[[[77.16893970966339,28.73860875130916],[77.17119693719724,28.74118657655823]]] how to read this in js code example

Example: how to use this in js

// In web browsers, the window object is also the global object:
console.log(this === window); // true

a = 37;
console.log(window.a); // 37

this.b = "MDN";
console.log(window.b)  // "MDN"
console.log(b)         // "MDN"