I found on this link how to create arrays with a chosen number of zeros. Most efficient way to create a zero filled JavaScript array?
But my question is, imagine i already have a array
var a = ['hihi','haha']
how can i add 12 zeros after my two first elements ? So that it becomes :
a = ['hihi','haha',0,0,0,0,0,0,0,0,0,0,0,0];
of course I could go for a
for(var i = 0; i < 12, i++){
a.push(0);
}
but is there a one line method ? something like
a.push(6*[0]);
You can use Array.prototype.concat() and Array.prototype.fill()
12 and fill 0 by using Array.prototype.fill()Array.prototype.concat()var a = ['hihi', 'haha'].concat(Array(12).fill(0));
document.write('<pre>' + JSON.stringify(a, null, 3) + '</pre>');You could for instance use a solution from the answer you link to create an array of twelve zeroes, and then use the Array.prototype.concat function to create the array you need.
var zeroes = Array.apply(null, Array(12)).map(Number.prototype.valueOf, 0);
var laughters = ['hihi', 'haha'];
var combined = laughters.concat(zeroes);
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.
In short, take your array and perform a concat with the answer you mentioned.
var a = ['hihi','haha'].concat(Array.apply(null, Array(12)).map(Number.prototype.valueOf,0);)
Must de 0 be an int or a string? And why do you want to add 12 zeros? What do you have tried so far?
Just an easy sample,
var a = ['hi', 'ha'];
for(var i = 0; 14 > a.length; i++){
a.push(0);
}
