@extra-array/middle-update/size.js

import indexRange from './indexRange';
/**
 * Counts the number of values.
 * @param x an array
 * @param i start index (-ve: from right) (0)
 * @param I end index (-ve: from right) (X)
 */
function size(x, i = 0, I = x.length) {
    var [i, I] = indexRange(x, i, I);
    return I - i;
}
export default size;
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