A simple, basic, and robust set of utilities for javascript - inspired by, but not copied from, lodash.
$ npm i -S isdo
const { is } = require('isdo');
let foo;
is.defined(foo); // => false
is.missing(foo); // => true
foo = null;
is.defined(foo) // => true
is.missing(foo) // => true
const arry = [];
is.array(arry); // => true
is.empty(arry); // => true
arry.push(1);
is.empty(arry); // => false
You can add your own useful comparisons and checks by using is.extend.
type comparisons
presence checks
quality checks
truthy/falsey checks
extending with custom methods
presence checks
truthy/falsey checks
presence checks
truthy/falsey checks
is.array(target)Returns
true if target is an array, otherwise false.
is.boolean(target)Returns
true if target is a boolean, otherwise false.
is.float(target)Returns
true if target is a float, otherwise false.
is.function(target)Returns
true if target is a function, otherwise false.
is.integer(target)Returns
true if target is an integer, otherwise false.
is.iterable(target)Returns
true if target conforms to the iterable protocol, otherwise false.
is.map(target)Returns
true if target is a map, otherwise false.
is.number(target)Returns
true if target is a number (integer or float), otherwise false.
is.object(target)Returns
true if target is a plain object, otherwise false.
is.set(target)Returns
true if target is a set, otherwise false.
is.string(target)Returns
true if target is a string, otherwise false.
is.defined(target)Returns
true if target is NOT undefined, otherwise false.
is.missing(target)Returns
true if target is either undefined or null, otherwise false.
is.notNull(target)Returns
true if target is anything other than null, even undefined, otherwise false.
is.present(target)Returns
true if target is both defined and not null, otherwise false.
is.blank(target)Returns
true if target string is missing or has length < 1, otherwise false.
is.empty(target)Returns
true if target's length < 1, otherwise false.
If target is an array or string, length = target.length, if target is a map or set, length = target.size, if target is an object, length = number of keys in target, otherwise length = 0.
is.true(target)Returns
true if target is a string and is one of ["t", "true", "1"], or if target is a number and is > 0, or if target is a boolean and is true, otherwise returns false.
Ignores capitalization.
is.false(target)Returns
true if target is a string and is one of ["f", "false", "0"], or if target is a number and is <= 0, or if target is a boolean and is false, otherwise returns false.
Ignores capitalization.
is.extend(source)Transfers functions and nested functions from source to is.
Example
const moment = require('moment');
const isdo = require('is');
const is = isdo.is.extend({
date: obj => moment.isDate(obj),
});
is.date('foo'); // => false
is.date(new Date()); // => true
is.all.defined(targets)Returns
true if all targets are defined, otherwise false.
is.all.undefined(targets)Returns
true if all targets are undefined, otherwise false.
is.all.present(targets)Returns
true if all targets are neither null nor undefined, otherwise false.
is.all.missing(targets)Returns
true if all targets are null or undefined, otherwise false.
is.all.true(targets)Returns
true if all targets are truthy, otherwise false.
is.all.false(targets)Returns
true if all targets are falsey, otherwise false.
is.any.defined(targets)Returns
true if at least one of targets are defined, otherwise false.
is.any.undefined(targets)Returns
true if at least one of targets are undefined, otherwise false.
is.any.present(targets)Returns
true if at least one of targets are neither null nor undefined, otherwise false.
is.any.missing(targets)Returns
true if at least one of targets are null or undefined, otherwise false.
is.any.true(targets)Returns
true if at least one of targets are truthy, otherwise false.
is.any.false(targets)Returns
true if at least one of targets are falsey, otherwise false.
is module for common comparisons and checks i/e undefined, null, object, etcdo module for common functions i/e merge, get, etcFAQs
Simple, basic, but robust javascript utilities.
We found that isdo demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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