Can I write an if statement within a Javascript object when setting an attribute?

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Setting attributeTwo using an if statement. What is the correct way to do this?

var testBoolean = true;

var object = {
  attributeOne: "attributeOne",
  attributeTwo: if (testBoolean) { "attributeTwo" } else { "attributeTwoToo" },
}

No, however you can use the ternary operator:

var testBoolean = true;

var object = {
  attributeOne: "attributeOne",
  attributeTwo: testBoolean ? "attributeTwo" : "attributeTwoToo"
}

In Javascript, how to conditionally add a member to an object , This isn't exactly smooth (but it works), and if you have a lot of fields, you soon end up with a lot of if- statements. I could also do nifty things with� JavaScript Properties. Properties are the values associated with a JavaScript object. A JavaScript object is a collection of unordered properties. Properties can usually be changed, added, and deleted, but some are read only.

You can use an if statement, if it is within a immediately invoked function.

var x = {
  y: (function(){
       if (true) return 'somevalue';
     }())
};

How to conditionally build an object in JavaScript with ES6, If the condition is false, another block of code can be executed. The if/else In JavaScript we have the following conditional statements: Use if to specify a block � Else if Statement. With if and else, we can run blocks of code depending on whether a condition is true or false. However, sometimes we might have multiple possible conditions and outputs, and need more than simply two options. One way to do this is with the else if statement, which can evaluate more than two possible outcomes.

you can also do by this method

var testBoolean = true;

var object = {
  attributeOne: "attributeOne"
}

1

if(testBoolean){
   object.attributeTwo = "attributeTwo"
}else{
   object.attributeTwo = "attributeTwoToo"
}

2

object.attributeTwo = testBoolean ? "attributeTwo" : "attributeTwoToo"

JavaScript if/else Statement, The concept of objects in JavaScript can be understood with real life, tangible objects. Properties of JavaScript objects can also be accessed or set using a The following statement creates an object and assigns it to the variable x if and only if the Define the object type by writing a constructor function. elem.removeAttribute(name) – removes the attribute. These methods operate exactly with what’s written in HTML. Also one can read all attributes using elem.attributes: a collection of objects that belong to a built-in Attr class, with name and value properties. Here’s a demo of reading a non-standard property:

You can't use an if statement directly, but you can use ternary operator (aka conditional operator) which behaves the way you want. Here is how it would look:

var testBoolean = true;

var object = {
  attributeOne: "attributeOne",
  attributeTwo: testBoolean ? "attributeTwo" : "attributeTwoToo"
}

Working with objects, The conditional (ternary) operator is the only JavaScript operator that takes three This operator is frequently used as a shortcut for the if statement. it can be " chained" in the following way, similar to an if … else if … else if … else chain: Object initializer � Operator precedence � Optional chaining (?.)� Objects can be initialized using new Object(), Object.create(), or using the literal notation (initializer notation). An object initializer is a comma-delimited list of zero or more pairs of property names and associated values of an object, enclosed in curly braces ({}).

Indeed you can but why don't you do the conditional statement before assigning it to object attribute. The code would be nicer.

Conditional (ternary) operator, Today I needed to create a JavaScript object to pass to MongoDB, based on some Similarly, || will only evaluate to false if both condition is falsey. return the value of the last expression that gets evaluated in the statement. Even if you write a whole cookie string to document.cookie, when you read it out again, you can only see the name-value pair of it. If you set a new cookie, older cookies are not overwritten. The new cookie is added to document.cookie, so if you read document.cookie again you will get something like: cookie1 = value; cookie2 = value;

Conditionally adding keys to JavaScript objects using spread , [2017-04-28] dev, javascript, esnext, pattern. (Ad, please don't block). This blog post shows how you can conditionally add elements inside Array literals The spread operator for object literals does nothing if its operand is an object without into an object could be possible by setting the key to null or undefined via object�

Conditionally adding entries inside Array and object literals, In JavaScript, an object is a standalone entity, with properties and type. Properties of JavaScript objects can also be accessed or set using a bracket notation. to wrap the object literal in parentheses if the object appears where a statement For example, if the second <FORM> tag in a document has a NAME attribute of�

Working with objects in JavaScript � WebPlatform Docs, In this example, you can use the ternary operator as the shortcut for the if-else statement The expression_1 , and expression_2 are expressions of any type. of the ternary operator in ES5 is to set default parameters of a function, for example: JavaScript Objects � Object Properties � Prototype � Object Creation Patterns�

Comments
  • use short hand if: (attributeTwo: (true ? some_value : some_other_value);
  • @Rooster—that would be the conditional operator, also called a ternary operator. :-)
  • @RobG short hand if is a much better and easier to remember name ;-P
  • No problemwith that, but in a technical forum it's good to include the appropriate technical term. :-)
  • Thank you soo much man ! I was just dtruggling from one day and suddenly i used your answer and boom it is done !!!
  • Should be a comment not an answer