Ios – warning: ‘characters’ is deprecated: Please use String or Substring directly

iosstringsubstringswift4xcode9.1

characters – an instance property of String, is deprecated from with Xcode 9.1

It was very useful to get a substring from String by using the characters property but now it has been deprecated and Xcode suggests to use substring. I've tried to check around SO questions and apple developer tutorials/guidelines for the same. But could not see any solution/alternate as suggested.

Here is warning message:

'characters' is deprecated: Please use String or Substring

I've so many string operations are performed/handled using property characters.

Anyone have any idea/info about this update?

Best Answer

Swift 4 introduced changes on string API.
You can just use !stringValue.isEmpty instead of stringValue.characters.count > 0

for more information you get the sample from here

for e.g

let edit = "Summary"
edit.count   // 7

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Bash – How to check if a string contains a substring in Bash

You can use Marcus's answer (* wildcards) outside a case statement, too, if you use double brackets:

string='My long string'
if [[ $string == *"My long"* ]]; then
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fi

Note that spaces in the needle string need to be placed between double quotes, and the * wildcards should be outside. Also note that a simple comparison operator is used (i.e. ==), not the regex operator =~.

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>>> x = "Hello World!"
>>> x[2:]
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>>> x[:2]
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>>> x[:-2]
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>>> x[-2:]
'd!'
>>> x[2:-2]
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Python calls this concept "slicing" and it works on more than just strings. Take a look here for a comprehensive introduction.

Best Answer

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Bash – How to check if a string contains a substring in Bash

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