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For example, str = 'abcdefg'. How do I find the index if c in this string using Ruby?
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The indexOf() method returns the position of the first occurrence of specified character(s) in a string. Tip: Use the lastIndexOf method to return the position of the last occurrence of specified character(s) in a string.
There is no substring method in Ruby, and hence we rely upon ranges and expressions. If we want to use the range, we have to use periods between the starting and ending index of the substring to get a new substring from the main string.
index is a String class method in Ruby which is used to returns the index of the first occurrence of the given substring or pattern (regexp) in the given string. It specifies the position in the string to begin the search if the second parameter is present.
index(substring [, offset]) → fixnum or nil index(regexp [, offset]) → fixnum or nil Returns the index of the first occurrence of the given substring or pattern (regexp) in str. Returns nil if not found. If the second parameter is present, it specifies the position in the string to begin the search.
"hello".index('e') #=> 1 "hello".index('lo') #=> 3 "hello".index('a') #=> nil "hello".index(?e) #=> 1 "hello".index(/[aeiou]/, -3) #=> 4 Check out ruby documents for more information.
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You can use this
"abcdefg".index('c') #=> 2 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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