How to use concat method and splice method in javascript array

This article is about how to use the concat method and the splice method in javascript arrays. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

First, concat method 1 directly vs open

2 Code block / / function: merge arrays, merge one or more arrays, return the data after merging arrays without changing the original array; const geyao = ['ballad'] const fuzhu= ["very strong"] console.log (geyao.concat (fuzhu)); console.log (geyao); 3 run results

Summary:

Function: merge arrays, can merge one or more arrays, will return the data after the merged array, will not change the original array

2. Splice method 1 code part const geyao= ["ballad", "very strong", "very handsome"] / / delete 1 element from index 1 let b=geyao.splice (1p1) console.log (b, "later") console.log (geyao, "geyao1") / / from index 2 / delete 0 elements / / then insert "very strong" and "very show" geyao.splice ("very strong", "very strong") "Great") console.log (geyao, "geyao1") / / replace operation: when performing a replace operation The second parameter is the number of elements to be replaced, followed by the deleteCount elements to be replaced. Geyao.splice (2Jing 2, "very impressive", "very nice") console.log (geyao, "geyao1") 2 run result

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