First, build an array with a 0|i length (it will floor the number)
Use the reduce method to loop through the built array. Use the a parameter, which is the response array (initialized as [] and updated at each iteration), and the l parameter which is the current index.
For each iteration, add to the a array an item which is described as follow : Build a l+1-long array, fill it with l+1 (hence, if we are at l=1, the built item will be equal to [2, 2]). Then, use the join method to convert it to a string ('22'in this case)
Finally, once the array is built, use the join method one last time to add line breaks between lines
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Well, here we go for some JS oneliner:
It works like this :
0|ilength (it will floor the number)reducemethod to loop through the built array. Use theaparameter, which is the response array (initialized as[]and updated at each iteration), and thelparameter which is the current index.aarray an item which is described as follow : Build al+1-long array, fill it withl+1(hence, if we are atl=1, the built item will be equal to[2, 2]). Then, use thejoinmethod to convert it to a string ('22'in this case)joinmethod one last time to add line breaks between lines