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They are a handy way to store a set of related items of the same type such as stringsthough in reality, an array can include multiple types of items, including other arrays. The key portion can be any string.
This pattern creates a function expression and then immediately executes the function. This pattern is extremely useful for cases where you want to avoid polluting the global namespace with your code — no variables declared inside of the function are visible outside of it.
Passing functions as arguments is an extremely common idiom in jQuery. However, the result can be confusing — for example, the type of an Array is "object".
The value of this is determined using a simple series of steps: If the function is invoked using Function. If the function being invoked was created using Function. If the function is being invoked as a method of an object, this will refer to that object.
Otherwise, the function is being invoked as a standalone function not attached to any object, and this will refer to the global object. A function invoked using Function. My name is Rebecca' myObject. My name is Colin' A function created using Function. My name is the global object' myObject.
My name is Rebecca' secondObject. My name is Colin' Note When invoking a function deep within a long namespace, it is often tempting to reduce the amount of code you need to type by storing a reference to the actual function as a single, shorter variable.
It is important not to do this with instance methods as this will cause the value of this within the function to change, leading to incorrect code operation.
My name is undefined' You can, however, safely reduce everything up to the object on which the method is invoked: My name is Rebecca' Scope "Scope" refers to the variables that are available to a piece of code at a given time. A lack of understanding of scope can lead to frustrating debugging experiences.
When a variable is declared inside of a function using the var keyword, it is only available to code inside of that function — code outside of that function cannot access the variable. On the other hand, functions defined inside that function will have access to to the declared variable.
The same sort of behavior exists with functions defined within loops — the function "sees" the change in the variable's value even after the function is defined, resulting in all clicks alerting 5. How to lock in the value of i?
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Animation guru Joseph Gilland breaks down the world of special effects animation with clear step-by-step diagrams and explanations on how to create the amazing and . This tutorial will show you how to create an animation of a marker writing out a logo or a few words, followed by a slick reveal to an actual logo.
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