访问JavaScript数组中的不同元素

Question

I have names in an ignore list file called Ignore.json

[
"George",
"Carl"
]

The file is called ignore.json

In my program I am reading the file into the ignore variable

var ignore;

ignore = require("./Ignore.json");

Now I want to see if my array element is not in that list then if it is not in that list output the code.

I know how to check if an element is in an array like:

for (list in lists) {

        if(lists[list].to.toLowerCase() in ignore){

But if I want to check that it is not "in" the list, what is the opposite of in in javascript?

Answer 1

var list, i;
for(i=0;i<lists.length;i++){
    list = lists[i];
    if(ignore.indexOf(lists[list].to.toLowerCase()) === -1){
        // -1 indicates item was not in list
    }
}