Uncaught TypeError: $(...) is not a function will javascript kill me?

Question

JavaScript

When a table row is clicked, it displays the contents of the first column
alert(this.cells[0].text()); // gives 7
now
typeof(this.cells[0].text()) ; // gives number
now
var lead_id=this.cells[0].text(); // Uncaught TypeError: $(...) is not a function
// Well, WHAT does he need ???

Answer 1

Did nothing bother you?

Answer 2

You are deceiving :) There var lead_id=this.cells[0].text();cannot be such an error on the line in principle.
Somewhere you lost jQuery, but where is unclear from the question.
Make a minimally broken example on the codepen and most likely you will find the cause of the error yourself.

Answer 3

cells is an HTMLCollection, i.e. an array-like object containing references to html elements. Not jquery objects. And there is no .text() function for table elements .
To appear, you need to make a jquery object from an element, i.e.$(something.cells[n]).text()

Answer 4

Yes, there is jquery . I
read a book for dummies, looked at the docks, but the skis don’t go, it’s some kind of hell ....
Screenshot of the error from the console