JS: Filter array only for non-empty and type of string values

Question

I am trying to filter an array like this:

array.filter(e => { return e })

With this I want to filter all empty strings including undef

Answer 1

You could check for a string and empty both in your filter method:

array.filter(e => (typeof e === 'string') && !!e)

Note: !!e returns false if the element is null, undefined, '' or 0.

I should mention that the "arrow"-function syntax only works in browsers that support ES6 or higher.

The alternative is:

array.filter(function(e) {
    return (typeof e === 'string') && !!e;
});

Note: Keep in mind that Array.prototype.filter doesn't exist in older browsers.