Replace or= with ?=

[liqweed]

CoffeeScript 1.3.1 made or= a syntax error. Conditional assignment should be made with the ?= operator.

[fson]

The change log says "Conditional assignment of previously undefined variables", so it doesn't mean the syntax is depracated, only that the variable must be defined first.

[Zegnat]

Both or= and ?= throw an error in CoffeeScript 1.3.3 unless the variable has been previously defined. This issue should be closed.

@liqweed: Conditional assignment should be made with the ?= operator. ↩

As far as actually replacing or= with ?= is concerned, bear in mind that these two are not synonymous and cannot be swapped without it changing the JavaScript output:

// variable = null
var variable;
variable = null;

// variable ?= 'value'
if (variable == null) {
  variable = 'value';
}

// variable or= 'value'
variable || (variable = 'value');

Note also, and this might be important to some, that ?= will throw a warning when your code is going through JavaScript Lint:

comparisons against null, 0, true, false, or an empty string allowing implicit type conversion (use === or !==)