javascript syntax for check null or undefined or empty
if (typeof value !== 'undefined' && value) {
//deal with value'
};javascript syntax for check null or undefined or empty
if (typeof value !== 'undefined' && value) {
//deal with value'
};javascript check if undefined or null or empty string
// simple check do the job
if (myString) {
// comes here either myString is not null,
// or myString is not undefined,
// or myString is not '' (empty).
}javascript check if variable is empty
if( value ) {
//
}
/**
* This will evaluate to true if value is not:
* null
* undefined
* NaN
* empty string ("")
* 0
* false
*/javascript validate if string null undefined empty
/**
* Checks the string if undefined, null, not typeof string, empty or space(s)
* @param {any} str string to be evaluated
* @returns {boolean} the evaluated result
*/
function isStringNullOrWhiteSpace(str) {
return str === undefined || str === null
|| typeof str !== 'string'
|| str.match(/^ *$/) !== null;
}Copyright © 2021 Codeinu
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