Create an array with same element repeated multiple times
arrays, javascript, repeat
Solution
You can do it like this:
function fillArray(value, len) {
if (len == 0) return [];
var a = [value];
while (a.length * 2 <= len) a = a.concat(a);
if (a.length < len) a = a.concat(a.slice(0, len - a.length));
return a;
}
It doubles the array in each iteration, so it can create a really large array with few iterations.
Note: You can also improve your function a lot by using `push` instead of `concat`, as `concat` will create a new array each iteration. Like this (shown just as an example of how you can work with arrays):
function fillArray(value, len) {
var arr = [];
for (var i = 0; i < len; i++) {
arr.push(value);
}
return arr;
}
Problem
In Python, where `[2]` is a list, the following code gives this output: ``` [2] * 5 # Outputs: [2,2,2,2,2] ``` Does there exist an easy way to do this with an array in JavaScript? I wrote the following function to do it, but is there something shorter or better? ``` var repeatelem = function(elem, n){ // returns an array with element elem repeated n times. var arr = []; for (var i = 0; i <= n; i++) { arr = arr.concat(elem); }; return arr; }; ```