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Contents
# The JS module provides syntax sugar for calling native javascript
# operators (e.g. typeof, instanceof, new, delete) and global functions
# (e.g. parseFloat, parseInt).
module JS
# Use delete to remove a property from an object.
def delete(object, property)
`delete #{object}[#{property}]`
end
# The global object
def global
`Opal.global`
end
# Use in to check for a property in an object.
def in(property, object)
`#{property} in #{object}`
end
# Use instanceof to return whether value is an instance of the function.
def instanceof(value, func)
`#{value} instanceof #{func}`
end
# Use new to create a new instance of the prototype of the function.
if `typeof Function.prototype.bind == 'function'`
def new(func, *args, &block)
args.insert(0, `this`)
args << block if block
`new (#{func}.bind.apply(#{func}, #{args}))()`
end
else
def new(func, *args, &block)
args << block if block
f = `function(){return func.apply(this, args)}`
f.JS[:prototype] = func.JS[:prototype]
`new f()`
end
end
# Use typeof to return the underlying javascript type of value.
# Note that for undefined values, this will not work exactly like
# the javascript typeof operator, as the argument is evaluated before
# the function call.
def typeof(value)
`typeof #{value}`
end
# Use void to return undefined.
def void(expr)
# Could use `undefined` here, but this is closer to the intent of the method
`void #{expr}`
end
# Call the global javascript function with the given arguments.
def call(func, *args, &block)
g = global
args << block if block
g.JS[func].JS.apply(g, args)
end
alias method_missing call
extend self
end
Version data entries
40 entries across 40 versions & 1 rubygems