Evaluating as a JS-expression

Include calculations and JS-features in your scenarios 🧠

There is an opportunity to turn on evaluating your expression as a JavaScript code (ECMAScript 5.1):
Turning ON/OFF the option in a filter 
Remember, that if you turn on this option and make a mistake in the syntax, the scenario will stall with an exception message.
Checking the expression
You can check the result of evaluating you expression by clicking Check the expression link. Here you have to provide an ID of the object:
Checking the expression providing an object with ID=1
Don't mix "Check the expression" feature with step testing.
Examples of evaluating as a JS expression
Expression
🅾️ JS-interpreter is off
✅ JS-interpreter is on
{{a}} +1
// {{a}} = 3 
3 + 1
4
Math.random()
Math.random()
0.4353
// some random value 0.0–1.0
Today +1 day
and similar expressions
Today +1 day
2020-05-04T00:00:00.000Z
// today at 00:00
'{{a}}'.length
// {{a}} == hello world
'hello world'.length
12
'{{a}}'.length
// {{a}} == 1,-12,hello
(array type)
'1,12,hello'.length
11
// Note! It evaluates as a string.
Learn how to deal with arrays​
Don't forget to quote the '{{fields}}' if you want them to be processed as string.
Other resources
​MDN JavaScript Guide - Get a high-level overview of fundamental JavaScript concepts.
​Codecademy Introduction to JavaScript - Learn JavaScript in this free online course with interactive lessons.

Advanced templating techniques

Next - Template system

Comparison component

Last updated 3 months ago

Expression	🅾️ JS-interpreter is off	✅ JS-interpreter is on
`{{a}} +1` `// {{a}} = 3`	`3 + 1`	`4`
`Math.random()`	`Math.random()`	`0.4353` `// some random value 0.0–1.0`
`Today +1 day` and similar expressions	`Today +1 day`	`2020-05-04T00:00:00.000Z` `// today at 00:00`
`'{{a}}'.length` `// {{a}} == hello world`	`'hello world'.length`	`12`
`'{{a}}'.length` `// {{a}} == 1,-12,hello (array type)`	`'1,12,hello'.length`	`11` `// Note! It evaluates as a string.` Learn how to deal with arrays