wesbos

function is_blog () {
	global  $post;
	$posttype = get_post_type($post );
	return ( ((is_archive()) || (is_author()) || (is_category()) || (is_home()) || (is_single()) || (is_tag())) && ( $posttype == 'post')  ) ? true : false ;
}


Usage: 

 <?php if (is_blog()) { echo 'You are on a blog page'; } ?>

csknk

<?php require_once(get_template_directory() . '/lib/nav.php'); ?>
<header class="banner navbar navbar-default navbar-static-top" role="banner">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target=".navbar-collapse">
        <span class="sr-only"><?= __('Toggle navigation', 'sage'); ?></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>

janwillemtulp

<script>
  let password = ''

  const hash = s =>
    s.split('').reduce((a, b) => {
      a = (a << 5) - a + b.charCodeAt(0)
      return a & a
    }, 0)

  $: console.log(password, hash(password))