JavaScript: output to the console

The tutor tests JavaScript code using the console.

I’ve long known about the JavaScript console, and use it sometimes for debugging. However, I didn’t know to use if for testing – until now.

In the past, I’d build a rudimentary web page around a JavaScript function, sending the output to a div using innerHTML. However, for checking continuity and logic, sending output to the console might be simpler. Testing it today, I’d just open Notepad, type

<script>

lines
of
code
to be
tested

console.log(Output you want to see);

</script>

then save the file as html and point the browser to it. Of course, at first, I’d just get a blank screen. F12 opens the developer tools, then clicking Console shows the output.

In the JavaScript code, the command

console.log(Output you want to see);

sends the output to the console. If for some reason there’s a problem, you know right away: that’s what the console is there to tell you. Therefore, it’s a great testing utility.

HTH:)

Source:

w3schools

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

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