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These are so called functions on the fly or anonymous functions, they are loaded at execution time

Syntax

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

Executing a function expression

Sample

Arrays are collections of data.

Syntax

var passengers = ["Andres", "Paula","Carmenza","Jose"];
passengers[0];  // "Andres"
passengers[2] = "Carmencita";  // ["Andres", "Paula","Carmencita","Jose"]

pop()

This function will take out the last element of the array, continue with our array "passengers" we can do the next :