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31 lines
997 B
31 lines
997 B
2 months ago
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// @ts-nocheck
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/**
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* 生成一个数字范围的数组
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* @param start 范围的起始值
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* @param end 范围的结束值
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* @param step 步长，默认为 1
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* @param fromRight 是否从右侧开始生成，默认为 false
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* @returns 生成的数字范围数组
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*/
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export function range(start: number, end: number, step: number = 1, fromRight: boolean = false): number[] {
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let index = -1;
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// 计算范围的长度
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let length = Math.max(Math.ceil((end - start) / (step || 1)), 0);
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// 创建一个长度为 length 的数组
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const result = new Array(length);
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// 使用循环生成数字范围数组
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while (length--) {
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// 根据 fromRight 参数决定从左侧还是右侧开始填充数组
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result[fromRight ? length : ++index] = start;
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start += step;
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}
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return result;
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}
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// 示例
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// console.log(range(0, 5)); // 输出: [0, 1, 2, 3, 4]
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// console.log(range(1, 10, 2, true)); // 输出: [9, 7, 5, 3, 1]
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// console.log(range(5, 0, -1)); // 输出: [5, 4, 3, 2, 1]
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