Real Time Example: If we want to multiply 2 numbers through function but while calling if we pass only one number than we go result as NaN because we have passed only one value and second value automatically undefined so number*undefined becomes NaN (Not a Number). Previously this default value is used to test parameter values in the function body and assigned any value if they are undefined.
Anyway as we have development scope we can set any value to this function parameter. If it is function parameter then the default value is "undefined". JavaScript default values are said to be values which are assigned by JavaScript compiler. Introduction on Default Value in JavaScript Given below are the examples mentioned: Example #1 Its working is based on required values and values to be assigned through the function. Let suppose function expects 5 parameters but if we assign only 3 then rest of the values assigned by JavaScript compiler that is undefined.įunctionName(1,2,3) // NaN Examples of JavaScript Default Value If the condition is evaluated to false, the code.
The if/else statement is a part of JavaScript's 'Conditional' Statements, which are used to perform different actions based on different conditions. If the condition is false, another block of code can be executed. switch statement - use this statement if you want to select one of many sets of lines to execute. JavaScript if Statement If the condition is evaluated to true, the code inside the body of if is executed. The if/else statement executes a block of code if a specified condition is true. if.else statement - use this statement if you want to select one of two sets of lines to execute. This includes the JavaScript logical & operator.Web development, programming languages, Software testing & others How does Default Value work in JavaScript? In JavaScript we have three conditional statements: if statement - use this statement if you want to execute a set of code when a condition is true. You may embed expressions in JSX by wrapping them in curly braces. There are a few ways to inline conditions in JSX, explained below. It allows for an if this, then that approach to coding, where certain actions or statements will only be executed if certain conditions are met. While declaring a variable and using an if statement is a fine way to conditionally render a component, sometimes you might want to use a shorter syntax. What is Javascript Conditional Statement A javascript conditional statement is a type of programming logic that allows the code to make decisions based on conditions set by the programmer.
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