JS The String data type

String string data type

All single and double quotation marks, the anti-wrap are quoted string.

Other types of values ​​converted to a string

• [val].toString()
• String concatenation

var age =18;
var ageAsString = age.toString() // "11"

let a = 10 + null + true + [] + undefined + 'Hello' + null + [] + 10 + false;

console.log(a) // 11undefinedHellonull10false
console.log(let a = 10 + null + true + [] + undefined + 'Hello' + null + [] + 10 + false;

console.log(10 + null + true + [] + undefined + 'Hello' + null + [] + 10 + false)

let str = 'Hello World'

Case Analysis:

• The first step, 10 + null => 10null value is converted into 0, 10 + 0 = 10.
• The second step, 10 + true => 11to true value is converted to 1, 10 + 11 =
• The third step, 11 + [] => "11"[] is converted to an empty string, numeric and string + number changes encountered connector 11 + "" = "11"
• The fourth step, "11" + undefined=> "11undefined" after the + strings using, as a connector, the back of the same
• All final result is 11undefinedHellonull10false