b;});
  
  return(arr.indexOf(num));
}

indexOfElement([5, 3, 20, 3], 5);

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sudo port install iTerm2 zsh

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(MacPorts Zsh Post Installation Notes)
zsh has the following notes:
 To set MacPorts' zsh as default login shell, run:
 
 sudo chpass -s '/opt/local/bin/zsh' $USER
 
 To be able to switch default shells to or from zsh without superuser privileges, add it to
 /etc/shells:
 
 sudo sh -c 'echo /opt/local/bin/zsh >>/etc/shells'

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$ which zsh
/bin/zsh
$ zsh --version
zsh 5.2 (x86_64-apple-darwin16.0)

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$ port contents zsh | grep bin
 /opt/local/bin/zsh
 /opt/local/bin/zsh-5.3.1
 /opt/local/share/zsh/5.3.1/functions/_bind_addresses
 /opt/local/share/zsh/5.3.1/functions/_bindkey
 /opt/local/share/zsh/5.3.1/functions/_combination
 /opt/local/share/zsh/5.3.1/help/bindkey
$ /opt/local/bin/zsh --version
zsh 5.3.1 (x86_64-apple-darwin16.4.0)

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/opt/local/bin/zsh

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$ cat /etc/shells
# List of acceptable shells for chpass(1).
# Ftpd will not allow users to connect who are not using
# one of these shells.
/bin/bash
/bin/csh
/bin/ksh
/bin/sh
/bin/tcsh
/bin/zsh