在PHP中,您可以。。。
range(1, 3); // Array(1, 2, 3)
range("A", "C"); // Array("A", "B", "C")
也就是说,有一个函数可以通过传递上下限来获得一系列数字或字符。
JavaScript本机是否有内置的功能?如果没有,我将如何实施?
在PHP中,您可以。。。
range(1, 3); // Array(1, 2, 3)
range("A", "C"); // Array("A", "B", "C")
也就是说,有一个函数可以通过传递上下限来获得一系列数字或字符。
JavaScript本机是否有内置的功能?如果没有,我将如何实施?
当前回答
/**
* @param {!number|[!number,!number]} sizeOrRange Can be the `size` of the range (1st signature) or a
* `[from, to]`-shape array (2nd signature) that represents a pair of the *starting point (inclusive)* and the
* *ending point (exclusive)* of the range (*mathematically, a left-closed/right-open interval: `[from, to)`*).
* @param {!number} [fromOrStep] 1st signature: `[from=0]`. 2nd signature: `[step=1]`
* @param {!number} [stepOrNothing] 1st signature: `[step=1]`. 2nd signature: NOT-BEING-USED
* @example
* range(5) ==> [0, 1, 2, 3, 4] // size: 5
* range(4, 5) ==> [5, 6, 7, 8] // size: 4, starting from: 5
* range(4, 5, 2) ==> [5, 7, 9, 11] // size: 4, starting from: 5, step: 2
* range([2, 5]) ==> [2, 3, 4] // [2, 5) // from: 2 (inclusive), to: 5 (exclusive)
* range([1, 6], 2) ==> [1, 3, 5] // from: 1, to: 6, step: 2
* range([1, 7], 2) ==> [1, 3, 5] // from: 1, to: 7 (exclusive), step: 2
* @see {@link https://stackoverflow.com/a/72388871/5318303}
*/
export function range (sizeOrRange, fromOrStep, stepOrNothing) {
let from, to, step, size
if (sizeOrRange instanceof Array) { // 2nd signature: `range([from, to], step)`
[from, to] = sizeOrRange
step = fromOrStep ?? 1
size = Math.ceil((to - from) / step)
} else { // 1st signature: `range(size, from, step)`
size = sizeOrRange
from = fromOrStep ?? 0
step = stepOrNothing ?? 1
}
return Array.from({length: size}, (_, i) => from + i * step)
}
示例:
控制台日志(范围(5),//[0,1,2,3,4]//size:5范围([2,5]),//[2,3,4]//[2、5)//从:2(含)到:5(不含)范围(4,2),//[2,3,4,5]//大小:4,从:2开始范围([1,6],2),//[1,3,5]//从:1到:6,步骤:2范围([1,7],2),//[1,3,5]//从:1到:7(不含),步骤:2)<脚本>函数范围(sizeOrRange、fromOrStep、stepOrNothing){让从、到、步长、大小if(sizeOrRange instanceof Array){//第二个签名:`range([from,to],step)`[from,to]=sizeOrRange步骤=来自或步骤??1.size=数学ceil((to-from)/步长)}else{//第一个签名:`range(大小,从,步)`size=sizeOrRangefrom=来自或步骤??0step=stepOrNothing??1.}return Array.from({length:size},(_,i)=>from+i*step)}</script>
其他回答
我最喜欢的是生成器generateRange,它带有另一个运行生成器的函数getRange。与许多其他解决方案相比,这样做的一个优点是不需要的阵列不会多次创建。
function* generateRange(start, end, step = 1) {
let current = start;
while (start < end ? current <= end : current >= end) {
yield current;
current = start < end ? current + step : current - step;
}
}
function getRange(start, end, step = 1) {
return [...generateRange(start, end, step)];
}
console.log(getRange(0, 5)) // [ 0, 1, 2, 3, 4, 5 ]
console.log(getRange(10, 0, 2)) // [ 10, 8, 6, 4, 2, 0 ]
我正在分享我的实现,以防它对某人有所帮助。
function Range(start_or_num, end = null, increment = 1) {
const end_check = end === null
const start = end_check ? 0 : start_or_num
const count = end_check ? start_or_num : Math.round((end - start) / increment) + 1
const filterFunc = end_check ? x => x >= start : x => x < end && x >= start
return [...Array.from(
Array(count).keys(), x => increment * (x - 1) + start
)
].filter(filterFunc)
}
// usage
// console.log(Range(4, 10, 2)) // [4, 6, 8]
// console.log(Range(5, 10 )) //[5, 6, 7, 8, 9]
// console.log(Range(10 ))// [0, 1, 2, 3, 4, 5, 6, 7, 8]
可以使用带有数组、for循环和Math.random()变量的函数来解决这个问题。for循环将数字推入数组,数组将包含您范围内的所有数字。然后Math.random()根据数组的长度随机选择一个。
function randNumInRange(min, max) {
var range = []
for(var count = min; count <= max; count++) {
range.push(count);
}
var randNum = Math.floor(Math.random() * range.length);
alert(range[randNum]);
}
数字
[...Array(5).keys()];
=> [0, 1, 2, 3, 4]
字符迭代
String.fromCharCode(...[...Array('D'.charCodeAt(0) - 'A'.charCodeAt(0) + 1).keys()].map(i => i + 'A'.charCodeAt(0)));
=> "ABCD"
迭代
for (const x of Array(5).keys()) {
console.log(x, String.fromCharCode('A'.charCodeAt(0) + x));
}
=> 0,"A" 1,"B" 2,"C" 3,"D" 4,"E"
作为函数
function range(size, startAt = 0) {
return [...Array(size).keys()].map(i => i + startAt);
}
function characterRange(startChar, endChar) {
return String.fromCharCode(...range(endChar.charCodeAt(0) -
startChar.charCodeAt(0), startChar.charCodeAt(0)))
}
类型化函数
function range(size:number, startAt:number = 0):ReadonlyArray<number> {
return [...Array(size).keys()].map(i => i + startAt);
}
function characterRange(startChar:string, endChar:string):ReadonlyArray<string> {
return String.fromCharCode(...range(endChar.charCodeAt(0) -
startChar.charCodeAt(0), startChar.charCodeAt(0)))
}
lodash.js_.range()函数
_.range(10);
=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
_.range(1, 11);
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
_.range(0, 30, 5);
=> [0, 5, 10, 15, 20, 25]
_.range(0, -10, -1);
=> [0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
String.fromCharCode(..._.range('A'.charCodeAt(0), 'D'.charCodeAt(0) + 1));
=> "ABCD"
没有库的旧非es6浏览器:
Array.apply(null, Array(5)).map(function (_, i) {return i;});
=> [0, 1, 2, 3, 4]
console.log([…Array(5).keys()]);
(ES6归功于尼尔斯·彼得索恩和其他评论者)
没有本机方法。但您可以使用Array的过滤方法来实现。
var范围=(数组,开始,结束)=>array.filter((元素,索引)=>索引>=开始和索引<=结束)警报(范围(['a','h','e','l',''','o','s'],1,5))//['h','e','l','o']