Blockchain without cryptocurrency? 🤔

Erik — Tue, 09 Oct 2018 04:43:03 +0000

I'm seeing lots of discussions and press releases about intentions to regulate blockchain dissociated from cryptocurrency with intention to apply it as a validation network to industry, banks and government.

Assuming that we are not on a solar powergrid, my question is:

If there is no currency involved, who would join a mining pool and spend 1365W/h (actual Antminer S9i power consumption) to validate blocks for free?

I read an interview with the president of Federation of Industries of the State of São Paulo (In a raw translation) saying:

"[...] With an eye on the impact this technology will have on the entire industry chain, which can reduce costs, waste and bureaucratic processes, as well as increase productivity [...]"

What is the point to save X money with papers and bureaucracy and spend X*10^3 with electricity?

What is the difference between Methods, Computed, and Watchers?

Erik — Tue, 18 Sep 2018 19:37:56 +0000

I'm following Vue's getting started and I'm getting confused, tried CSS Tricks and Stack Overflow and still not understanding it in practice. Someone needs to explain me like i'm five.

What I got so far:

Computed - They are cached based on dependency and only re-evaluate on dependency change.

Methods -

A method invocation will always run the function whenever a re-render happens.

What exactly defines a render or re-render? Every data:value change?

Computed and methods has the same structure, but their location on code are different... 🤔🤔🤔

//vm instance
computed: {
    // a computed getter
    reversedMessage: function () {
      // `this` points to the vm instance
      return this.message.split('').reverse().join('')
    }
  }
//...

// in component
methods: {
  reverseMessage: function () {
    return this.message.split('').reverse().join('')
  }
}
//...

Watch - I got confused about this one, Vue's getting started says it is a callback, alerts that is better to use computed, but don't explain for what it is used for...

I will appreciate any clarification on this topic 👍

DEV Community: Erik

Blockchain without cryptocurrency? 🤔

Assuming that we are not on a solar powergrid, my question is:

What is the difference between Methods, Computed, and Watchers?

What I got so far: