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Computed Property Macros for Ember

Ember. Versions between 0.9.8 and 1.1 should work fine. (If you're running Ember 0.9.x and want the CP macros from Ember 1.0, the ember_09 branch has them.)

Just add index.js to your page after Ember but before your app.

• among -- returns true if the original value is among the given literals (testing using ===)
• encodeURIComponent -- calls encodeURIComponent on the original value
• encodeURI -- calls encodeURI on the original value
• fmt -- pass the original values into a format-string
• htmlEscape -- escapes the original value with Handlebars.Utils.escapeExpression and wraps the result in a Handlebars.SafeString (since it's now safe)
• ifNull -- fall back on a default value
• notAmong -- inverse of among
• notEqual -- inverse of the built-in equal macro
• notMatch -- inverse of the built-in match macro
• promise -- wraps the original value in an already-resolved promise
• safeString -- wraps the original value in a Handlebars.SafeString
• join -- joins the supplied values together with a provided sepatator

Person = Ember.Object.extend({

  name: null,

  handedness: null,

  greeting: null,

  handle: EmberCPM.Macros.ifNull('name', 'Anonymous'),

  greeting: EmberCPM.Macros.fmt('name', 'greeting', '%@ says, "%@!"'),

  canUseLeftHand: EmberCPM.Macros.among('handedness', 'left', 'ambidextrous'),

  notNamedJohn: EmberCPM.Macros.notMatch('name', /\bJohn\b/)

});

If you would prefer to use Ember.computed.{macro} instead of EmberCPM.Macros.{macro} (for the sake of uniform access), simply call EmberCPM.install() before your application code.