Type Conversion

Mission: Scoreboard Engine

A price arrives as text. Convert it before multiplying by the quantity so the total remains a number.

Sometimes you need to change a value from one type to another. JavaScript supports both explicit (manual) and implicit (automatic) type conversion.

Explicit conversion

Conversion	Method	Example	Result
To number	`Number()`	`Number("42")`	`42`
	`parseInt()`	`parseInt("3.9")`	`3`
	`parseFloat()`	`parseFloat("3.9")`	`3.9`
	Unary `+`	`+"42"`	`42`
To string	`String()`	`String(42)`	`"42"`
	`.toString()`	`(42).toString()`	`"42"`
To boolean	`Boolean()`	`Boolean(0)`	`false`

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Number("100")   // 100
Number("")      // 0
Number("abc")   // NaN
Number(true)    // 1
Number(false)   // 0
Number(null)    // 0

Boolean(0)        // false
Boolean("")       // false
Boolean(null)     // false
Boolean("hello")  // true
Boolean(1)        // true

Implicit conversion (coercion)

JavaScript automatically converts types in certain contexts — sometimes in surprising ways:

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"5" + 3      // "53"  — 3 converted to string
"5" - 3      // 2     — "5" converted to number
"5" * "3"    // 15    — both converted to numbers
true + 1     // 2     — true → 1
false + 1    // 1     — false → 0
null + 1     // 1     — null → 0
undefined + 1 // NaN

Your Task

Set priceStr to "29"; the provided probe will show priceStr: 29 (string).
Convert priceStr with Number() into price; the provided probe will show price: 29 (number).
Set quantity to 3; the provided probe will show quantity: 3.
Calculate total as price * quantity; the provided probe will show total: 87 (number).
Log Total: $87 using the numeric total.

Hint 1

1 / 3

HINT 1

Use Number() to convert a string to a number.

HINT 2

Use String() or template literals to convert a number to a string.

HINT 3

Use Boolean() to convert any value to true/false.

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READY

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