How to find the largest odd number in an array in javascript

Implementation steps: 1. Use filter() to filter the array and return all odd elements. The syntax is "function f(v){if(v%2!=0){return true;}else{return false; }}var b=arr.filter(f);" will obtain an array containing all odd elements; 2. Use Math.max() and the expansion operator "..." to obtain the maximum value in the odd array, syntax "Math.max(...b)".

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

In javascript, you can use the filter() and Math.max() methods to find the largest odd number in an array.

Implementation steps:

Step 1: Use the filter() method to get all odd numbers

The filter() method can filter array elements and return elements that meet specified conditions. Just use

and if you want to get all the odd numbers, you just need to filter all the even numbers in the array and only return the technology.

Example: Return all odd numbers

var a = [2,3,4,5,6,7,8];
function f (value) {
	if (value % 2 != 0) {
		return true;
	}else{
		 return false;
	}
}
var b = a.filter(f);
console.log(b);

Output result:

As you can see, a value containing Array of all odd elements

Step 2: Use Math.max() method and spread operator...Get the maximum value in the odd array

Math.max() method can accept a series of numbers and return the largest number.

Note: The Math.max() method cannot directly accept an array as a parameter; if you want to use the Math.max() method to return the maximum value of the array, you need to use the expansion operator ...use together.

Expand operator... can expand the array elements and take them out one by one and pass them to the Math.max() method as parameters.

Example:

var a = [2,3,4,5,6,7,8];
function f (value) {
	if (value % 2 != 0) {
		return true;
	}else{
		 return false;
	}
}
var b = a.filter(f);
console.log(b);
var max = Math.max(...b);
console.log("数组的最大奇数为："+max);

Function description:

1, filter() method

The filter() method can return elements in the array that meet specified conditions. Just use

array.filter(function callbackfn(Value,index,array),thisValue)

function callbackfn(Value,index,array): a callback function, which cannot be omitted, and can accept up to three parameters:

• value: The value of the current array element, cannot be omitted.

• index: The numeric index of the current array element.

• array: The array object to which the current element belongs.

The return value is a new array containing all the values ​​for which the callback function returns true. If the callback function returns false for all elements of array , the length of the new array is 0.

2. Math.max() method

The Math.max() method returns the maximum number as an input parameter. If there are no parameters, it returns -Infinity.

Math.max(value1, value2, ... valueN ) ;

The following are the details of the parameters:

• value1, value2, ... valueN : Number.

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