how to check if the type of a variable is string in js code example

Example 1: 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 2: javascript check if var is string

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