*
**
***
****
*****
******
*******
********
*********
**********
How do I do this with nested repeats using% of JavaScript, or in VisuAlg?
For you to have an idea of what the code would look like:
for(var linha = 0; linha < 10; linha = linha++) {
for(var coluna = 0; coluna < 10; coluna = coluna++) { Document.write("*");
}
Document. Write("");
}
So, but I can not think of anything to give that effect using two loop
If you want to do this with JavaScript you can do this:
var string = [];
for (var i = 0; i < 20; i++) {
var stars = Array.apply(null, Array(i)).map(function(){return '*'});
string.push(stars.join(''));
}
document.body.innerHTML = string.join('<br>'); This creates 20 rows within an array and then you can join a string to HTML with <br> between each row for the line break.
A more modern version of JavaScript might be:
const string = [...Array(20)].map(
(u, i) => [...Array(i)].map(() => '*').join('')
);
document.body.innerHTML = string.join('<br>'); Or using the new method .repeat as indicated in the other answer :
const string = [...Array(20)].map((u, i) => '*'.repeat(i));
document.body.innerHTML = string.join('<br>');After reading the comment you wrote , I leave a version also with 2 for loops, if you prefer to use this:
var linhas = 20;
var texto = []
for (var i = 0; i < linhas; i++) {
var string = '';
for (var j = 1; j <= i; j++) {
string += '*';
}
texto.push(string);
}
document.body.innerHTML = texto.join('<br>'); You can use String.repeat to repeat a sequence according to the current iteration of loop :
for (var contagem = 1; contagem < 11; contagem++) {
console.log("*".repeat(contagem));
}To do the same on two nested loops, do so:
var linhas = 11;
for (var linha = 1; linha < linhas; linha++) { // 1 até 11
for (var coluna = linha; ; coluna++) { // De 1 até 11, porém sem condição
console.log("*".repeat(coluna));
break; // Interrompe o segundo loop
}
} The first for will repeat the code until the current iteration reaches the value of linhas . The second for will only follow the first because a condition was not specified to repeat your code.