Check Is String Javascript Code Example

Example 1: is string javascript

function isString(value) { 	return typeof value === 'string' || value instanceof String; }  isString(''); // true isString(1); // false isString({}); // false isString([]); // false isString(new String('teste')) // true

Example 2: if string javascript

if (typeof myVar === 'string') { /* code */ };

Example 3: js check if variable is string

if (typeof myVar === 'integer'){     //I am indeed an integer }  if (typeof myVar === 'boolean'){     //I am indeed a boolean }

Example 4: 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"

Example 5: if is a string javascript

function isString(x) {   return Object.prototype.toString.call(x) === "[object String]" }

Example 6: check if value is a string javascript

let eventValue = event.target.value;      if (/^\d+$/.test(eventValue)) {       eventValue = parseInt(eventValue, 10);     }  //If value is a string, it converts to integer.   //Otherwise it remains integer.