title: Ionic 4 Angular NgIf binding
body: <p>sorry for my bad English, I would like to consult how to implement * ngIf in this case:</p>
  
  <p>I have a string variable constructed like this:
  varname = 'a = 1 &amp;&amp; b = 2 &amp;&amp; c = 3 &amp;&amp; d = 0';
  I want to filter a list with elements that have the 4 properties, a, b, c and d.</p>
  
  <p>My question is <strong><em>how can I replace the condition inside the ngIf</em></strong> since it does NOT accept me * ngIf = "{{varname}}"</p>
  
  <p>Thank you very much for the help you could give me</p>
  
  <pre><code>Ionic:
  
    ionic (Ionic CLI)             : 4.11.0 (C:\Users\Estelita\AppData\Roaming\npm\node_modules\ionic)
    Ionic Framework               : @ionic/angular 4.11.5
    @angular-devkit/build-angular : 0.801.3
    @angular-devkit/schematics    : 8.1.3
    @angular/cli                  : 8.1.3
    @ionic/angular-toolkit        : 2.1.1
  
  Cordova:
  
     cordova (Cordova CLI) : 9.0.0 (cordova-lib@9.0.1)
     Cordova Platforms     : android 8.1.0
     Cordova Plugins       : not available
  
  System:
  
     Android SDK Tools : 26.1.1 (C:\Android)
     NodeJS            : v12.13.1 (C:\Program Files\nodejs\node.exe)
     npm               : 6.12.1
     OS                : Windows 8.1
  </code></pre>