[javascript] Calculate the date yesterday in JavaScript

// a (not very efficient) oneliner
let yesterday = new Date(new Date().setDate(new Date().getDate()-1));
console.log(yesterday);

// a function call
yesterday = ( function(){this.setDate(this.getDate()-1); return this} )
            .call(new Date);
console.log(yesterday);

// an iife (immediately invoked function expression)
yesterday = function(d){ d.setDate(d.getDate()-1); return d}(new Date);
console.log(yesterday);

// oneliner using es6 arrow function
yesterday = ( d => new Date(d.setDate(d.getDate()-1)) )(new Date);
console.log(yesterday);

// use a method
const getYesterday = (dateOnly = false) => {
  let d = new Date();
  d.setDate(d.getDate() - 1);
  return dateOnly ? new Date(d.toDateString()) : d;
};
console.log(getYesterday());
console.log(getYesterday(true));

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