How to remove specific element in array in javascript

If I have array, for example :

a=["a","b","c"]  

I need something like

a.remove("a");

How can I do this?

Answer

var newArray = [];
var a=["a","b","c"];
for(var i=0;i    if(a[i]!=="a") newArray.push(a[i]);

EDIT: as of newer versions of JS:

var a = ["a","b","c"];
var newArray = a.filter(e => e !== "a");