I don't understand logical operators using strings ans boolean values

I don't understand logical operators using strings ans boolean values

I'm newbie in Javascript and I'm trying to understand logical operators. I'm reading this document:<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_operators" target="_blank">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_operators</a>

I'm newbie in Javascript and I'm trying to understand logical operators. I'm reading this document:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_operators

For example:

var a1 =  true && true;     // t && t returns true
var a2 =  true && false;    // t && f returns false
var a3 = false && true;     // f && t returns false

I get this part because are boolean values. I believe is the same thing as:

var a1 =  1 && 1;    // t && t returns 1
var a2 =  1 && 0;    // t && f returns 0
var a3 =  0 && 0;    // f && t returns 0

But when string appear, I get confused.

var a6 = false && 'Cat';    // f && t returns false
var a7 = 'Cat' && false;    // t && f returns false
var a5 = 'Cat' && 'Dog';    // t && t returns Dog

How can I compare boolean value with strings? What is the value of each string?

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