The maximum and minimum values in the JavaScript array, and the javascript array.

The maximum and minimum values in the JavaScript array, and the javascript array.

Now, getting the maximum and minimum values in an array is getting more and more, so I have compiled a method for you to use. The Code is as follows. If you have any questions, contact me. Let's learn and make progress together.

Let's take a look at Example 1:

var numReg = /^-?[0-9]+.?[0-9]*$/Array.prototype.min = function() {  return this.reduce(function(preValue, curValue,index,array) {   if ( numReg.test(preValue) && numReg.test(curValue) ) {      return preValue > curValue ? curValue : preValue;   } else if ( numReg.test(preValue) ) {   return preValue;   } else if ( numReg.test(curValue) ) {   return curValue;   } else {   return 0;   }  })}Array.prototype.max = function() {  return this.reduce(function(preValue, curValue,index,array) {   if ( numReg.test(preValue) && numReg.test(curValue) ) {      return preValue < curValue ? curValue : preValue;   } else if ( numReg.test(preValue) ) {   return preValue;   } else if ( numReg.test(curValue) ) {   return curValue;   } else {   return 0;   }  })}

Example 2:

function getMaximin (arr,maximin) {  if (maximin == "max") {   return Math.max.apply(Math, arr);  }else if (maximin == "min") {   return Math.min.apply(Math, arr);  } }  var a = [3,2,4,2,10]  var b = [12,4,45,786,9,78]  alert("aMax:" + getMaximin(a,"max") + "---aMin:" + getMaximin(a,"min") + "---bMax:" + getMaximin(b,"max") + "---bMin:" + getMaximin(b,"min"))//aMax:10---aMin:2---bMax:786---bMin:4  function getMaximin (arr,maximin) { if (maximin == "max") {  return Math.max.apply(Math, arr); }else if (maximin == "min") {  return Math.min.apply(Math, arr); }} var a = [3,2,4,2,10] var b = [12,4,45,786,9,78] alert("aMax:" + getMaximin(a,"max") + "---aMin:" + getMaximin(a,"min") + "---bMax:" + getMaximin(b,"max") + "---bMin:" + getMaximin(b,"min"))//aMax:10---aMin:2---bMax:786---bMin:4

Let's look at two more methods.

Method 1:

// Minimum value Array. prototype. min = function () {var min = this [0]; var len = this. length; for (var I = 1; I <len; I ++) {if (this [I] <min) {min = this [I] ;}} return min;} // maximum value Array. prototype. max = function () {var max = this [0]; var len = this. length; for (var I = 1; I <len; I ++) {if (this [I]> max) {max = this [I] ;}} return max ;}

If you are introducing a class library for development, you are afraid that the class library has also implemented a prototype method of the same name. You can perform the cognominal judgment before generating the function:

if (typeof Array.prototype['max'] == 'undefined') { Array.prototype.max = function() { ... ...}}

Method 2:

The Math. max and Math. min methods can be used to quickly obtain the results. Apply allows a method to specify the call object and input parameters, and the input parameters are organized in arrays. Now, there is a method named Math. max. The called object is Math, which corresponds to multiple parameters.

Array.max = function( array ){ return Math.max.apply( Math, array );};Array.min = function( array ){ return Math.min.apply( Math, array );};

However, John Resig is a static method that makes them Math objects. It cannot be called using a chain that is a favorite of great gods. However, this method can be more streamlined. Don't forget that the Math object is also an object. We can use the literal number of objects to write it, saving several bits.

Array.prototype.max = function(){ return Math.max.apply({},this) } Array.prototype.min = function(){ return Math.min.apply({},this) } [1,2,3].max()// => 3 [1,2,3].min()// => 1