title: How to show variable value in a dynamic constant in Swift?
body: <p>I know my question title is confusing but i'll make my explanation clear. After reading my question please suggest a good title so that it will be helpful to others.</p>
  
  <p>I have a label whose text is determined by JSON from API.</p>
  
  <pre><code>text_from_json =  "My name is _ and my age is _"
  mylabel.text = text_from_json
  </code></pre>
  
  <p>I have my age as "26" and name as "jack" in two constants within class.</p>
  
  <pre><code>let age = 26
  let name = "jack"
  print("mylabel.text")
  //my output should be "My name is Jack and my age is 26"
  </code></pre>
  
  <p>I'm looking for function/method in Swift similar to Python:</p>
  
  <pre><code>text_from_json = "My name is {0} and my age is {1}"
  
  print("My name is {0} and my age is {1}".format(name, age))
  </code></pre>
  
  <p>Do we have any function in Swift similar to <code>.format</code> in Python?</p>