what is nspredicate in swift?
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NSPredicate is a Foundation class that specifies how data should be fetched or filtered. Its query language, which is like a cross between a SQL WHERE clause and a regular expression, provides an expressive, natural language interface to define logical conditions on which a collection is searched.
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Swift and Java are both static-type, which ensures the code safety. Swift and Java are compiled-languages, That's great for speed needs. Swift is still a fresh language, So Java has more third-party libraries and more support than Swift.
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['Make sure you have Safari open (the default iPhone web browser).', 'Tap the Search Field at the top of your screen (where the address bar is located).', 'Type in the word you want to search for on the webpage. ... ', 'Then, under On This Page, tap Find "word or phrase you\'re searching for".']
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A simple predicate is the main verb or verb phrase of a sentence that tells what the subject does. A simple predicate is only the main verb or verb phrase of a sentence. It does not include any modifiers in the sentence.
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NSObject is the base class for most ObjC objects. In Swift you would inherit from it if you want your Swift object to be an ObjC object (with all the advantages and drawbacks that implies), but don't have a more specific ObjC object in mind.
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Sets are unordered collections of unique values. Dictionaries are unordered collections of key-value associations. Arrays, sets, and dictionaries in Swift are always clear about the types of values and keys that they can store. This means that you cannot insert a value of the wrong type into a collection by mistake.
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Swift implements arrays - and all other collection types - as generic types. They can store any type: instances of classes, structs, enumerations, or any built-in type like Int, Float, Double, etc.
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Subclassing NSObject in Swift gets you Objective-C runtime flexibility but also Objective-C performance. Avoiding NSObject can improve performance if you don't need Objective-C's flexibility. Edit: ... This allows us to instruct Swift that a method should use dynamic dispatch, and will therefore support interception.
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A NSString object is immutable, but that doesn't stop you from changing the value of a variable which points to a string.
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FOPL stands for First Order Predicate Logic. It is one where the quantification is over simple variables and variables can appear only inside a predicate. It permits reasoning about world entities , functions and relations. It also used to assets logical reasoning.
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Most modern iOS apps are written in the Swift language which is developed and maintained by Apple. Objective-C is another popular language that is often found in older iOS apps. Although Swift and Objective-C are the most popular languages, iOS apps can be written in other languages as well.
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Terms in this set (14) What is the difference between the terms keyword and argument in the IOS command structure? A keyword is a specific parameter. ... A keyword is a specific parameter. An argument is not a predefined variable.
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Subject Verb. Definition: The simple predicate of a sentence is the verb that is done in the sentence. It can be the action that happens, the state of being, or the linking verb.
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NSNumber is a subclass of NSValue that offers a value as any C scalar (numeric) type. It defines a set of methods specifically for setting and accessing the value as a signed or unsigned char , short int , int , long int , long long int , float , or double or as a BOOL .
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Specifically, it looks for a nib file with an appropriate name (without the . ... It looks for a nib file whose name matches the name of the view controller class. For example, if the class name is MyViewController , it looks for a MyViewController. nib file.
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NSSet: Unordered collection of data. ... It is also collection type object.
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UITextField does not make any difference between an empty string and a nil string. ... Also, there was no way in Objective-C to prevent users from assigning nil to a property. The resulting contract is that text can be optional.