eliminar un determinado elemento de la matriz
var colors = ["red","blue","car","green"];
var carIndex = colors.indexOf("car");//get "car" index
//remove car from the colors array
colors.splice(carIndex, 1); // colors = ["red","blue","green"]
javascript retire la llave
// Example 1
var key = "Cow";
delete thisIsObject[key];
// Example 2
delete thisIsObject["Cow"];
// Example 3
delete thisIsObject.Cow;
cómo eliminar un elemento de una matriz
var array = [123, "yee", true];
array.pop(index);
unset clave del array js
delete foo[key];