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) {...}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) {...}js check if variable is string
if (typeof myVar === 'integer'){
//I am indeed an integer
}
if (typeof myVar === 'boolean'){
//I am indeed a boolean
}Copyright © 2021 Codeinu
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