In python3x I'm using a simple code:

for i in range(1, 10):
    print(i)

I tried using Array function on NodeJS/JavaScript:

const LIST = [];
const Range = Array(10).fill("0, 10", 0, 10)
LIST.push(Range);

console.log(LIST);

But it seems it just gonna give output:

[
  [
    '0, 10', '0, 10',
    '0, 10', '0, 10',
    '0, 10', '0, 10',
    '0, 10', '0, 10',
    '0, 10', '0, 10'
  ]
]

How do I make it gives output from 1 to 10?

CodePudding user response：

Why... not just use a plain for loop?

for(let i = 1; i < 10; i  ) {
  console.log(i);
}

CodePudding user response：

Array() fills the array with nothing but gives it a certain length, so filling it with null makes it [null, null, ...]. Mapping the array is similar to mapping in python, you loop through each item in the array and return the current index 1. That creates an array [1, 2, 3, 4 ..., 10]

const Range = Array(10).fill(null).map((_, i) => i   1);

console.log(Range);

CodePudding user response：

The equivalent to for i in range(x, y) is for (let i = x; i < y; i ):

for (let i = 1; i < 10; i  ) {
  console.log(i)
}

Output is 1, 2, 3, 4, 5, 6, 7, 8, 9 just as it was in your Python example.

See docs.

CodePudding user response：

In short, what you're describing is an array where the index is also the value. That can be achieved with this little line:

const array = Array(10).fill(0).map((zero, index) => index)

console.log(array) // [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ]

In short, it does this:

1. Array(10): Make an array of length 10, which is empty.
2. .fill(0): Fill the array with zeros (could be anything).
3. .map((z, i) => i): Replace each value (zero) with its index (0, 1, 2...)

CodePudding user response：

How about:

[...Array(10).keys()].map(x => x   1);

Explanation:

• Array(10) gives an array of length 10.
• .keys() gives the indices viz 0, 1, 2, ... 9.
• .map(...) increments each index by 1, thus giving 1, 2, 3, ... 10

Try it out:

console.log([...Array(10).keys()].map(x => x   1))