An Idea for a Babel Plugin

babel-unicode-math.md

babel-unicode-math

Create a Babel plugin that replaces the following symbols.

Functions

• x ⇒ x → x => x
• x → x → x => x
• x ⤍ x → x => x

Comparison

• a ⩶ b → a === b

• a ≡ b → a === b

• a ≢ b → a !== b

• a ⩵ b → a == b

• a ≈ b → a == b

• a ≠ b → a != b

• a ≤ b → a <= b

• a ≥ b → a => b

Bitwise Operators

• a « b → a << b

• a » b → a >> b

• a ⊻ b → a ^ b

• a ∨ b → a | b

• a «= b → a <<= b

• a »= b → a >>= b

• a ⊻= b → a ^= b

• a ∨= b → a | b

Arithmetic Operators

• a − b → a - b

• a ∙ b → a * b

• a ⋅ b → a * b

• a ÷ b → a / b

• a ∙= b → a *= b

• a ⋅= b → a *= b

• a ÷= b → a /= b

• x⧺ → x++

• ⧺x → ++x

• √ x → Math.sqrt(x)

• ∛ x → Math.pow(x, 1/3)

• ∜ x → Math.pow(x, 1/4)

• ⌈x⌉ → Math.ceil(x)

• ⌊x⌋ → Math.floor(x)

• ~ x → Math.round(x)

Logical Operators

• ‼ x → !! x

• ¬ x → ! x

• a ∧ b → a && b

• a ∨ b → a || b

• ∃ x → ( 'undefined' typeof x && x !== null)

Constants

• π → Math.Pi
• ℇ → Math.E
• √2 → Math.SQRT2

Arrays

• a ∈ b → b.indexOf(a) >= 0
• ∃ a ∈ b ( … ) → b.some a => …
• ∀ a ∈ b ( … ) → b.every a => …
• a ∈ b ( … ) → b.filter a => …

Flow Control

• ⋲ … → switch (…)
• • x → case x:
• 🌙 x → yield x
• ⟳ … → while (…) todo: use the Power Sleep Mode symbol for yield once it's supported.

More crazy stuff

• a ≔ 3 → let a = 3
• …args → ...args
• ⌦ a.b → delete a.b
• |x| → Math.abs(x) – may conflict with a|b|c
• x⁰¹²³⁴⁵⁶⁷⁸⁹ → Math.pow(x, 123456789)
• xⁿ → Math.pow(x, n)
• xⁱ → Math.pow(x, i)
• ⁿ√ x → Math.pow(x, 1/n)

Promises

• a ↳ b → a.then(b)
• a ⇥ b → a.catch(b)