Programming Articles - Page 346 of 3363

Swift provides an hasPrefix() function to check if a string starts with a specified substring. The hasPrefix() function returns a boolean value which indicates whether the specified substring matches the starting string characters of the input string. The hasPrefix() function is case sensitive, which means according to this function “a”, and “A” are two different values. Input String = “Ram got first place” SubString = “Ram” Output Yes Here, the characters of the substring match the starting characters of the input string. Syntax func hasPrefix(value) Here, the value represents a string. This function returns true if the ... Read More

Swift provides an hasSuffix() function to check a string end with a specified substring. The hasSuffix() function returns a boolean value which indicates whether the specified substring matches the ending characters of the input string. The hasSuffix() function is case sensitive that means according to this function “t”, and “T” are two different values. Input String = “Today is cloudy day” SubString = “day” Output yes Here, the character of the substring matches the ending characters of the input string. Syntax func hasSuffix(value) Here, the value represents a string. This function returns true if the value matches ... Read More

In Swift, a dictionary is an unordered collection in which data is stored in the form of key-value pairs. To add elements to a dictionary we can use any of the following methods − Using Bracket notation Using updateValue() method Method 1: Using Brackets Notation We can key-value pairs in the dictionary using bracket notation or we can say that using subscript notation. In this method, we can add a new key in the brackets and assign the corresponding value. If the specified key already exists, then it will replace the value of that key we the new ... Read More

After the declaration of an array, the elements of the array until certain index are rotated such that the first elements until the desired index are placed in the last, next to the last element of the array. Let us discuss this with an Input output scenario. Input Output Scenario Consider an array arr = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]. We can clearly say that the initial array consists of 10 elements and the index of the last element is 9. Let us assume that the array is rotated by two elements. ... Read More

The collection of homogenous elements within a single variable and in the contiguous memory location is known as array. The elements in array can be of any datatype but all the elements that are present in the array should be homogeneous, i.e., should belong to the same datatype. The arrays are a kind of special variables which actually store several values or elements in the name of a single variable with continuous memory locations which are accurately known as “ indices ”. Indices The word indices represents the plural form of index. The word index denotes the position of the ... Read More

When a two dimensional array or a 2D array is declared, it is treated like a matrix. So, we know that a matrix consists of rows and columns. The process of sorting the elements that belong to a particular column of a matrix either in ascending order or in descending order is known as sorting a 2D array across columns. Let us consider an algorithm followed by an Input output scenario to understand the exact application of this concept. Input Output Scenario Consider a two dimensional array. arr = [[ 7, 9, 5, 7 ], [9, 5, 9, 4], ... Read More

In Python, there are mainly two searching algorithms that are majorly used. Out of those, the first one is Linear Search and the second one is Binary Search. These two techniques are majorly used in order to search an element from the given array or from the given list also. While searching an element, there are two methodologies that can be followed in any kind of algorithm. One of those is recursive approach and the other is iterative approach. Let us discuss both algorithms in both approaches and solve similar problems. Linear Search The Linear Search technique is also known ... Read More

There are three different ways in order to delete or remove the element. Let us discuss some of those methods and keywords that are used to remove the last element from an array one after another in a row. Using Delete() Method of the Numpy Module This module can be used in order to delete an element of an array when an index is clearly specified. This operation can be done by the delete() method that belongs to the module numpy. But, in order to use that delete method, the array should be created in the form ... Read More

In order to remove the first element of the array, the index that must be considered is 0 as the index of the first element in any array is always 0. As like removing the last element from an array, removing the first element from the array can be processed using the same techniques. Let us apply those techniques in the deletion of first element of the array. We shall discuss the methods and keywords that are used to remove the first element from an array one after another in a row now. Using the pop() Method The method pop() ... Read More

An array is a collection of elements of same data type, and each element in the array is identified by an index value. It is a simplest data structure where each data element can be accessed directly by only using its index number. Arrays in Python Python does not have a specific data structure to represent arrays. Here, we can use List an array. [6, 4, 1, 5, 9] 0 1 2 3 4 The indexing in python starts from 0. In the above block the integers 6, 4, 1, 5, ... Read More