How to use slice method and join method in javascript array
Xiaobian to share with you how to use the slice method and join method in javascript array, I believe most people do not know how to use it, so share this article for your reference, I hope you have a lot of harvest after reading this article, let's go to understand it together!
1. slice method 1 editor section
2 Code parts map const geyao=["geyao","geyao1","geyao2"]//Required. Specify where to start selecting. If negative, it specifies the position from the end of the array. That is,//-1 refers to the last element,-2 refers to the penultimate element, and so on.// Optional. Specify where the selection ends. This parameter is the array index at the end of the array fragment. If this parameter is not specified,//then the split array contains all elements from start to end of the array. If this argument is negative, then it specifies elements counting from the end of the array.// The first is the start index and the second is the end index//(leaving the original array unchanged) let geyao1=geyao.slice(1,3) console.log(geyao,"later") console.log(geyao1,"later") //where to start let geyao2=geyao.slice(1) console.log(geyao,"later") console.log(geyao1,"later")3 Run results
Summary:
Required. Specify where to start selecting. If negative, it specifies the position from the end of the array. That is,-1 refers to the last element,-2 refers to the penultimate element, and so on. Optional. Specify where the selection ends. This parameter is the array index at the end of the array fragment. If this parameter is not specified, the partitioned array contains all elements from the start to the end of the array. If this argument is negative, then it specifies elements counting from the end of the array. The first is the start index and the second is the end index (leaving the original array unchanged).
2. Join Method 1 Editor
2 Code parts var elements ="'ballad ','very strong',' excellent'"]; console.log (elements.join()); console.log (elements.join ('')); console.log (elements.join ('-'));3 Run results
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