我正在寻找以下方法的任何替代方法,以创建包含1到N的JavaScript数组,其中N仅在运行时已知。
var foo = [];
for (var i = 1; i <= N; i++) {
foo.push(i);
}
对我来说,我觉得应该有一种不用循环的方法。
我正在寻找以下方法的任何替代方法,以创建包含1到N的JavaScript数组,其中N仅在运行时已知。
var foo = [];
for (var i = 1; i <= N; i++) {
foo.push(i);
}
对我来说,我觉得应该有一种不用循环的方法。
当前回答
可以使用函数生成器或函数*表达式。这里是[https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/function]以及对函数生成器链接的引用[https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function].
设a=1,b=10;
函数*范围(a,b){对于(var i=a;i<=b;++i)收益率i;}
数组.来自(范围(a,b));// [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
[…范围(a,b)]// [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
其他回答
使用ES2015/ES6排列运算符
[...Array(10)].map((_, i) => i + 1)
console.log([…数组(10)].map((_,i)=>i+1))
使用递归的ES6解决方案。不同于所有其他解决方案
const range = (n, A = []) => (n === 1) ? [n, ...A] : range(n - 1, [n, ...A]);
console.log(range(5));
Array.from({ length: (stop - start) / step + 1}, (_, i) => start + (i * step));
资料来源:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from
https://stackoverflow.com/a/49577331/8784402
使用Delta
对于javascript
smallest and one-liner[...Array(N)].map((v, i) => from + i * step);
示例和其他备选方案
Array.from(Array(10).keys()).map(i => 4 + i * 2);
//=> [4, 6, 8, 10, 12, 14, 16, 18, 20, 22]
[...Array(10).keys()].map(i => 4 + i * -2);
//=> [4, 2, 0, -2, -4, -6, -8, -10, -12, -14]
Array(10).fill(0).map((v, i) => 4 + i * 2);
//=> [4, 6, 8, 10, 12, 14, 16, 18, 20, 22]
Array(10).fill().map((v, i) => 4 + i * -2);
//=> [4, 2, 0, -2, -4, -6, -8, -10, -12, -14]
[...Array(10)].map((v, i) => 4 + i * 2);
//=> [4, 6, 8, 10, 12, 14, 16, 18, 20, 22]
Range Function
const range = (from, to, step) =>
[...Array(Math.floor((to - from) / step) + 1)].map((_, i) => from + i * step);
range(0, 9, 2);
//=> [0, 2, 4, 6, 8]
// can also assign range function as static method in Array class (but not recommended )
Array.range = (from, to, step) =>
[...Array(Math.floor((to - from) / step) + 1)].map((_, i) => from + i * step);
Array.range(2, 10, 2);
//=> [2, 4, 6, 8, 10]
Array.range(0, 10, 1);
//=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Array.range(2, 10, -1);
//=> []
Array.range(3, 0, -1);
//=> [3, 2, 1, 0]
As Iterators
class Range {
constructor(total = 0, step = 1, from = 0) {
this[Symbol.iterator] = function* () {
for (let i = 0; i < total; yield from + i++ * step) {}
};
}
}
[...new Range(5)]; // Five Elements
//=> [0, 1, 2, 3, 4]
[...new Range(5, 2)]; // Five Elements With Step 2
//=> [0, 2, 4, 6, 8]
[...new Range(5, -2, 10)]; // Five Elements With Step -2 From 10
//=>[10, 8, 6, 4, 2]
[...new Range(5, -2, -10)]; // Five Elements With Step -2 From -10
//=> [-10, -12, -14, -16, -18]
// Also works with for..of loop
for (i of new Range(5, -2, 10)) console.log(i);
// 10 8 6 4 2
As Generators Only
const Range = function* (total = 0, step = 1, from = 0) {
for (let i = 0; i < total; yield from + i++ * step) {}
};
Array.from(Range(5, -2, -10));
//=> [-10, -12, -14, -16, -18]
[...Range(5, -2, -10)]; // Five Elements With Step -2 From -10
//=> [-10, -12, -14, -16, -18]
// Also works with for..of loop
for (i of Range(5, -2, 10)) console.log(i);
// 10 8 6 4 2
// Lazy loaded way
const number0toInf = Range(Infinity);
number0toInf.next().value;
//=> 0
number0toInf.next().value;
//=> 1
// ...
带步长/增量的从到
using iteratorsclass Range2 {
constructor(to = 0, step = 1, from = 0) {
this[Symbol.iterator] = function* () {
let i = 0,
length = Math.floor((to - from) / step) + 1;
while (i < length) yield from + i++ * step;
};
}
}
[...new Range2(5)]; // First 5 Whole Numbers
//=> [0, 1, 2, 3, 4, 5]
[...new Range2(5, 2)]; // From 0 to 5 with step 2
//=> [0, 2, 4]
[...new Range2(5, -2, 10)]; // From 10 to 5 with step -2
//=> [10, 8, 6]
using Generators
const Range2 = function* (to = 0, step = 1, from = 0) {
let i = 0,
length = Math.floor((to - from) / step) + 1;
while (i < length) yield from + i++ * step;
};
[...Range2(5, -2, 10)]; // From 10 to 5 with step -2
//=> [10, 8, 6]
let even4to10 = Range2(10, 2, 4);
even4to10.next().value;
//=> 4
even4to10.next().value;
//=> 6
even4to10.next().value;
//=> 8
even4to10.next().value;
//=> 10
even4to10.next().value;
//=> undefined
对于字体
class _Array<T> extends Array<T> {
static range(from: number, to: number, step: number): number[] {
return Array.from(Array(Math.floor((to - from) / step) + 1)).map(
(v, k) => from + k * step
);
}
}
_Array.range(0, 9, 1);
我没有看到任何基于递归函数的解决方案(我自己也从未编写过递归函数),所以这里是我的尝试。
注意array.push(something)返回数组的新长度:
(a=[]).push(a.push(a.push(0))) // a = [0, 1, 2]
使用递归函数:
var a = (function f(s,e,a,n){return ((n?n:n=s)>e)?a:f(s,e,a?a:a=[],a.push(n)+s)})(start,end) // e.g., start = 1, end = 5
编辑:其他两种解决方案
var a = Object.keys(new Int8Array(6)).map(Number).slice(1)
and
var a = []
var i=setInterval(function(){a.length===5?clearInterval(i):a.push(a.length+1)})