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The filter() traverses the array, which is extremely friendly

2022-04-23 13:05:00 【It's never too late to be alone】

filter() Method to create a new array , The elements in the new array are checked by checking all the eligible elements in the specified array .

  • Be careful ： filter() Empty arrays are not detected .
  • Be careful ： filter() It doesn't change the original array .

Usage is as follows ：

var a = [
	{
    name:' cockroach ',texts:' mathematics '},
	{
    name:' cockroach 1',texts:' mathematics 1'},
	{
    name:' cockroach ',texts:' mathematics 2'},
	{
    name:' cockroach 2',texts:' mathematics 3'}
	];
	var b = [];
	function text(age){
    
		return age.name === ' cockroach '
	}
	b = a.filter(text);
	console.log(b);
	console.log(a);

result ：
Insert picture description here

  • Personal opinion ： When the current backend interacts ,filter(） Method is very convenient to process data .

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