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docs: update
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README.md
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README.md
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@ -71,6 +71,7 @@ See something incorrectly described, buggy or outright wrong? Open an issue or s
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* [ARITHMETIC](#arithmetic-1)
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* [Ternary Tests](#ternary-tests)
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* [Check if a number is a float](#check-if-a-number-is-a-float)
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* [Check if a number is an integer](#check-if-a-number-is-an-integer)
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* [TRAPS](#traps)
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* [Do something on script exit](#do-something-on-script-exit)
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* [Ignore terminal interrupt (CTRL+C, SIGINT)](#ignore-terminal-interrupt-ctrlc-sigint)
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@ -817,15 +818,30 @@ is_float() {
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return 1
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}
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```
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## Check if a number is an integer
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**Example Function:**
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```sh
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is_int() {
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# usage: is_int "number"
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case $1 in
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*[!-0-9]*|'') return 1 ;;
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*[0-9]*)
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esac
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}
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```
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**Example Usage:**
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```shell
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$ is_float 1.1 && echo true
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true
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$ is_int 1 && echo true
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$ true
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$ is_float 1 && echo true
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$ is_int 1.1 && echo true
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$
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```
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