Understanding Object Destructuring in JavaScript Functions
When invoking a JavaScript function with an object as an argument, the traditional approach involves defining the function as follows:
function moo(myArgObj) { print(myArgObj.a); }
However, certain JavaScript engines, such as SpiderMonkey, support a more concise syntax for defining functions:
function moo({ a, b, c }) { // valid syntax! print(a); // prints 4 }
This syntax utilizes a feature known as "destructuring," which allows extracting specific properties from an object during function definition.
Mechanism of Destructuring
Destructuring involves using curly braces ({ }) within the function parameters to directly assign specific object properties to local variables. In our example:
Thus, the above function expects an object with an a property and instantly assigns its value to the local variable a.
Resources for Further Information
For comprehensive details on destructuring, consult the following resources:
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