Question

Considering text as an array variable, please explain the push method statement shown below:

var text = [];
text.push(document.getElementById('name').innerHTML || 0);

Answer 1

The trick is that an empty string is evaluated as false in boolean tests like this.

Example :

var a = "" || 0;          // a is set to 0 because "" is empty and is false
var b = "non-empty" || 0  // b is set to "non-empty" because it's not an empty string