@extra-array/length/index.js

'use strict';
function index(x, i = 0) {
    return i < 0 ? Math.max(x.length + i, 0) : Math.min(i, x.length);
}
function indexRange(x, i = 0, I = x.length) {
    i = index(x, i);
    I = Math.max(i, index(x, I));
    return [i, I];
}
function size(x, i = 0, I = x.length) {
    var [i, I] = indexRange(x, i, I);
    return I - i;
}
function length(x, i = 0, I = x.length) {
    return size(x, i, I);
}
module.exports = length;