javascript braces, brackets and curlies

braces brackets and curlies.md

From stack:

https://stackoverflow.com/questions/23225375/when-to-use-parentheses-brackets-and-curly-braces-in-javascript-and-jquery

Unfortunately, the best answer is "use them each as appropriate where necessary".

Parenthesis () in JavaScript are used for function calls, to surround conditional statements, or for grouping to enforce Order of Operations.

function myFunc() {
  if (condition1) {

  }
  if ( (1 + 2) * 3) {
    // very different from (1 + 2 * 3)
  }
}

Braces {} are used during the declaration of Object Literals, or to enclose blocks of code (function definitions, conditional blocks, loops, etc).

var objLit = {
  a: "I am an Object Literal."
};

Brackets [] are typically mostly used for accessing the properties of an Object (or the elements of an Array), so mylist[3] fetches the fourth element in the Array.

var mylist = [1,2,3,4];
alert(mylist[2]);```