javascript check is string code example
Example 1: is string javascript
function isString(value) {
return typeof value === 'string' || value instanceof String;
}
isString('');
isString(1);
isString({});
isString([]);
isString(new String('teste'))
Example 2: if string javascript
if (typeof myVar === 'string') { };
Example 3: 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)
alert(typeof numericalValue)
alert(typeof stringValue)
alert(typeof stringObject)
Example 4: if is a string javascript
function isString(x) {
return Object.prototype.toString.call(x) === "[object String]"
}
Example 5: check if value is a string javascript
let eventValue = event.target.value;
if (/^\d+$/.test(eventValue)) {
eventValue = parseInt(eventValue, 10);
}