ut2/lib/clamp.js

一个现代 JavaScript 实用工具库。[点击查看在线文档]。

'use strict';

var defaultTo = require('./defaultTo.js');
var native = require('./internals/native.js');
var toNumber = require('./toNumber.js');

var clamp = function (number, lower, upper) {
    if (upper === native.nativeUndefined) {
        upper = lower;
        lower = native.nativeUndefined;
    }
    if (upper !== native.nativeUndefined) {
        upper = defaultTo(toNumber(upper), 0);
    }
    if (lower !== native.nativeUndefined) {
        lower = defaultTo(toNumber(lower), 0);
    }
    number = toNumber(number);
    if (number === number) {
        if (upper !== native.nativeUndefined) {
            number = number <= upper ? number : upper;
        }
        if (lower !== native.nativeUndefined) {
            number = number >= lower ? number : lower;
        }
    }
    return number;
};

module.exports = clamp;