nodejs typeof source code example
Example 1: check data type in javascript
typeof("string"); //string
typeof(123); //number
Example 2: javascript check type of variable var
> typeof "foo"
"string"
> typeof true
"boolean"
> typeof 42
"number"
typeof("string"); //string
typeof(123); //number
> typeof "foo"
"string"
> typeof true
"boolean"
> typeof 42
"number"