Array.indexOf()
Get the index of the first matching item in an array. Returns -1 if no matching item is found.
var sandwiches = ['turkey', 'tuna', 'blt', 'pb&jb'];
// returns 1
sandwiches.indexOf('tuna');
// returns -1
sandwiches.indexOf('ham');
Get the index of the first matching item in an array. Returns -1 if no matching item is found.
var sandwiches = ['turkey', 'tuna', 'blt', 'pb&jb'];
// returns 1
sandwiches.indexOf('tuna');
// returns -1
sandwiches.indexOf('ham');