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:
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ข้อมูลชุดนี้ ให้ข้อมูลดี ค่ะ
ผม เคยเห็นเนื้อหาในแนวเดียวกันเกี่ยวกับ มุมมองที่คล้ายกัน
ซึ่งอยู่ที่ Owen
เหมาะกับคนที่สนใจเรื่องนี้
มีการสรุปเนื้อหาไว้อย่างดี
ขอบคุณที่แชร์ เนื้อหาดีๆ นี้
จะรอติดตามเนื้อหาใหม่ๆ ต่อไป
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لمینت دندان – لیفت لثه – دنتال هپی
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