array-range/index.js

creates a new array with given range

module.exports = function newArray(start, end) {
    var n0 = typeof start === 'number',
        n1 = typeof end === 'number'

    if (n0 && !n1) {
        end = start
        start = 0
    } else if (!n0 && !n1) {
        start = 0
        end = 0
    }

    start = start|0
    end = end|0
    var len = end-start
    if (len<0)
        throw new Error('array length must be positive')
    
    var a = new Array(len)
    for (var i=0, c=start; i<len; i++, c++)
        a[i] = c
    return a
}