To check if a JavaScript array is empty or not, you can make either of the following checks (depending on your use case): const empty = !Array.isArray(array) || !array.length; const notEmpty = Array.isArray(array
Example 2 : React check if string is null or empty In this second example of this tutorial, we use React JS to check if a string is empty or null using a simple condition. The condition is !str || str.trim() === "", which means that the string is either falsy (such as null,...
If we were creating an array, it would be an empty array. Next, we need to figure out what the parameters are for the function we pass to .reduce. In our example, we named them total and num. Remember, this function is going to be called for each element in the array. The reason...
Javascript - Assign 0 if the value is null or empty in, Using || operator or just a simple ternary operator would work if its null, undefined or ''. But it won't work for a blank space like this one ' ' (since Boolean (' ') evaluates as true) which it's not good if you wa...
_.isEmpty({1, 2, 3}) => false _.isEmpty({}) => trueisArray_.isArray(object)Returns true if object is an Array._.isArray({1,2,3}) => trueisObject_.isObject(value)Returns true if value is an Object. Note that JavaScript arrays and functions are objects, while (normal) ...
JavaScript Number isFinite Method - Learn about the JavaScript Number isFinite method, how it works, and its importance in validating finite numbers in your code.
Falsy values in JavaScript are:undefined,null,false, ,0,""(empty string),NaN(not a number). import{useEffect, useState}from'react'; export default function App() { const [message, setMessage] = useState(null); useEffect(() => {if(message) { ...
is.empty(value:array|object|string) Checks if the given value is empty. is.existy(value:any) Checks if the given value is existy. (not null or undefined) is.truthy(value:any) Checks if the given value is truthy. (existy and not false) is.falsy(value:any) Checks if the given valu...
As one of the Handlebars developers advised: it is best to check for the length property of the variable, to catch cases where an array might be empty: {{#if userActive.length}} Welcome, {{firstName}} {{/if}} As noted above, theifhelper does not evaluate conditional logic, so we...
FieldValue File URLspec/models/packages/package_file_spec.rb#L27 Filenamespec/models/packages/package_file_spec.rb DescriptionPackages::PackageFile validations is expected to validate that :package cannot be empty/falsy Test levelunit Hashcca57ec700ae5599b3a0449fe87cb30228244a047 ...