Accessing different elements in a javascript array

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?

It's not correct to use the in operator in this situation. in checks whether an object has a certain property name. — Felix Kling
– Felix Kling, Commented Dec 3, 2013 at 16:03

David Neale · Accepted Answer · 2013-12-03 16:09:09Z

3

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
    }
}

edited Dec 3, 2013 at 16:09

answered Dec 3, 2013 at 15:59

David Neale

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2 Comments

user2811419 Over a year ago

then do i need to nest an if statement within this as if(-1) then continue?

Felix Kling Over a year ago

@user2811419: No. The condition of the if statement evaluates to true if the element is not in the array.

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