Comment by Stephan de Vries on "Creating your own scripting language? Where should one start?"

Creating a scripting language as an alternative to JavaScript requires you to:

Create your own syntax.
Define this syntax in a specification.
Write an interpreter that understands this new syntax. This interpreter can be written in any programming language, though you'll probably want to use C or C++. You need to know everything about memory allocation and algorithms. In the end browser developers are assigned to this task, but convincing browsers to adopt your new scripting language probably requires you to provide a proof of concept.

If you managed to do all that, you need to propose your specification to an organization like TC39. Convincing them is probably the hardest part of all, since companies have heavily invested in EcmaScript. Aside from that, if your proposition were to be accepted, it would require A LOT of money, since browser developers all around the world would need to implement your specification.

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