javascript tutorial - [Solved-5 Solutions] Check if a variable is a string - javascript - java script - javascript array
Problem:
Check if a variable is a string
Solution 1:
var booleanValue = true;
var numericalValue = 354;
var stringValue = "This is a String";
alert(typeof booleanValue) // displays "boolean"
alert(typeof numericalValue) // displays "number"
alert(typeof stringValue) // displays "string"click below button to copy the code. By JavaScript tutorial team
Solution 2:
lodash / Underscore.js
if(_.isString(myVar))
//it's a string
else
//it's something elseclick below button to copy the code. By JavaScript tutorial team
jQuery
if($.type(myVar) === "string")
//it's a string
else
//it's something elseclick below button to copy the code. By JavaScript tutorial team
Solution 3:
['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp'].forEach(
function(name) {
window['is' + name] = function(obj) {
return toString.call(obj) == '[object ' + name + ']';
};
});click below button to copy the code. By JavaScript tutorial team
Solution 4:
var s = 'String';
var a = [1,2,3];
var o = {key: 'val'};
(s.constructor === String) && console.log('its a string');
(a.constructor === Array) && console.log('its an array');
(o.constructor === Object) && console.log('its an object');
(o.constructor === Number || s.constructor === Boolean) && console.log('this won\'t run');click below button to copy the code. By JavaScript tutorial team
Solution 5:
var x = "hello"
if(x === x.toString(){
// it's a string
}else{
// it isn't
}