Instructions vs Expressions

Daniel Sokil — Sat, 21 Nov 2020 18:45:23 +0000

Instructions (statements) are executed
Expressions (values) are evaluated

Here is one of my favorite ways to illustrate it:

In JavaScript if we nest console.log

console.log(console.log(console.log("AnAmazingValue")))

we get

AnAmazingValue
undefined
undefined

And in Scala

println(println(println("AnAmazingValue")))

returns

AnAmazingValue
()
()

To conclude, JavaScript instruction console.log does not return a value (hence the undefined), while Scalas println expression returns the value () of type Unit.

Simplify Your Flexing

Daniel Sokil — Thu, 18 Jun 2020 20:40:26 +0000

Center Children Vertically & Horizontally

<main>
  <div>1</div>
  <div>2</div>
  <div>3</div>
</main>

/* Parent Takes Up Screen Width & Height*/
html, body, main {
  width: 100%;
  height: 100%;
}

main {
  display: flex;
  /* Will Wrap On Smaller Screens */
  flex-wrap: wrap;
  /* Center On X & Y Axis */
  place-content: center;
}

DEV Community: Daniel Sokil

Instructions vs Expressions

Simplify Your Flexing

Center Children Vertically & Horizontally