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

我会用。。。数组(N).keys()

var foo=[…Array(5).keys()].map(foo=>foo+1)console.log(foo)

其他回答

空数组和数组中只有数字的解决方案

const arrayOne=新数组(10);console.log(arrayOne);const arrayTwo=[…数组(10).keys()];console.log(arrayTwo);var arrayThree=Array.from(Array(10).keys());console.log(arrayThree);const arrayStartWithOne=Array.from(Array(10).keys(),item=>item+1);console.log(arrayStartWithOne)

使用ES2015/ES6排列运算符

[...Array(10)].map((_, i) => i + 1)

console.log([…数组(10)].map((_,i)=>i+1))

以下是摘要(在控制台中运行):

// setup:
var n = 10000000;
function* rangeIter(a, b) {
    for (let i = a; i <= b; ++i) yield i;
}
function range(n) { 
    let a = []
    for (; n--; a[n] = n);
    return a;
}
function sequence(max, step = 1) {
    return {
        [Symbol.iterator]: function* () {
            for (let i = 1; i <= max; i += step) yield i
        }
    }
}

var t0, t1, arr;
// tests
t0 = performance.now();
arr = Array.from({ length: n }, (a, i) => 1)
t1 = performance.now();
console.log("Array.from({ length: n }, (a, i) => 1) Took " + (t1 - t0) + " milliseconds.");

t0 = performance.now();
arr = range(n);
t1 = performance.now();
console.log("range(n) Took " + (t1 - t0) + " milliseconds.");

t0 = performance.now();
arr = Array.from(rangeIter(0, n));
t1 = performance.now();
console.log("Array.from(rangeIter(0, n)) Took " + (t1 - t0) + " milliseconds.");

t0 = performance.now();
arr = [...rangeIter(0, n)];
t1 = performance.now();
console.log("[...rangeIter(0, n)] Took " + (t1 - t0) + " milliseconds.");

t0 = performance.now();
arr = Array.from(sequence(n));
t1 = performance.now();
console.log("Array.from(sequence(n)) Took " + (t1 - t0) + " milliseconds.");

t0 = performance.now();
arr = [...sequence(n)];
t1 = performance.now();
console.log("[...sequence(n)] Took " + (t1 - t0) + " milliseconds.");

t0 = performance.now();
arr = Array(n).fill(0).map(Number.call, Number);
t1 = performance.now();
console.log("Array(n).fill(0).map(Number.call, Number) Took " + (t1 - t0) + " milliseconds.");

t0 = performance.now();
arr = Array.from(Array(n).keys());
t1 = performance.now();
console.log("Array.from(Array(n).keys()) Took " + (t1 - t0) + " milliseconds.");

t0 = performance.now();
arr = [...Array(n).keys()];
t1 = performance.now();
console.log("[...Array(n).keys()] Took " + (t1 - t0) + " milliseconds.");

最快的是Array(n).fill(0).map(Number.call,Number),第二个是[…Array(n).keys()]

但是。。。rangeIter的方式非常方便(可以内联),速度快,功能更强大

function range(start, end) {
    var foo = [];
    for (var i = start; i <= end; i++) {
        foo.push(i);
    }
    return foo;
}

然后由调用

var foo = range(1, 5);

在Javascript中没有内置的方法来实现这一点,但如果您需要多次执行,则可以创建一个非常有效的实用程序函数。

编辑:在我看来,以下是一个更好的范围函数。也许只是因为我对LINQ有偏见,但我认为它在更多情况下更有用。您的里程数可能有所不同。

function range(start, count) {
    if(arguments.length == 1) {
        count = start;
        start = 0;
    }

    var foo = [];
    for (var i = 0; i < count; i++) {
        foo.push(start + i);
    }
    return foo;
}

对以上内容进行改进:

var range = function (n) {
  return Array(n).join().split(',').map(function(e, i) { return i; });
}  

可以获得以下选项:

1) Array.init设置为值v

var arrayInitTo = function (n,v) {
  return Array(n).join().split(',').map(function() { return v; });
}; 

2) 获得反向范围:

var rangeRev = function (n) {
  return Array(n).join().split(',').map(function() { return n--; });
};