if("foobar".indexOf("foo") > -1) 

if(~"foobar".indexOf("foo"))

var foo = Math.floor(2.333)

var foo = ~~2.333

var foo = parseFloat("12.4")
var bar = parseInt("12", 10)

var foo = +"12.4"
var bar = +"12"

if(isNaN(foo))

if(foo != foo)

(function(){ ... })()

!function(){ ... }()

var isFoo = !!foo

function foo(){
    console.log("foo here");
}

// called with the name of the function
foo();

var x = function (a, b) {return a * b};

// called using the vairable name
x(4,5);//20

const abc = {
  salute: "",
  greet: function() {
    this.salute = "Hello";
    console.log(this.salute); //Hello
    const setFrench = function(newSalute) {
      this.salute = newSalute;
    };
    setFrench("Bonjour");
    console.log(this.salute); //Bonjour
  }
};

setTimeout(abc.greet.bind(abc));        // setTimeout + bind
setTimeout(()=> abc.greet.call(abc));   // setTimeout + call 
setTimeout(()=> abc.greet.apply(abc));  // setTimeout + apply

setInterval(abc.greet.bind(abc));        // setInterval + bind 
setInterval(()=> abc.greet.call(abc));   // setInterval + call 
setInterval(()=> abc.greet.apply(abc));  // setInterval + apply

(abc.greet)();                          // function wrap (only)
(abc.greet.bind(abc))();                // bind  + function wrap
(() => abc.greet.call(abc))();          // call  + function wrap
(() => abc.greet.apply(abc))();         // apply + function wrap

$(document).ready(function(){})

$(function(){})