right-indexof

return the index of an item in an array starting from the right side

example

var rindex = require('right-indexof');
var xs = [ 'a', 'y', 'b', 'x', 'a', 'y' ];
console.log('rindex("a") = ', rindex(xs, 'a'));
console.log('rindex("b") = ', rindex(xs, 'b'));
console.log('rindex("x") = ', rindex(xs, 'x'));
console.log('rindex("y") = ', rindex(xs, 'y'));
console.log('rindex("z") = ', rindex(xs, 'z'));

output:

rindex("a") =  4
rindex("b") =  2
rindex("x") =  3
rindex("y") =  5
rindex("z") =  -1

methods

var rindex = require('right-indexof')

var ix = rindex(xs, x)

Return the index ix of the element x in the array xs starting from the right-hand side (starting at xs.length-1), returning the first element that is strictly equal (===) to the item x.

If x is not found in xs, return -1.

install

With npm do:

npm install right-indexof

license

MIT