boc/landvex/node_modules/get-east-asian-width/utilities.js

/**
Binary search on a sorted flat array of [start, end] pairs.

@param {number[]} ranges - Flat array of inclusive [start, end] range pairs, e.g. [0, 5, 10, 20].
@param {number} codePoint - The value to search for.
@returns {boolean} Whether the value falls within any of the ranges.
*/
export const isInRange = (ranges, codePoint) => {
	let low = 0;
	let high = Math.floor(ranges.length / 2) - 1;
	while (low <= high) {
		const mid = Math.floor((low + high) / 2);
		const i = mid * 2;
		if (codePoint < ranges[i]) {
			high = mid - 1;
		} else if (codePoint > ranges[i + 1]) {
			low = mid + 1;
		} else {
			return true;
		}
	}

	return false;
};