List of helper functions

#repeatString repeats a string

repeatString string ?depth

depth >> how many times to repeat the string

repeatString "bash" 5

>>> bashbashbash

#charAt get the character position of a string

charAt string positionToSearch

charAt "bash" 2

>>> a

#includes check if a word is in a string

includes string stringToSearch ?depth

depth >> where to start search from

includes "bash" sh 2

returns 1 for false or 0 for true

#endsWith check if a word is the end in a string

endsWith string endToCheck ?depth

depth >>> where to start the search from

endsWith "bash" a 2

returns 1 for false or 0 for true

#isInteger check if a value is an integer

isInteger number

return 1 for non integers or 0 for integers

#int get all the integers before the decimal point non integers values will cause an error

int number

int 25.8

25

#destructure set the content of an array into different variables gotchas:- do not quote the array argument ( first agument ) it is important you quote the second argument to this function associative arrays work in alphabetical order use "," to separate the variables to assign each array element to

destrucutre array values

array=( bash ksh zsh )

destructre ${array[@]} "shell1,,shell2"

echo $shell1 > bash

echo $shell2 > zsh

destructure ${array[@]} "shell1,shell2,shell3"

echo $shell1 > bash

echo $shell2 > ksh

echo $shell3 > zsh

#... Spread a bunch of string inside an array

... string

str=bash

array=( $(... $str) )

echo ${str[@]}

>> b a s h

#foreach foreach element of an array execute a function gotchas: dont'quote the array arugment ( i.e the first agument ) If you pass in a function as the callback using the function command you should wrap it in single quotes

s() { echo $(( $1 * $1 )) ;}

array=( 1 2 3 4 5 6 )

foreach ${array[@]} s

>>> 2 4 6 8 10 12

foreach ${array[@]} 'function s() { echo $(( $1 + $1 )) ;}' >> always end the function with a ( ;} )

>>> 2 4 6 8 10 12

#copyWithin copy an array index into another index quote the first argument use ${array[*]} instead of ${array[@]}

copyWithin arrayArgument indexToCopyfrom indexToCopyTo

array=( "bash" "ksh" "zsh" "csh" )

copyWithin "${array[*]}" 1 3

bash ksh zsh ksh