Answers for "javascript check if property is defined"

how to check if object is undefined in javascript

if (typeof something === "undefined") {
    alert("something is undefined");
}

Posted by: Guest on November-26-2019

javascript check if boolean is undefined

if (typeof myFlag !== "undefined") {
  // comes here whether myFlag is true or false but not defined
}

Posted by: Guest on May-02-2020

test if property exists javascript

const hero = {
  name: 'Batman'
};

hero.hasOwnProperty('name');     // => true
hero.hasOwnProperty('realName'); // => false

Posted by: Guest on November-23-2020

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