// Step 159:

function concatenate() {

var beginning = "This sentence ";

var middle = "is actually 3 strings that were";

var end = " concatenated together, into one.";

var result = beginning.concat(middle, end); // The concate method, combining all three strings into one

document.getElementById("Concatenate").innerHTML = result;

}

// Step 161:

function slice() {

var string = document.getElementById("PreSlice").innerHTML;

document.getElementById("PostSlice").innerHTML = string.slice(12, 20); // The slice method, beginning at index 12 and slicing until index 19

}

// Step 162:

// Learned you can't assign "document.getElementById(id's name).innerHTML or just "document.getElementById(id's name)" to a variable

function toUpperCase() {

var string = document.getElementById("RegularCase").innerHTML;

document.getElementById("UpperCase").innerHTML = string.toUpperCase(); // string's letters are converted into upper case

}

function search() {

var findThis = document.getElementById("ChosenWord").value.toUpperCase(); // the word being searched for is converted into upper case

var itsIndex = document.getElementById("RegularCase").innerHTML.toUpperCase().search(findThis); // Since #UpperCase may be empty, go to its source (#RegularCase) and capitalize IT instead, then perform the search; assigning result to a variable

if (itsIndex == -1) {

document.getElementById("Position").innerHTML = "<strong>What you typed wasn't found!</strong>";

} else {

document.getElementById("Position").innerHTML = itsIndex;

}

}

// Step 164:

function toAString() {

var startingText = document.getElementById("ChosenNumber164").value;

var startingNumber = parseInt(startingText); // User's text converted into type==number

console.log(startingNumber);

if (isNaN(startingNumber)) {

// Is User's input something other than 0-9 and is returning -1?!?

document.getElementById("NumberToString").innerHTML =

"<strong>Please do not enter text, or leave blank; use digits (0-9) only</strong>";

} else {

document.getElementById("NumberToString").innerHTML = startingNumber.toString();

}

}

// Step 166:

function toRandomNumr() {

var chosenNumr = document.getElementById("ChosenNumber").value; // User's input;

if (chosenNumr > 58) {

// ERROR - they chose too high

document.getElementById("RandomNumber").innerHTML = "Absolutely not. Please keep your number choices below 59";

} else if (chosenNumr <= 2) {

// ERROR - they chose too low

document.getElementById(

"RandomNumber",

).innerHTML = `This works best if you choose a number <strong>greater than 2</strong>.`;

} else {

var Exp = chosenNumr * 3; // Max chosenNumr is 58, so max exponent is 174, < Infinity's 1e+308

var randomNumr = Math.pow(chosenNumr, Exp); // What the toPrecision() method will be applied to

document.getElementById(

"RandomNumber",

).innerHTML = `The random number <strong>${randomNumr}</strong> has been reformatted to only show <strong>${chosenNumr}</strong> digits, becoming...`;

/*

document.getElementById("Button166").onClick = precision(chosenNumr, randomNumr); // Failed attempt at reassigning the "precision" function when Button166 was clicked a 2nd time; (side-effect: passed parameters outside their local scope)

}

}

function precision(chosenNumr, randomNumr) { */

var preciseNumr = randomNumr.toPrecision(chosenNumr); // What really matters...

document.getElementById("PreciseNumber").innerHTML = `<strong>${preciseNumr}</strong>`;

document.getElementById("Button167").onClick = toFixed_Method(chosenNumr, randomNumr); // Using Button167 to pass on next function's arguments (instead of repeating the "random number" code); clicking Button167 breaks this chain

}

}

// Step 167:

function toFixed_Method(chosenNumr, randomNumr) {

var fixedNumr = randomNumr.toFixed(chosenNumr); // What really matters...

document.getElementById(

"FixedNumber",

).innerHTML = `Here, your random number (from above - <strong>${randomNumr}</strong>), has been rounded to a "fixed" number of decimals (<strong>${chosenNumr}</strong>), becoming...: <br> <strong>${fixedNumr}</strong>`;

}

function valueOf_Method() {

var RandomNumber = 123456789;

document.getElementById(

"ValueOfText",

).innerHTML = `All of these numbers were assigned to their own <em>variable</em>, giving each variable a specific <em>value</em>.<br>Displaying any of those values can be done with the "valueOf" method, for example:<br><br> if (RandomNumber = "123,456,789"), then<br> {RandomNumber.<strong>valueOf()</strong> = ${RandomNumber.valueOf()}}`;

}