@extra-array/left-update/indexRange.js

Gets values from the left.

import index from './index!';
/**
 * Gets index range of part of array.
 * @param x an array
 * @param i start index (-ve: from right) (0)
 * @param I end index (-ve: from right) (X)
 * @returns [start index, end index]
 */
function indexRange(x, i = 0, I = x.length) {
    i = index(x, i);
    I = Math.max(i, index(x, I));
    return [i, I];
}
export default indexRange;
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