In this tutorial, you will learn how to check if a string is null or empty using three popular JavaScript frameworks: React, Vue, and plain JavaScript. and also use tryit to edit your code
Vue Js Check if String is Empty:In Vue.js, you can check if a string is empty using the v-if directive along with the trim method. The trim method removes any whitespace from the beginning and end of the string, leaving only its content. You can then use
Here's a Code Recipe to check if an object is empty or not. For newer browsers, you can use plain vanilla JS and use the new "Object.keys" 🍦 But for older browser support, you can install the Lodash library and use their "isEmpty" method 🤖 ...
The typeof operator can be used to check if a variable is undefined by comparing its type with the string ‘undefined’. Here is an example of the code. let a; console.log(typeof a === 'undefined'); // true This method is safe because it won’t throw an error if the variable ...
function isCheck(arr) { for (let i = 0; i < arr.length; i++) { if (arr[i] === 0) { arr[i] = 'zero'; } else if (arr[i] % 2 === 0) { arr[i] = 'even'; } else { arr[i] = 'odd'; } } return arr; } 上述代码中,我们遍历了数组arr中的每个元素,并根据特定...
check if the string contains spaces by passing a whitespace string to the method. Since the method returns an index when a whitespace exists, we can check if the value is greater than or equal to zero which returnstrueif there is a whitespace in any index of the string andfalseif ...
If an V6 addressed mapped as v4 is given it will convert it to V4, If any other V6 address is given it isnormalizedinto the longer version and plain V4 addresses are left alone. Returns a empty string if a invalid IP console.log(displayIP(null));// ''console.log(displayIP('::ffff...
getMessage(err)- Retrieves the message of an error orerritself if it's a String. Iferrorerr.messageis undefined we return an empty String. varcheckError=require('check-error'); .compatibleInstance(err, errorLike) varcheckError=require('check-error');varfuncThatThrows=function(){thrownewType...
test.js fix: add support for Redmi mobile (#46) Oct 16, 2024 README Security is-mobile Check if mobile browser, based on useragent string. Example varmobile=require('is-mobile');console.log(mobile());// => false API mobile({ [ua], [tablet], [featureDetect] }) ...
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