将数字转换为 space 的数量

Question

我有一个数字，希望它生成一个对应 space

的字符串

例如：

var NumberOfSpace = 3;

// This will result in a string with 3 empty space
// the result will be "   "
var space = convertToSpace(NumberOfSpace);

Answer 1

这是一个convertToSpace函数

var convertToSpace = function (spaces) {
  var string = "";
  for (var i = 0; i < spaces; i++) {
    string += " ";
  }
  return string;
}

Answer 2

您可以简单地使用 String.prototype.repeat 方法：

" ".repeat(3);

_{A polyfill for older browsers.}

Answer 3

使用Array#fill and Array#reduce

The fill() method fills all the elements of an array from a start index to an end index with a static value.

The reduce() method applies a function against an accumulator and each value of the array (from left-to-right) to reduce it to a single value.

var NumberOfSpace = 3;

function convertToSpace(param) {
  return new Array(param).fill(' ').reduce(function(a, b) {
    return a + b;
  });
}
var space = convertToSpace(NumberOfSpace);
console.log(space);

Answer 4

一个简洁的选项：

function convertToSpace(n) {
  return new Array(n + 1).join(' ')
}

将数字转换为 space 的数量

Convert number into amount of space

javascript

math

ascii