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DAD
Asked: 2020-08-01 22:35:41 +0800 CST 2020-08-01 22:35:41 +0800 CST

how to extract values ​​from an array?

  • 772

Well, I'm using something like a calculation library jsthat I found, in this case I want to do something like a multiplication where they ask me for twoparámetros (factor, valores_n)

where what I would do would be something like this:

enter image description here

So this is how I'm using it:

var multiplicacion = mult(factor , valores1 , ... valores_n)

factor= the multiplier

valores_n= the numbers I want to multiply

and the values ​​I want to multiply are inside a array,

var contenedor = [-5204.60, -3909.27, 2554.95 , 3390.40 ,  2567.15 , 3986.73]

then this method does not allow to enter the valores_nin arraythe values ​​must be so to speak "free".

target something like this:

var multiplicacion = mult(factor ,-5204.60, -3909.27, 2554.95 , 3390.40 ,  2567.15 , 3986.73)
javascript

2 Answers

  1. Best Answer

    You can use Function.prototype.apply( ):

    The method apply( )invokes a given function by explicitly assigning the object thisand an array or similar ( array like object ) as parameters (arguments) to that function.

    As this function only works with arrays , if you want to use a value not present in the array , you will have to add it by hand :

    var contenedor = [-5204.60, -3909.27, 2554.95 , 3390.40 ,  2567.15 , 3986.73];

contenedor.unshift( factor );

var multiplicacion = mult.apply( this, contenedor );

    If you can't modify the original container, you'll have to create another one.

    • 5

  2. You can use the operador de propagación, which saves you from fiddling with your array :

    The spread operator allows an expression to be expanded in situations where multiple arguments (function calls) or multiple elements (array literals) are expected.

    var contenedor = [-5204.60, -3909.27, 2554.95 , 3390.40 ,  2567.15 , 3986.73];

var multiplicacion = mult( factor, ...contenedor );
    • 5