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In this tutorial, we will learn what "use strict" does in JavaScript. The "use strict" is a directive. JavaScript 1.8.5 is its origin. The use strict directive says that the JavaScript code must run in the strict mode. The strict directive is not a statement but rather a constant expression. Earlier JavaScript versions ignore this expression. We can't use undeclared variables when writing the code in strict mode. Except for IE9 and lower versions, all modern browsers support this JavaScript directive. Strict mode allows us to write a cleaner code as it throws errors when we use undeclared variables in ... Read More
In this tutorial, we will discuss what the operator || does in a var statement in JavaScript. The logical OR operator or logical disjunction on the operands returns true if any of the operand values are true, false, ’’, null, undefined, 0, and NaN are the false values. All other values are true. The logical OR operands must be either boolean, integer, or a pointer kind. The logical OR returns the latest operand if there is no true value. The logical OR executes from left to right. Users can follow the syntax below for using the logical OR operator. Syntax ... Read More
In this article, we will show you how to select elements from a NumPy array in python. Numpy Array in Python A NumPy array is a central data structure of the NumPy library, as the name implies. The name of the library is an abbreviation for "Numeric Python" or "Numerical Python. NumPy, in other words, is a Python library that serves as the foundation for scientific computing in Python. One of these tools is a high-performance multidimensional array object, which is a powerful data structure for efficient array and matrix computation. We can select a single element or a subarray ... Read More
In this tutorial, we will learn what “javascript: void(0)” means. In English, void means nothing. In a programming language, void means return nothing. “javascript: void(0)” is similar to void. javascript: void(0) means return undefined as a primitive value. We use this to prevent any negative effects on a webpage when we insert some expression. For example, in the case of URL hyperlinks. Hyperlinks open by reloading the page when the user clicks on the link. When you need to run some other code in such cases, you can use javascript: void(0). Let’s split javascript: void(0) with a colon. We get ... Read More
In this article, we will show you how to calculate the inverse of a matrix or ndArray using NumPy library in python. What is inverse of a matrix? The inverse of a matrix is such that if it is multiplied by the original matrix, it results in an identity matrix. The inverse of a matrix is just the reciprocal of the matrix, as in regular arithmetic, for a single number that is used to solve equations to obtain the value of unknown variables. The inverse of a matrix is the matrix that, when multiplied by the original matrix, produces the ... Read More
In this tutorial, we will discuss plugins in JavaScript. So what is a plugin? A plugin is a JavaScript code written in a file. This file supplies various methods that we can use for various purposes. A plugin has an entry in the array. An entry has following properties − name − The name is the plugin name. filename − filename is the executable file loaded to install the plugin with the extension. description − description is the developer's(manufacturer's) description of the plugin. mimeTypes − mimeTypes is an array with one entry for each MIME type that the plugin ... Read More
In this article, we will learn what characters are valid for JavaScript variable names. We use variables to save values. First, we have to define the variable, and then we can assign a value to it. We can use the variable name to access the variable in the code. With a variable name, we can reassign its value. As you adhere to a few principles, variable names are quite versatile. Rules A letter, dollar sign($), or underscore (_) must make up the first character. A number cannot be the initial character. Any letter, number, or underscore can complete the ... Read More
In this article, we will show you how to flatten a matrix using the NumPy library in python. numpy.ndarray.flatten() function The numpy module includes a function called numpy.ndarray.flatten() that returns a one-dimensional copy of the array rather than a two-dimensional or multi-dimensional array. In simple words, we can say that it flattens a matrix to 1-Dimension. Syntax ndarray.flatten(order='C') Parameters order − 'C', 'F', 'A', 'K' (optional) When we set the order parameter to 'C, ' the array is flattened in row-major order. When the 'F' is set, the array is flattened in column-major order. Only when 'a' is ... Read More
In this tutorial, let us discuss the three types of errors we can expect in our JavaScript code. Errors are statements that block the execution of the program. During the compilation of the program, three types of errors can occur. These are syntax errors, run time errors, and logical errors. Syntax Errors Syntax errors are usual errors. Incorrect syntax causes parsing issues during the code interpretation. For example, add a semicolon instead of a colon in an object declaration. Syntax errors affect only the respective code thread. The remaining code works as it is. A grammatical mistake is the ultimate ... Read More
In this tutorial, we will learn how we can find the coordinates of the mouse cursor with JavaScript. We have to find out the X and Y-coordinates or we can say that the horizontal and the vertical position of the cursor on the screen with JavaScript. JavaScript provides us with two different properties to get the coordinates of the mouse cursor when the mouse button is pressed anywhere on the screen − Using event.clientX Property Using event.clientY Property Using event.clientX Property The event.clientX property is used to find out the value of the horizontal position or the X-coordinate ... Read More