How to insert a string in a string specified position by JS

js insert string at specified position of string

Using stringsslicemethod

Definition and usage

The slice(start, end) method extracts a part of the string and returns the extracted part as a new string.
Use start(Include) and end(Not included) parameter to specify the part of the string extract.

parameter	describe
start	must. The first character position is 0 for the starting subscript of the segment to be intercepted. If it is a negative number, it starts to intercept from the tail.
end	Optional. The subscript at the end of the segment to be captured immediately. If this parameter is not specified, the substring to be extracted includes a string from start to the end of the original string. If the parameter is a negative number, it specifies the position from the end of the string. slice(-2) means to extract the penultimate element in the original array to the last element (including the last element).

parameter

describe

start

must. The first character position is 0 for the starting subscript of the segment to be intercepted. If it is a negative number, it starts to intercept from the tail.

end

Optional. The subscript at the end of the segment to be captured immediately. If this parameter is not specified, the substring to be extracted includes a string from start to the end of the original string. If the parameter is a negative number, it specifies the position from the end of the string. slice(-2) means to extract the penultimate element in the original array to the last element (including the last element).

The code is as follows:

// souece The original string start position to be intercepted newStr character to be insertedinsertStr(source, start, newStr) {
	return (0, start) + newStr + (start)
}
// use('20220808', 4, '-') // 2020-0808

Supplement: js insert strings with specified positions for strings

js Insert strings at a specified location for strings

//use('202005',4,'/')
====================
//method://soure original string//start location//newStr String to be insertedinsertStr(soure, start, newStr){   
  return (0, start) + newStr + (start);
},
====================
//result2020/05

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