DEV Community: Opeyemi Noah

Day 4/100 day of SwiftUI

Opeyemi Noah — Sat, 13 Aug 2022 02:47:16 +0000

Mission log 4.

Type Annotation

Type annotation let us state what data type we want for our variable and constant.

example:

var name: String = "Opeyemi"

Type inference is when swift is able to figure out the data type of a variable or constants, based on value we assign.

example:

var name = "John Doe"

From the snippet above , swift will infer the data type to be String, because we assign text value to the variable.

Day 3/100 day of SwiftUI

Opeyemi Noah — Fri, 12 Aug 2022 15:52:43 +0000

Mission log 3,

Day 3 is all about grouping data
I learnt all about Array, Set,Dictionary and Enum.

Day 2/100 day of SwiftUI

Opeyemi Noah — Sat, 06 Aug 2022 10:08:00 +0000

Mission log 2, and i apologize if i wont be able to go into details.

It's day 2 of 100 days of swiftui course offered by HWS + and yes it has been interesting so far.

Day 2 is all about Booleans, string interpolation

i learn't the following:

How to store truth with boolean

var isItRaining = false

How to join two strings together In swift there are two ways to join strings

by using + operator
by using interpolation

// Interpolation

var name = "Opeyemi"
var introduction = "My name is \(name)"

//output : My name is Opeyemi

NOTE: I noticed how + operator can be used for multiple operation, and this is referred to as OPERATOR OVERLOADING

Swift Basic: Constants and Variable

Opeyemi Noah — Sat, 30 Apr 2022 23:32:11 +0000

A moment will come where you will need to store data, irrespective of the programming of your choice.

In swift there are two ways to do this ,

Variable
Constants

Whats a variable ?

Variable is a data store that can have its value changed anytime.

variable have value that can vary - Paul Hudson
"var" keyword is used to denote variable

Whats a Constant ?

Constant is a data store that cant have its value changed once it is set or specified.

constant have value that are constant (cannot be changed).
"let" keyword is used to denote constant.

Convert Integer value to Hour:Minute:Seconds in dart

Opeyemi Noah — Fri, 25 Jun 2021 02:14:33 +0000

As a developer, there are times that you 'll need to convert a integer values to time remaining, It could be during the course of using Stream or something else.

Below is a good approach to handle the situation

Not so fast,

To understand the code below you need to understand some basic time conversion.

1. one(1) hour =3600 seconds

Definitely to convert let's say 2 hours to seconds we 'll have 2*3600 = 7200 seconds

2. one(1) minute = 60 seconds

Definitely to convert 2minutes to seconds we 'll have
2*60 =120 seconds

3. one(1) seconds = 1 seconds

String intToTimeLeft(int value) {
  int h, m, s;

  h = value ~/ 3600;

  m = ((value - h * 3600)) ~/ 60;

  s = value - (h * 3600) - (m * 60);

  String result = "$h:$m:$s";

  return result;
}

Output


0:0:0

And if you decide to go with one with more muscle

String intToTimeLeft(int value) {
  int h, m, s;

  h = value ~/ 3600;

  m = ((value - h * 3600)) ~/ 60;

  s = value - (h * 3600) - (m * 60);

  String hourLeft = h.toString().length < 2 ? "0" + h.toString() : h.toString();

  String minuteLeft =
      m.toString().length < 2 ? "0" + m.toString() : m.toString();

  String secondsLeft =
      s.toString().length < 2 ? "0" + s.toString() : s.toString();

  String result = "$hourLeft:$minuteLeft:$secondsLeft";

  return result;
}

Output


00:00:00

That wraps up everything ..See you in the next one