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72 lines
2.0 KiB
72 lines
2.0 KiB
4 years ago
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## A winning argument
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### Arguments
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We mentioned it before with methods, functions can take arguments. They are
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always in between parens `()`.
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Let's use the same examples that we used for function calls:
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Remember this example of function call?:
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```js
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// ↙ method
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console.log('Hello There !') //<-
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// ↖ The String 'Hello There!' is
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// the argument of console.log()
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```
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or these ones?:
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```js
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let roundedValue = Math.round(1.8) // The number 1.8 is the arg
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console.log(roundedValue) // the variable roundedValue is the arg
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```
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We are now going to adapt `myFirstFuntion` so that it takes one argument :
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`arg1`.
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```js
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let myFirstFunction = (arg1) => {
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//<-arg1 is inputed in between the parens
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console.log(arg1) // arg1 can be use inside the scope of the function
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// ↖ arg1 is "transfered" to be the arg of console.log()
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} //<-end of the scope of the function
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```
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Now the function if called, display the output the `console.log(arg1)`.
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```js
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myFirstFunction('using my first arg') // "using my first arg"
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```
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But let's say we want to change what the function logs. Now, instead of
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modifying `myFirstFunction` we just need to modify the argument in the function
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call.
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```js
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myFirstFunction('another arg') // "another arg"
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myFirstFunction('and another one') // "and another one"
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myFirstFunction('and one more') // "and one more"
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```
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> waste no more time arguing about what a good man should be. Be one.
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>
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> - Marcus Aurelius
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### Instructions
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You are a general's aide who has to transmit the communications to the other
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soldiers.
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In order to do so you will create the function `battleCry`. This function will
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take one argument and will display it in the console.
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The battlefield is big so make sure that the argument is uppercased before
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displaying it.
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Now, sometimes the communications will have to given quietly.
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For this you will create the function `secretOrders` which does the same as
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`battleCry` except that it lowercases the argument before sending it.
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