Day 18: Got a millisecond? ⏱️

#webdev #deno #beginners #webadvent

Oh gosh, look how the time flies! Only 604800000 milliseconds left till Christmas! Wonder how I know? That's all thanks to a library called ms.

It does two things: converts strings to a number of milliseconds and the other way around. Here, let me demonstrate.

Install the library as usual, e.g. deno add npm:ms and create a file, e.g. main.ts:

import ms from 'ms'
console.log(`Milliseconds till Christmas: ${ms('7 days')}`)

Now run with e.g. deno run -A ./main.ts:

deno run -A ./main.ts
# Milliseconds till Christmas: 604800000

How about the other way around? Change main.ts to the following code:

import ms from 'ms'

console.log(`123 456 789 milliseconds is about ${ms(123456789, {long: true})}`)

You'll hopefully find out that this amount of milliseconds is about a day: ms rounds up to the nearest sensible value, e.g:

import ms from 'ms'

console.log(ms(5000)) // 5s
console.log(ms(5499)) // 5s
console.log(ms(5500)) // 6s
console.log(ms(35000000)) // 10h

Got any ideas how you'd use it? Share in the comments!

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