COMMENTS

  1. Best Way for Conditional Variable Assignment

    There are two methods I know of that you can declare a variable's value by conditions. Method 1: If the condition evaluates to true, the value on the left side of the column would be assigned to the variable. If the condition evaluates to false the condition on the right will be assigned to the variable. You can also nest many conditions into ...

  2. Conditional (ternary) operator

    The conditional (ternary) operator is the only JavaScript operator that takes three operands: a condition followed by a question mark (?), then an expression to execute if the condition is truthy followed by a colon (:), and finally the expression to execute if the condition is falsy. This operator is frequently used as an alternative to an if ...

  3. javascript

    4. = is assignment, but in conditional statements you need to check for equality ( == ), check if something is greater ( > ), check if something is less ( <) etc. You are assigning the variable j the length of myName rather than checking some condition on this line: for(var j = i;j = myName.length;){. Instead you probably need to do something ...

  4. Expressions and operators

    This chapter describes JavaScript's expressions and operators, including assignment, comparison, arithmetic, bitwise, logical, string, ternary and more. At a high level, an expression is a valid unit of code that resolves to a value. There are two types of expressions: those that have side effects (such as assigning values) and those that ...

  5. How to Use the Ternary Operator in JavaScript

    Inside the function, we use the ternary operator to check if the number is even or odd. If the number modulo 2 equals 0 (meaning it's divisible by 2 with no remainder), then the condition evaluates to true, and the string "even" is assigned to the result variable. If the condition evaluates to false (meaning the number is odd), the string "odd ...

  6. Making decisions in your code

    Here we've got: The keyword switch, followed by a set of parentheses.; An expression or value inside the parentheses. The keyword case, followed by a choice that the expression/value could be, followed by a colon.; Some code to run if the choice matches the expression. A break statement, followed by a semicolon. If the previous choice matches the expression/value, the browser stops executing ...

  7. How to Use the Ternary Operator in JavaScript

    In this example, I used the ternary operator to determine whether a user's age is greater than or equal to 18. Firstly, I used the prompt() built-in JavaScript function. This function opens a dialog box with the message What is your age? and the user can enter a value. I store the user's input in the age variable.

  8. JavaScript Conditionals: The Basics with Examples

    Conditional statements control behavior in JavaScript and determine whether or not pieces of code can run. There are multiple different types of conditionals in JavaScript including: "If" statements: where if a condition is true it is used to specify execution for a block of code.

  9. Mastering JavaScript Conditional Operators: A Comprehensive Guide

    The primary conditional operators in JavaScript include: if…else Statement: This classic statement allows developers to execute a block of code if a specified condition is true.

  10. JavaScript Ternary Operator

    In the first ternary operator, we have the conditional expression score > 70. After the first question mark, we have the true expression which is "Excellent". After the first colon, the next expression is supposed to be the false expression. For the false expression, we declare another conditional expression using the ternary operator.

  11. Making decisions in your code

    An expression or value inside the parentheses. The keyword case, followed by a choice that the expression/value could be, followed by a colon. Some code to run if the choice matches the expression. A break statement, followed by a semi-colon. If the previous choice matches the expression/value, the browser stops executing the code block here ...

  12. Assignment (=)

    The assignment operator is completely different from the equals (=) sign used as syntactic separators in other locations, which include:Initializers of var, let, and const declarations; Default values of destructuring; Default parameters; Initializers of class fields; All these places accept an assignment expression on the right-hand side of the =, so if you have multiple equals signs chained ...

  13. Expressions and operators

    Expressions and operators. This chapter describes JavaScript's expressions and operators, including assignment, comparison, arithmetic, bitwise, logical, string, ternary and more. A complete and detailed list of operators and expressions is also available in the reference.

  14. Assignment operators

    An assignment operator assigns a value to its left operand based on the value of its right operand.. Overview. The basic assignment operator is equal (=), which assigns the value of its right operand to its left operand.That is, x = y assigns the value of y to x.The other assignment operators are usually shorthand for standard operations, as shown in the following definitions and examples.

  15. JavaScript Assignment Operators

    An assignment operator ( =) assigns a value to a variable. The syntax of the assignment operator is as follows: let a = b; Code language: JavaScript (javascript) In this syntax, JavaScript evaluates the expression b first and assigns the result to the variable a. The following example declares the counter variable and initializes its value to zero:

  16. if...else

    condition. An expression that is considered to be either truthy or falsy.. statement1. Statement that is executed if condition is truthy.Can be any statement, including further nested if statements. To execute multiple statements, use a block statement ({ /* ... */ }) to group those statements.To execute no statements, use an empty statement.. statement2

  17. Conditional (ternary) operator

    An expression which is executed if the condition is falsy (that is, has a value which can be converted to false). Description. Besides false, possible falsy expressions are: null, NaN, 0, the empty string (""), and undefined. If condition is any of these, the result of the conditional expression will be exprIfFalse. A simple example:

  18. JavaScript Features You Need to Know to Master React

    The conditional operator (or ternary operator) allows you to write simple conditional expressions in JavaScript. It takes three operands: a condition followed by a question mark (?), an expression to execute if the condition is truthy followed by a colon (:), a second expression to execute if the condition is falsy. const drink = personAge >= 18 ?

  19. javascript: using an assignment statement where a conditional

    Actually, this is somewhere between incorrect and misleading. An assignment simply evaluates to its RHS. For instance, if geo is a property, it might have a getter, but that getter will never be called when evaluating the if condition. Then you say geo will then be coerced to a boolean.This is also incorrect.

  20. Logical OR assignment (||=)

    Description. Logical OR assignment short-circuits, meaning that x ||= y is equivalent to x || (x = y), except that the expression x is only evaluated once. No assignment is performed if the left-hand side is not falsy, due to short-circuiting of the logical OR operator. For example, the following does not throw an error, despite x being const: js.

  21. Using classes

    JavaScript is a prototype-based language — an object's behaviors are specified by its own properties and its prototype's properties. However, with the addition of classes, the creation of hierarchies of objects and the inheritance of properties and their values are much more in line with other object-oriented languages such as Java. In this section, we will demonstrate how objects can be ...