Removing an element from an array specifying a value in Javascript

Question

I have read this question:

Deleting array elements in JavaScript - delete vs splice

And it appears that both splice and delete require an index of the elemen

Answer 1

var array = ["test1", "test2", "test3"];
array.splice(array.indexOf("test2"), 1);

indexOf (source):
Returns the first index at which a given element can be found in the array, or -1 if it is not present.