ut2/lib/range.js

一个现代 JavaScript 实用工具库。[点击查看在线文档]。

'use strict';

var native = require('./internals/native.js');
var isNil = require('./isNil.js');
var toFinite = require('./toFinite.js');

var range = function (start, end, step) {
    start = toFinite(start);
    if (isNil(end)) {
        end = start;
        start = 0;
    }
    else {
        end = toFinite(end);
    }
    step = toFinite(step);
    if (!step) {
        step = start < end ? 1 : -1;
    }
    var index = -1;
    var length = native.mathMax(native.mathCeil((end - start) / step), 0);
    var result = Array(length);
    while (length--) {
        result[++index] = start;
        start += step;
    }
    return result;
};

module.exports = range;