Get Max Value From Array in JavaScript

Get Max Value From Array in JavaScript | The largest of the integers provided as input parameters, or -Infinity if there are none, are returned by the Math.max() function. We can use Math.max() function to get the largest value from the given array.

Parameters:-
value1, value2, …, valueN

There may be zero or more numbers, and the largest value will be chosen and returned.

Return value:- the most significant number provided. If any of the parameters is or is changed to a NaN value, NaN is returned. In the absence of any parameters, it returns -Infinity.

We always use max() as Math because it is a static method of Math. Instead of being a method of a Math object, we constructed, max() (Math is not a constructor).

Math.max.length is set to 2, which is a hazy indication that it can accommodate at least two parameters.

Syntax:-

• Math.max()
• Math.max(value0)
• Math.max(value0, value1)
• Math.max(value0, value1, …, valueN)

In JavaScript, find the index of the maximum value in an array. To find the maximum value’s index in an array:-

• To find the maximum value in the array, use the Math.max() method.
• To find the index of the maximum value, use the String.indexOf() method.
• The indexOf() method returns either -1 if the value cannot be found or the index of the value in the array.

Get Max Value From Array in JavaScript Using Math.max()

const arr = [22, 30, 194, 140, 165];
const max = Math.max(...arr);
console.log("Max value in the given array: " + max);

const index = arr.indexOf(max);
console.log("Index of max value: " + index);

Output:-

Max value in the given array: 194
Index of max value: 2

We utilized the Math.max() method to determine the maximum value in the array. We can’t just send an array to the Math.max() method; it requires multiple, comma-separated values as parameters.

const max = Math.max(2, 3, 4, 145, 16);
console.log(max);

Output:-

145

We unpacked the array’s values using the spread operator (…) before passing them as several comma-separated parameters to the Math.max() method.

const arr = [2, 34, 4, 14, 16];
const max = Math.max(...arr);
console.log("Max value: " + max);

const index = arr.indexOf(max);
console.log("index of max value: " + index);

Output:-

Max value: 34
index of max value: 1

If the array contains a maximum value more than once then the indexOf() method is going to return the index of the first occurrence of the max value.

const arr = [2, 34, 4, 14, 16, 34, 16];
const max = Math.max(...arr);
console.log("Max value: " + max);

const index = arr.indexOf(max);
console.log("index of max value: " + index);

Output:-

Max value: 34
index of max value: 1

Get Max Value From Array in JavaScript Using Loop

const numbers = [-2, 34, 4, -14, 16, 34, 16];
let maxValue = -Infinity;
for (let i = 0; i < numbers.length; i++) {
  if (maxValue < numbers[i]) {
    maxValue = numbers[i];
  }
}
console.log("Max value: " + maxValue);

Output:-

Max value: 34

Notice that the above two ways of finding max value from array in JavaScript using Loop or Math.max() only for the numeric arrays. Also see:- How to Find the Longest String in an Array in JavaScript

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