Answers for "check if parameter is a string javascript"

check if value string js

var value = "test string"
console.log(typeof value === "string")

javascript check if var is string

if (typeof a_string === 'string') {
    // this is a string
}

if variable is string javascript

var booleanValue = true; 
var numericalValue = 354;
var stringValue = "This is a String";
var stringObject = new String( "This is a String Object" );
alert(typeof booleanValue) // displays "boolean"
alert(typeof numericalValue) // displays "number"
alert(typeof stringValue) // displays "string"
alert(typeof stringObject) // displays "object"