Answers for "javascript check if variable exists then check its value"

15

javascript check if variable exists

if (typeof myVar !== 'undefined') {
    // myVar is defined
}
Posted by: Guest on July-23-2019
1

How can I test whether a variable has a value in JavaScript?

if (typeof variable == "undefined") {...} --> return true if variable undefined

//An empty string evaluates to FALSE in JavaScript so you can just do:
if (variable) {...}
Posted by: Guest on December-03-2020

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