In JavaScript, it is not possible to retrieve the maximum or minimum value of an array

Question

In JavaScript, it is not possible to retrieve the maximum or minimum value of an array

Hey there! I'm having some trouble finding the minimum and maximum values in an array. Can you help me figure out what's going on with my code?

    var repeated, studentsArray = [], marksArray = [];
while (repeated !== 'n' && repeated !== 'N'){
    studentsArray.push(prompt("Enter Student Name: "));
    marksArray.push(parseInt (prompt("Enter Student mark: ")));
    repeated = prompt ("Do you want to enter another student: y/n");
}  

function findMinimum (marksArray){
    var minVal = Number.MAX_VALUE;
    for(var i = 0; i < marksArray.length; i++){
       if(Number(marksArray[i]) < minVal)
           minVal = Number(marksArray[i]); 
    }
    return marksArray;
}
var smallestValue = findMinimum(marksArray);

function findMaximum (marksArray){
    var maxVal = Number.MAX_VALUE;
    for(var i = 0; i > marksArray.length; i++){
       if(Number(marksArray[i]) < maxVal)
           maxVal = Number(marksArray[i]); 
    }
    return marksArray;
}
var largestValue = findMaximum(marksArray);

    document.write(largestValue);

javascript arrays max minimum

Answer 1

Answer №1

If you want to customize the behavior of JavaScript's Array type, you could do so by adding custom methods like this:

Array.prototype.smallest = function(comparator) {

    if (this.length === 0) return null;
    if (this.length === 1) return this[0];

    comparator = (comparator || Math.min);

    var result = this[0];
    for (var i = 1; i < this.length; i++)
        result = comparator(this[i], v);  

    return result;
}

Array.prototype.largest = function(comparator) {

    if (this.length === 0) return null;
    if (this.length === 1) return this[0];

    comparator = (comparator || Math.max);

    var result = this[0];
    for (var i = 1; i < this.length; i++)
        result = comparator(this[i], v);    

    return result;
}

You can then use these custom methods as follows:

var smallestValue = yourArray.smallest();
var largestValue = yourArray.largest();

Check out the example on jsbin: http://jsbin.com/yoyecono/1/edit

Answer 2

If you want to customize the behavior of JavaScript's Array type, you could do so by adding custom methods like this:

Array.prototype.smallest = function(comparator) {

    if (this.length === 0) return null;
    if (this.length === 1) return this[0];

    comparator = (comparator || Math.min);

    var result = this[0];
    for (var i = 1; i < this.length; i++)
        result = comparator(this[i], v);  

    return result;
}

Array.prototype.largest = function(comparator) {

    if (this.length === 0) return null;
    if (this.length === 1) return this[0];

    comparator = (comparator || Math.max);

    var result = this[0];
    for (var i = 1; i < this.length; i++)
        result = comparator(this[i], v);    

    return result;
}

You can then use these custom methods as follows:

var smallestValue = yourArray.smallest();
var largestValue = yourArray.largest();

Check out the example on jsbin: http://jsbin.com/yoyecono/1/edit

In JavaScript, it is not possible to retrieve the maximum or minimum value of an array

Answer №1

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