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8 Cards in this Set
- Front
- Back
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Describe a callback function |
Passing a function as an argument through another function - often seen within methods |
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Describe the difference between function declarations and expressions |
Declaration: Defines a named function without requiring variable assignment (ex: function bar () { return: 3;}). Declarations are hoisted and the entire function body is lifted with it Expression: Must start with “var”, and is not hoisted. Must be defined above code that is invoking |
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What is asynchronous execution? |
Decouples data layer from presentation layer to create dynamic content on webpages without the need to reload a site. With event-based asynchronous APIs, developers register an event handler for a given object (e.g. HTML Element or other DOM objects) and then call the action. The browser will perform the action usually in a different thread, and trigger the event in the main thread when appropriate. |
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Describe JavaScript Methods |
JavaScript methods are the actions that can be performed on objects. A JavaScript method is actually a function definition stored as a property value (in an object). var person = { firstName: "John", lastName : "Doe", fullName : function() { return this.firstName + " " + this.lastName; }}; document.getElementById("demo").innerHTML = person.fullName(); |
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Regular expressions |
Everything is essentially a character, and we are writing patterns to match a specific sequence of characters |
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What is this? |
this is a DOM element. this sets the scope of the callback function to the element which is the subject of the callback |
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jQuery Method Chaining |
Allows us to run multiple jQuery commands, one after the other, on the same element(s). This way, browsers do not have to find the same element(s) more than once. |
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Event Object |
need to fill in info |
