Remove numeric separators from Decimal, Binary, Hex and Octal literals
npm install babel-plugin-transform-numeric-separator> This plugin allows Babel to transform Decimal, Binary, Hex and Octal literals containing Numeric Literal Separator to their non-separated form.
``js
let budget = 1_000_000_000_000;
// What is the value of budget? It's 1 trillion!`
//
// Let's confirm:
console.log(budget === 10 ** 12); // true
`js
let nibbles = 0b1010_0001_1000_0101;
// Is bit 7 on? It sure is!
// 0b1010_0001_1000_0101
// ^
//
// We can double check:
console.log(!!(nibbles & (1 << 7))); // true
`
`js
// Messages are sent as 24 bit values, but should be
// treated as 3 distinct bytes:
let message = 0xA0_B0_C0;
// What's the value of the upper most byte? It's A0, or 160.
// We can confirm that:
let a = (message >> 16) & 0xFF;
console.log(a.toString(16), a); // a0, 160
// What's the value of the middle byte? It's B0, or 176.
// Let's just make sure...
let b = (message >> 8) & 0xFF;
console.log(b.toString(16), b); // b0, 176
// What's the value of the lower most byte? It's C0, or 192.
// Again, let's prove that:
let c = message & 0xFF;
console.log(c.toString(16), b); // c0, 192
`
hand wave emoji
Octals are great for permissions, but also look better when represented in 0o0000 form. No real benefit with separators here.
`sh`
npm install --save-dev babel-plugin-transform-numeric-separator
.babelrc
`json`
{
"plugins": ["transform-numeric-separator"]
}
`sh`
babel --plugins transform-numeric-separator script.js
`javascript`
require("babel-core").transform("code", {
plugins: ["transform-numeric-separator"]
});
If you need to further compile ES2015 Decimal, Binary, Hex and Octal number representations to their pre-ES2015 numeric literal form, add the "transform-es2015-literals" plugin:
> transform-es2015-literals is already included in babel-preset-env and babel-preset-es2015.
.babelrc
`json``
{
"presets": ["env"],
"plugins": ["transform-numeric-separator"]
}
{
"plugins": ["transform-numeric-separator", "transform-es2015-literals"]
}