Oppgave 1

Lag en array med noen selvvalgte tilfeldige tall, gjør så følgende med denne:

Resultat

Skriv ut arrayen

Skriv ut arrayen baklengs

Skriv ut annethvert tall i arrayen

Skriv ut de tallene som er mindre enn 10 i arrayen

Skriv ut alle partall i arrayen

Finn summen av arrayen

Finn antall elementer i arrayen

Finn gjennomsnittet av arrayen

Finn summen av partall i arrayen

Finn minste element

Finn ut om en liste inneholder en bestemt verdi.

Finn ut hvor mange forekomster det er av en bestemt verdi.

Koden

JavaScript

                
window.onload = ready;

function ready() {
    runArrayFunctions();
}

function runArrayFunctions() {
    // Lag en array med 10 tall
    var array = [];
    var output = document.getElementById("o1-array");
    
    output.innerHTML += "Array = [";
    
    for (var i = 0; i < 10; i++) {
        array[i] = Math.round(Math.random() * 10); // Høyeste verdi er 10
    }

    output.innerHTML += array.join(", ");
    output.innerHTML += "]";

    document.getElementById("o1-output-1").value = arrayWrite(array);
    document.getElementById("o1-output-2").value = arrayBackwards(array);
    document.getElementById("o1-output-3").value = arrayEveryOther(array);
    document.getElementById("o1-output-4").value = arrayLessThan10(array);
    document.getElementById("o1-output-5").value = arrayEven(array);
    document.getElementById("o1-output-6").value = arraySum(array);
    document.getElementById("o1-output-7").value = arrayLength(array);
    document.getElementById("o1-output-8").value = arrayAverage(array);
    document.getElementById("o1-output-8").value = arrayAverage(array);
    document.getElementById("o1-output-9").value = arraySumEven(array);
    document.getElementById("o1-output-10").value = arrayFindSmallest(array);

    var o1Input11 = document.getElementById("o1-input-11");
    var o1Output11 = document.getElementById("o1-output-11");
    o1Input11.value = array[Math.floor(Math.random()*array.length)]
    o1Output11.value = arraySearch(array, o1Input11.value);

    o1Input11.oninput = function() {
        o1Output11.value = arraySearch(array, o1Input11.value);
    }

    var o1Input12 = document.getElementById("o1-input-12");
    var o1Output12 = document.getElementById("o1-output-12");
    o1Input12.value = array[Math.floor(Math.random()*array.length)]
    o1Output12.value = arraySearchCount(array, o1Input12.value);

    o1Input12.oninput = function() {
        o1Output12.value = arraySearchCount(array, o1Input12.value);
    }
}

// Skriv ut array
function arrayWrite(array) {
    return array.join(", ");
}

// Skriv ut array baklengs
function arrayBackwards(array) {
    var tmpArray = [];
    for (var i = array.length-1; i >= 0; i--) {
        tmpArray.push(array[i]);
    }

    return tmpArray.join(", ");
}

// Skriv ut annethvert tall i array
function arrayEveryOther(array) {
    var tmpArray = [];
    for (var i = 0; i < array.length; i++) {
        if (i % 2 ===0) {
            tmpArray.push(array[i]);
        }
    }

    return tmpArray.join(", ");
}

// Skriv ut tall mindre enn 10 i array
function arrayLessThan10(array) {
    var tmpArray = [];
    for (var i = 0; i < array.length; i++) {
        if (array[i] < 10) {
            tmpArray.push(array[i]);
        }
    }

    if (tmpArray.length != 0) {
        return tmpArray.join(", ");
    } else {
        return "Ingen av tallene er mindre enn 10";
    }
}

// Skriv ut partall i array
function arrayEven(array) {
    var tmpArray = [];
    for (var i = 0; i < array.length; i++) {
        if (array[i] % 2 ===0) {
            tmpArray.push(array[i]);
        }
    }

    return tmpArray.join(", ");
}

// Skriv ut summen av array
function arraySum(array) {
    var tmpString = "";
    for (var i = 0; i < array.length; i++) {
        tmpString = +tmpString + array[i];
    }

    return tmpString;
}

// Skriv ut antall elementer i array
function arrayLength(array) {
    return array.length;
}

// Skriv ut gjennomsnittet av tellene i array
function arrayAverage(array) {
    var tmpString = arraySum(array) / array.length;

    // Sjekk om tallet er float
    if (tmpString % 1 !== 0) {
        tmpString += " (Avrundet: " + Math.round(tmpString) + ")";
    }

    return tmpString;
}

// Summer partall
function arraySumEven(array) {
    var tmpString = "";
    for (var i = 0; i < array.length; i++) {
        if (array[i] % 2 ===0) {
            tmpString = +tmpString + array[i];
        }
    }

    return tmpString;
}

// Finn minste
function arrayFindSmallest(array) {
    var tmpString = array[0];
    for (var i = 0; i < array.length; i++) {
        if (array[i] < tmpString) {
            tmpString = array[i];
        }
    }

    return tmpString;
}

// Find value value
function arrayFindSmallest(array) {
    var tmpString = array[0];
    for (var i = 0; i < array.length; i++) {
        if (array[i] < tmpString) {
            tmpString = array[i];
        }
    }

    return tmpString;
}

function arraySearch(array, value) {
    if (value) {
        if (array.indexOf(+value) > -1) {
            return "Fant " + value;
        } else {
            return "Fant ikke " + value;
        }
    } else {
        return "Skriv inn et gyldig tall til venstre..."
    }
}

function arraySearchCount(array, value) {
    var found = 0;

    if (value) {
        for (var i = 0; i < array.length; i++) {
            if (array[i] == value) {
                found++;
            }
        }

        return "Fant " + found + " forekomster av " + value;
    } else {
        return "Skriv inn et gyldig tall til venstre..."
    }
}

HTML

                
<pre class="language-javascript"><code id="o1-array"></code></pre>
<section>
    <h3>Skriv ut arrayen</h3>
    <div class="row input-field">
        <input type="text" id="o1-output-1" class="col s12" readonly>
    </div>
</section>
<section>
    <h3>Skriv ut arrayen baklengs</h3>
    <div class="row input-field">
        <input type="text" id="o1-output-2" class="col s12" readonly>
    </div>
</section>
<section>
    <h3>Skriv ut annethvert tall i arrayen</h3>
    <div class="row input-field">
        <input type="text" id="o1-output-3" class="col s12" readonly>
    </div>
</section>
<section>
    <h3>Skriv ut de tallene som er mindre enn 10 i arrayen</h3>
    <div class="row input-field">
        <input type="text" id="o1-output-4" class="col s12" readonly>
    </div>
</section>
<section>
    <h3>Skriv ut alle partall i arrayen</h3>
    <div class="row input-field">
        <input type="text" id="o1-output-5" class="col s12" readonly>
    </div>
</section>
<section>
    <h3>Finn summen av arrayen</h3>
    <div class="row input-field">
        <input type="text" id="o1-output-6" class="col s12" readonly>
    </div>
</section>
<section>
    <h3>Finn antall elementer i arrayen</h3>
    <div class="row input-field">
        <input type="text" id="o1-output-7" class="col s12" readonly>
    </div>
</section>
<section>
    <h3>Finn gjennomsnittet av arrayen</h3>
    <div class="row input-field">
        <input type="text" id="o1-output-8" class="col s12" readonly>
    </div>
</section>
<section>
    <h3>Finn summen av partall i arrayen</h3>
    <div class="row input-field">
        <input type="text" id="o1-output-9" class="col s12" readonly>
    </div>
</section>
<section>
    <h3>Finn minste element</h3>
    <div class="row input-field">
        <input type="text" id="o1-output-10" class="col s12" readonly>
    </div>
</section>
<section>
    <h3>Finn ut om en liste inneholder en bestemt verdi.</h3>
    <div class="row input-field">
        <input id="o1-input-11" type="number" class="col s4" placeholder="Skriv inn et tall" min="0" max="10">
        <input id="o1-output-11" type="text" class="col s8" readonly>
    </div>
</section>
<section>
    <h3>Finn ut hvor mange forekomster det er av en bestemt verdi.</h3>
    <div class="row input-field">
        <input id="o1-input-12" type="number" class="col s4" placeholder="Skriv inn et tall" min="0" max="10">
        <input id="o1-output-12" type="text" class="col s8" readonly>
    </div>
</section>