appcd-util

Common utility functions.

Visit https://github.com/appcelerator/appc-daemon for more information.

Report issues to GitHub issues. Official issue tracker in JIRA.

Installation

npm i appcd-util

Usage

import { arch } from 'appcd-util';

console.log(arch()); // 'x86' or 'x64'

import { arrayify } from 'appcd-util';

console.log(arrayify('foo')); // [ 'foo' ]

console.log(arrayify([ 'a', '', null, 'b' ], true)); // [ 'a', 'b' ]

import { assertNodeEngineVersion } from 'appcd-util';

// throw an exception if current node version doesn't satisfy the `engines.node` version
assertNodeEngineVersion(require('package.json'));

import { cache } from 'appcd-util';

const now = () => Date.now();

const first = await cache('my namespace', now);
const second = await cache('my namespace', now);
assert(first === second);

const third = await cache('my namespace', true, now);
assert(first !== third && second !== third);

import { cacheSync } from 'appcd-util';

const now = () => Date.now();

const first = cacheSync('my namespace', now);
const second = cacheSync('my namespace', now);
assert(first === second);

const third = cacheSync('my namespace', true, now);
assert(first !== third && second !== third);

Debouncer that returns a promise and that can be cancelled.

import { debounce } from 'appcd-util';

const fn = debounce(() => {
    console.log(new Date());
});

// schedule the callback to be called in 200ms
fn().then(() => {
    console.log('Function called');
});

// cancel the debounce
fn.cancel();

import { formatNumber } from 'appcd-util';

console.log(formatNumber(12)); // 12
console.log(formatNumber(123)); // 123
console.log(formatNumber(1234)); // 1,234
console.log(formatNumber(12345)); // 12,345
console.log(formatNumber(123456)); // 123,456
console.log(formatNumber(1234567)); // 1,234,567

import { get } from 'appcd-util';

const obj = {
    foo: 'bar'
};

console.log(get(obj, 'foo')); // 'bar'
console.log(get(obj, 'baz', 'pow')); // 'pow'

Get all open sockets, [net] servers, timers, child processes, filesystem watchers, and other handles.

import { getActiveHandles } from 'appcd-util';

console.log(getActiveHandles());

import { inherits } from 'appcd-util';

class A {}
class B extends A {}
class C {}

console.log(inherits(B, A)); // true
console.log(inherits(B, C)); // false

import { mergeDeep } from 'appcd-util';

const obj1 = {
    a: {
        b: 'c'
    }
};

const obj2 = {
    a: {
        d: 'e'
    }
};

console.log(mergeDeep(obj1, obj2)); // { a: { b: 'c', d: 'e' } }

import { mutex } from 'appcd-util';

const fn = () => {
    return mutex('my mutex', () => {
        console.log('foo!');
    });
};

await Promise.all([ fn(), fn(), fn() ]);

import { randomBytes } from 'appcd-util';

console.log(randomBytes(20));

import { sha1 } from 'appcd-util';

console.log(sha1('foo'));

import { sleep } from 'appcd-util';

await sleep(1000); // sleep for 1 second

Block multiple simultaneous callers until the first caller finishes, then all queued up 'tailgaters' are resolved with the result.

import { tailgate } from 'appcd-util';

const fn = () => {
    return tailgate('my tailgate', async () => {
        console.log('I will only be called once');
    });
};

await Promise.all([ fn(), fn(), fn() ]);

import { unique } from 'appcd-util';

console.log(unique([ 'a', 'b', 'a', 'b' ])); // [ 'a', 'b' ]

Legal

This project is open source under the Apache Public License v2 and is developed by Axway, Inc and the community. Please read the LICENSE file included in this distribution for more information.