Explanation
“@instance:” allows us to attach an object/value to the Foo class instead of Foo’s prototype. Recall that “@” in CoffeeScript refers to JavaScript’s “this”.
After “@instance:” there is a function that is immediately executed. This function returns a function, closed around a variable called instance. Both these functions have their context (their “this”) bound to the Foo object using CoffeeScript’s wonderful “define and bind” operator “=>” as opposed to the normal function definition operator “->”.
When called, the function that “@instance” ends up referring to simply checks to see if the “instance” variable is empty and if so, assigns a new instance of Foo to it. Newing up a Foo is done using the “@” symbol since the function’s “this” refers to the Foo object. It then returns the instance.
Output
The CoffeeScript above compiles down to this:
Thanks for the clear advice. More at affordable auto glass repair High Point .
Appreciate the focus on longevity. Extend screen life with professional Pool Screen Repair by pool cage repair experts .
Don’t forget about garage side doors. I had mine secured by lock repair services after a free consultation.
For tradition vanities, fee Remodeler for a Bathroom Remodeler San Jose CA with in-condominium carpentry.
This was highly useful. For more, visit acoso laboral Sevilla .
Геосинтетические материалы https://stsgeo.ru для строительства купить можно у нас с профессиональным подбором и поддержкой. Продукция для укрепления оснований армирования дорожных одежд защиты гидроизоляции и дренажа. Предлагаем геотекстиль разных плотностей георешётки геомембраны композитные материалы.
We had ice dams last year—turns out ventilation and insulation were the culprits. Getting a roofing audit from kitchener roofers” to fix it before the snow hits.