Shulou(Shulou.com)06/03 Report--

In this issue, the editor will bring you about the role of es6 some methods. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

The es6 some () method is used to detect whether there are elements in the array that meet the specified conditions. If there is, it returns true. If it does not exist, it returns false; from another angle. It can also be used to detect whether all the elements in the array do not meet the specified conditions. If none of them meet the specified conditions, false is returned. If there are one or more matches, true is returned.

The operating environment of this tutorial: windows7 system, ECMAScript version 6, Dell G3 computer.

The some () method can be used to detect whether the element in the array meets the specified condition (provided by the function), returning true if it exists and false if it does not exist. Some () returns true as long as one element in the array satisfies the condition.

On the other hand, some () can also be used to check whether all the elements in the array do not meet the specified conditions, returning false if none of them match, and true if there are one or more matches.

Array.some (function callbackfn (Value,index,array), thisValue)

Array: required parameter, an array object.

Function callbackfn (value,index,array): a callback function with required parameters, which can accept up to three parameters:

The some () method calls the callbackfn function for each element in array until callbackfn returns true, or until the end of the array is reached.

Value: the value of the current array element, which cannot be omitted.

Index: the numeric index of the current array elements.

Array: the array object to which the current element belongs.

ThisArg: an optional parameter for which the this keyword can be referenced in the callbackfn function. If thisArg is omitted, undefined is used as the return false.

The song () method calls the callbackfn function on each array element in ascending indexing order until the callbackfn function returns true. If the element that causes callbackfn to return true is found, the some () method returns true immediately. If the callback does not return true for any element, the some () method returns false.

The some () method does not call the callback function for missing elements in the array. Except for array objects, the some () method can be used by any object that has a length property and has a numerically indexed property name, such as an associative array, Arguments, and so on.

Example: check whether the values of the elements in the array are all odd

If the some () method detects an even number, it returns true and indicates that it is not all odd; if no even number is detected, it indicates that it is all odd.

Function f (value, index, ar) {if (value% 2 = = 0) {return true;}} var a = [1m15, 4, 10, 10 and 11]; var evens = a.some (f); if (evens) {console.log ("not all odd"). ;} else {console.log ("all odd.") ;} these are the functions of the es6 some method shared by the editor. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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