Linear helpers can be nested in each other and in block helpers. To use one helper inside another, you need to write it in parentheses (helper) instead of curly brackets {{helper}}.
For example, you can use it in mathematical calculations, when you need to transfer one calculation to another. For example, you can write expression 10 + 5 − 15 like this:
{{add 10 (subtract 5 15)}}
You obtain zero.
You can embed as deeply as you need:
{{add 10 (subtract 5 (multiply (divide 10 2) 3))}}
And here, you obtain zero again. Mathematically, it can be written as follows: 10 + (5 − ((10 ᛬ 2) × 3))
In block helpers, for example, we can embed the calculation of client's balance in helper #gte:
{{#gte (subtract balance cost) 0}}
Great, you have enough money to buy this course
{{else}}
It seems that there is not enough money in your account to buy the course
{{/gte}}