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larvitutils

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larvitutils

Misc utilities

Convert a buffer to an Uuid

const	utils	= require('larvitutils'),
    uuid	= utils.formatUuid(new Buffer('f9684592b24542fa88c69f16b9236ac3', 'hex'));

console.log(uuid); // f9684592-b245-42fa-88c6-9f16b9236ac3

Example usecase: fetch a binary column from a database and convert to a readable Uuid string

Format a hex string to uuid

const	utils	= require('larvitutils'),
    uuid	= utils.formatUuid(' f9684592b24542fa88c69f16b9236ac3'); // Notice the starting space getting trimmed away

console.log(uuid); // f9684592-b245-42fa-88c6-9f16b9236ac3

hrtimeToMs()

Used to convert hrtime() calls to milliseconds, since hrtime() output is messy (seconrds + nanoseconrds)

Usage:

const	utils	= require('larvitutils'),
    startTime	= process.hrtime();

setTimeout(function() {
    console.log('benchmark took %d ms', utils.hrtimeToMs(startTime, 4));
    // benchmark took 34.0005 ms
}, 34);

Uuid string to buffer

const	utils	= require('larvitutils'),
    uuidStr	= 'f9684592-b245-42fa-88c6-9f16b9236ac3';

utils.uuidToBuffer(uuidStr); // Will return a buffer

Replace all for strings

const	utils	= require('larvitutils'),
    str	= 'f9684592-b245-42fa-88c6-9f16b9236ac3';

utils.replaceAll('-', '_', str); // f9684592_b245_42fa_88c6_9f16b9236ac3

Validate an uuid string

const	utils	= require('larvitutils'),
    validUuid	= 'f9684592-b245-42fa-88c6-9f16b9236ac3',
    invalidUuid1	= false,
    invalidUuid2	= 'foobar',
    invalidUuid3	= {'höhö': 'oveboll'};

utils.formatUuid(validUuid);	// true
utils.formatUuid(invalidUuid1);	// false
utils.formatUuid(invalidUuid2);	// false
utils.formatUuid(invalidUuid3);	// false

Instances

Just a very simple object intended to keep instances of objects across moduels.

file 1:

const	utils	= require('larvitutils');

let foo;

function Foo() {}

foo = new Foo();
foo.bar = 'baz';

utils.instances.foo = foo;

file 2:

const	utils	= require('larvitutils'),
    foo	= utils.instances.foo;

console.log(foo.bar); // 'baz'