Feature watch: ECMAScript 2018

This blog post tracks what features may be included in ES2018. I will continually update it.

Proposed ECMAScript 2018 features

Recall that every ECMAScript feature proposal goes through stages:

• Stage 4 means that a feature will be in the next release (or the one after that).
• Stage 3 means that a feature still has a chance of being included in the next release.

Stage 4 and part of ECMAScript spec draft

(No proposals at this time.)

Candidate features (stage 3)

The following features are currently at stage 3:

• SIMD.JS – SIMD APIs (John McCutchan, Peter Jensen, Dan Gohman, Daniel Ehrenberg)
• Function.prototype.toString revision (Michael Ficarra)
• Template Literal Revision (Tim Disney)
• global (Jordan Harband)
• Rest/Spread Properties (Sebastian Markbåge)
• Asynchronous Iteration (Domenic Denicola)
• import() (Domenic Denicola)

FAQ

What do the stages mean?

They refer to maturity stages of the so-called “TC39 process”. Check chapter “The TC39 process for ECMAScript features” in “Exploring ES2016 and ES2017” for more information.

How is [my favorite proposed feature] doing?

If you are wondering what stages various proposed features are in, consult the readme of the ECMA-262 GitHub repository.

Further reading

The following books by me are free to read online:

• ECMAScript 5: “Speaking JavaScript”
• ECMAScript 6: “Exploring ES6”
• ECMAScript 2016 & 2017: “Exploring ES2016 and ES2017”