ES6 Template Tags exampple

es6-template-tags.js

// Template Tag function replaces string references to variable names with eval()'ed variable's value,
// and rpads the value string with spaces so that it takes up exactly the same space that the variable name used to.
// Makes it easier to maintain block column formatting across rows of text.

var apples = 1, bananas = 2, cucumbers = 3,
  result = ((apples) * bananas) - cucumbers;
  
console.log(vpad`((apples) * bananas) - cucumbers = result`);
console.log(vpad`((${'apples'}) * ${'bananas'}) - ${'cucumbers'} = ${'result'}`);  

// output is:
// ((apples) * bananas) - cucumbers = result
// ((1     ) * 2      ) - 3         = -1    

// WARNING: variable name must always be longer than value string or value is truncated.     
var vpad = (a, ...args) => a.map((s,i)=> s + ((null == args[i]) ? '' :
  (eval(args[i]) + args[i].replace(/./g, ' ')).substr(0,args[i].length) )).join('');