Help you understand this?

push-to-array.js

text = "Kanye says: This string has the name Kenny embeded in it\n the following function should find it.";

var myName = "Kenny"; //String to find
var hits = []; // Empty array to put it into
var altHits = []; // Empty list for alternative hits

// Look for "K" in the text
/*
    Loop over numbers from `0` to `text.length` 
    so you can access the single characters of `text` 
    via `text[i]` for the `i+1`th character
    (strings are loopable like arrays / lists)
*/
for(var i = 0; i < text.length; i++) { // No clue
	console.log("inside 1st for-loop, current index i="+i+" & and current character text[i]="+text[i]);
    /*
        Check if the current character `text[i]` is equal to K, 
        if yes do further stuff
        text[0] is 1st character (K), text[1] is 2nd character (a), etc.
    */
	if (text[i] === "K") { // I guess telling i to look for K???
	console.log("    inside if-condition, because character text[i]===K");
		// If we find it, add characters up to
		// the length of my name to the array
		/*
		    Start a new loop at the position of the found "K" `i` and name the running index `j`, 
		    the loop runs `myName.length` times, so in this case 5 times
		*/
		for(var j = i; j < (myName.length + i); j++) { // Where did j come from?
		console.log("        inside 2nd for-loop, current index j="+j+" and current character text[j]="+text[j]);
		    /*
		        Problems: 
		         1. This code also adds "Kanye" (added at top) and any list of characters starting with "K", 
		            there should be a check if the following characters actually match "Kenny"
		         2. The resulting array will look like [ "K", "a", "n", "y", "e", "K", "e", "n", "n", "y" ], 
		            I'd expect it should actually be ["Kanye", "Kenny"]
		    */
			hits.push(text[j]); // push found text to array but where did j come from?
			console.log("        after adding the current character to hits array, it looks like this: hits="+hits);
		}
		/* 
		    This is my alternative to the above for loop which uses the
		    [substr method](https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/String/substring)
		*/
		if (text.substr(i, myName.length) === myName) {
		    altHits.push(text.substr(i, myName.length));
		}
	}
}

if (hits.length === 0) {  // if nothing was found.
	console.log("Your name wasn't found!");
} else {
	console.log(hits);
}

if (altHits.length === 0) {  // if nothing was found.
	console.log("Your name wasn't found!");
} else {
	console.log(altHits);
}

resulting-output.txt

inside 1st for-loop, current index i=0 & and current character text[i]=K
    inside if-condition, because character text[i]===K
        inside 2nd for-loop, current index j=0 and current character text[j]=K
        after adding the current character to hits array, it looks like this: hits=K
        inside 2nd for-loop, current index j=1 and current character text[j]=a
        after adding the current character to hits array, it looks like this: hits=K,a
        inside 2nd for-loop, current index j=2 and current character text[j]=n
        after adding the current character to hits array, it looks like this: hits=K,a,n
        inside 2nd for-loop, current index j=3 and current character text[j]=y
        after adding the current character to hits array, it looks like this: hits=K,a,n,y
        inside 2nd for-loop, current index j=4 and current character text[j]=e
        after adding the current character to hits array, it looks like this: hits=K,a,n,y,e
inside 1st for-loop, current index i=1 & and current character text[i]=a
inside 1st for-loop, current index i=2 & and current character text[i]=n
inside 1st for-loop, current index i=3 & and current character text[i]=y
inside 1st for-loop, current index i=4 & and current character text[i]=e
inside 1st for-loop, current index i=5 & and current character text[i]= 
inside 1st for-loop, current index i=6 & and current character text[i]=s
inside 1st for-loop, current index i=7 & and current character text[i]=a
inside 1st for-loop, current index i=8 & and current character text[i]=y
inside 1st for-loop, current index i=9 & and current character text[i]=s
inside 1st for-loop, current index i=10 & and current character text[i]=:
inside 1st for-loop, current index i=11 & and current character text[i]= 
inside 1st for-loop, current index i=12 & and current character text[i]=T
inside 1st for-loop, current index i=13 & and current character text[i]=h
inside 1st for-loop, current index i=14 & and current character text[i]=i
inside 1st for-loop, current index i=15 & and current character text[i]=s
inside 1st for-loop, current index i=16 & and current character text[i]= 
inside 1st for-loop, current index i=17 & and current character text[i]=s
inside 1st for-loop, current index i=18 & and current character text[i]=t
inside 1st for-loop, current index i=19 & and current character text[i]=r
inside 1st for-loop, current index i=20 & and current character text[i]=i
inside 1st for-loop, current index i=21 & and current character text[i]=n
inside 1st for-loop, current index i=22 & and current character text[i]=g
inside 1st for-loop, current index i=23 & and current character text[i]= 
inside 1st for-loop, current index i=24 & and current character text[i]=h
inside 1st for-loop, current index i=25 & and current character text[i]=a
inside 1st for-loop, current index i=26 & and current character text[i]=s
inside 1st for-loop, current index i=27 & and current character text[i]= 
inside 1st for-loop, current index i=28 & and current character text[i]=t
inside 1st for-loop, current index i=29 & and current character text[i]=h
inside 1st for-loop, current index i=30 & and current character text[i]=e
inside 1st for-loop, current index i=31 & and current character text[i]= 
inside 1st for-loop, current index i=32 & and current character text[i]=n
inside 1st for-loop, current index i=33 & and current character text[i]=a
inside 1st for-loop, current index i=34 & and current character text[i]=m
inside 1st for-loop, current index i=35 & and current character text[i]=e
inside 1st for-loop, current index i=36 & and current character text[i]= 
inside 1st for-loop, current index i=37 & and current character text[i]=K
    inside if-condition, because character text[i]===K
        inside 2nd for-loop, current index j=37 and current character text[j]=K
        after adding the current character to hits array, it looks like this: hits=K,a,n,y,e,K
        inside 2nd for-loop, current index j=38 and current character text[j]=e
        after adding the current character to hits array, it looks like this: hits=K,a,n,y,e,K,e
        inside 2nd for-loop, current index j=39 and current character text[j]=n
        after adding the current character to hits array, it looks like this: hits=K,a,n,y,e,K,e,n
        inside 2nd for-loop, current index j=40 and current character text[j]=n
        after adding the current character to hits array, it looks like this: hits=K,a,n,y,e,K,e,n,n
        inside 2nd for-loop, current index j=41 and current character text[j]=y
        after adding the current character to hits array, it looks like this: hits=K,a,n,y,e,K,e,n,n,y
inside 1st for-loop, current index i=38 & and current character text[i]=e
inside 1st for-loop, current index i=39 & and current character text[i]=n
inside 1st for-loop, current index i=40 & and current character text[i]=n
inside 1st for-loop, current index i=41 & and current character text[i]=y
inside 1st for-loop, current index i=42 & and current character text[i]= 
inside 1st for-loop, current index i=43 & and current character text[i]=e
inside 1st for-loop, current index i=44 & and current character text[i]=m
inside 1st for-loop, current index i=45 & and current character text[i]=b
inside 1st for-loop, current index i=46 & and current character text[i]=e
inside 1st for-loop, current index i=47 & and current character text[i]=d
inside 1st for-loop, current index i=48 & and current character text[i]=e
inside 1st for-loop, current index i=49 & and current character text[i]=d
inside 1st for-loop, current index i=50 & and current character text[i]= 
inside 1st for-loop, current index i=51 & and current character text[i]=i
inside 1st for-loop, current index i=52 & and current character text[i]=n
inside 1st for-loop, current index i=53 & and current character text[i]= 
inside 1st for-loop, current index i=54 & and current character text[i]=i
inside 1st for-loop, current index i=55 & and current character text[i]=t
inside 1st for-loop, current index i=56 & and current character text[i]=

inside 1st for-loop, current index i=57 & and current character text[i]= 
inside 1st for-loop, current index i=58 & and current character text[i]=t
inside 1st for-loop, current index i=59 & and current character text[i]=h
inside 1st for-loop, current index i=60 & and current character text[i]=e
inside 1st for-loop, current index i=61 & and current character text[i]= 
inside 1st for-loop, current index i=62 & and current character text[i]=f
inside 1st for-loop, current index i=63 & and current character text[i]=o
inside 1st for-loop, current index i=64 & and current character text[i]=l
inside 1st for-loop, current index i=65 & and current character text[i]=l
inside 1st for-loop, current index i=66 & and current character text[i]=o
inside 1st for-loop, current index i=67 & and current character text[i]=w
inside 1st for-loop, current index i=68 & and current character text[i]=i
inside 1st for-loop, current index i=69 & and current character text[i]=n
inside 1st for-loop, current index i=70 & and current character text[i]=g
inside 1st for-loop, current index i=71 & and current character text[i]= 
inside 1st for-loop, current index i=72 & and current character text[i]=f
inside 1st for-loop, current index i=73 & and current character text[i]=u
inside 1st for-loop, current index i=74 & and current character text[i]=n
inside 1st for-loop, current index i=75 & and current character text[i]=c
inside 1st for-loop, current index i=76 & and current character text[i]=t
inside 1st for-loop, current index i=77 & and current character text[i]=i
inside 1st for-loop, current index i=78 & and current character text[i]=o
inside 1st for-loop, current index i=79 & and current character text[i]=n
inside 1st for-loop, current index i=80 & and current character text[i]= 
inside 1st for-loop, current index i=81 & and current character text[i]=s
inside 1st for-loop, current index i=82 & and current character text[i]=h
inside 1st for-loop, current index i=83 & and current character text[i]=o
inside 1st for-loop, current index i=84 & and current character text[i]=u
inside 1st for-loop, current index i=85 & and current character text[i]=l
inside 1st for-loop, current index i=86 & and current character text[i]=d
inside 1st for-loop, current index i=87 & and current character text[i]= 
inside 1st for-loop, current index i=88 & and current character text[i]=f
inside 1st for-loop, current index i=89 & and current character text[i]=i
inside 1st for-loop, current index i=90 & and current character text[i]=n
inside 1st for-loop, current index i=91 & and current character text[i]=d
inside 1st for-loop, current index i=92 & and current character text[i]= 
inside 1st for-loop, current index i=93 & and current character text[i]=i
inside 1st for-loop, current index i=94 & and current character text[i]=t
inside 1st for-loop, current index i=95 & and current character text[i]=.
Array [ "K", "a", "n", "y", "e", "K", "e", "n", "n", "y" ]
Array [ "Kenny" ]