examples/bower_components/polymer/polymer.js
function resolveBindingValue(oldValue, value) {
    if (value === undefined && oldValue === null) {
      return value;
    }
    return (value === null || value === undefined) ? oldValue : value;
  }
function resolveBindingValue(oldValue, value) {
    if (value === undefined && oldValue === null) {
      return value;
    }
    return (value === null || value === undefined) ? oldValue : value;
  }
function resolveBindingValue ( oldValue , value ) { if ( value === undefined && oldValue === null ) { return value ; } return ( value === null || value === undefined ) ? oldValue : value ; }
capture A's value if B's value is null or undefined, otherwise use B's value
capture A s value if B s value is null or undefined otherwise use B s value