is-empty-string

Module to test whether a variable is either undefined, null, or a string that contains only whitespace characters.

Will return false in any case where input is not undefined, null, or a string that contains only whitespace characters, including spaces, tabs, non-breaking spaces, or newline characters.

Installation

Installation is easiest through npm:

npm install is-empty-string --save

Usage

is-empty-string can be easily included and used in two ways, depending on how you would like to use it.

Firstly, directly, as a reference:

var isEmptyString = require('is-empty-string')();

function isUserInputEmpty(userInput) {
    return isEmptyString(userInput);
}

or as a decorator on String.prototype:

require('is-empty-string')({ mode: 'prototype'});


function isUserInputEmpty(userString) {
    return userString.isEmpty();
}   

Full list of options

var direct = require('is-empty-string')(options)

Call to the is-empty-string module function only returns a value if direct is specified as true

Only 2 options are supported at this point:

• direct : true/false,
• prototype : true/false

At least one of direct or prototype must be defined