In this shot, we will be learning how to print a Left Triangle star (*) Pattern with the help of Javascript.
The Left Triangle pattern displays * in the form of the Left triangle, right-angled from the left-side, on the console.
Below is the shape that we will be printing using * in the console:
We have to use two for loops, where one will be a nested for loop. The outer loop will be used for the
let n = 5;for (let i = 1; i <= n; i++) {for (let j = 0; j < i; j++) {process.stdout.write("*");}console.log();}
In line 1, we take a number that is the height of the triangle or number of rows.
In line 3, we have our first for loop, which will iterate over the height of the triangle (that is 5 here).
In line 4, we have our nested for loop, which will iterate for less than the current row number.
For example,
row (n) = 3 will execute for j=0, j=1, and j=2. When j becomes equal to i (current row), it will terminate the for loop.
In line 5,
the standard method process.stdout.write() of JavaScript is used to print the *.
The number of times the nested for loop runs is equal to the number of stars it prints.
In line 7, we have used console.log() with null, as it will change to a new line. We can use process.stdout.write('\n') to change the line.
We have successfully completed the task to print * in the form that looks like a Left triangle. This is only one of the many logics that can be used to print the same pattern.