paple.blogg.se - Javascript conditional

Below are some of the examples where they could be used: The premise of true or false conditions has been used in JavaScript executions for a long time.

switch: The switch condition is a way of executing different scripts based on the set conditions.

if.else if.else: This conditional statement specifies a series of conditions that trigger an action, and an alternative script is executed if all specified conditions are false.

if.else: This conditional specifies an action to be triggered if a certain condition is true and an alternative action to be triggered if the condition is false.

if: This conditional specifies a condition which triggers an action if found to be true.

On examination, there fundamentally are four approaches to JavaScript conditional statements, which namely are: In JavaScript, conditional statements guide actions based on a specific true-or-false logic. One reason why conditional statements are so numerous is because they represent one of the most basic foundational pillars of any programming language. In essence, conditional statements work on the basis of true and false scenarios, which inform the decision for running a specific task. So, you can imagine, then, that conditional statements are pretty prevalent and important in coding, especially in JavaScript. Such conditions may be that the user inputs something, or certain results are achieved, besides many other possible conditions.

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).There's virtually an infinite number of cases in programming where you are required to execute tasks based on certain conditions. 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 Web development, programming languages, Software testing & others How does Default Value work in JavaScript?