用JavaScript中的.splice（）替换多个元素

Question

I am pretty new to Javascript and i am doing a course on it atm. I am searching for a way to replace multiple items in an array with 1 item but i only know how to replace a single one.here is my snipped:

 let secretMessage = ["Learning", "isn't", "about", "what", "you", "get", "easily", "the", "first", "time,", "it's", "about", "what", "you", "can", "figure", "out.", "-2015,", "Chris", "Pine,", "Learn", "JavaScript"]; secretMessage.pop(); secretMessage.push('to','program'); secretMessage[6] = 'right'; secretMessage.shift(); secretMessage.unshift('Programming'); 

and this is what i am supposed to do: Use an array method to remove the strings get, right, the, first, time,, and replace them with the single string know,.

Answer 1

The .splice() method lets you replace multiple elements in an array with one, two, or however many elements you like. Just use the syntax:

.splice(startingIndex, numDeletions, replacement1, replacement2, ... )

where:

• startingIndex is the index of the array that contains the first element you want to remove
• numDeletions is the number of consecutive items in the array you want to remove
• replacement1 , replacement2 , ... (however many) are the elements you wish to add to the array, beginning at startingIndex

In your case:

• get is at index 5
• get , easily , the , first , time is 5 Strings consecutively
• only want one replacement: the String know

So you would say .splice(5, 5, "know")

Can also refer to MDN here . Cheers!

Answer 2

Thank you so much!but could you give me an example with items not in a row for example 5 7 9 and more than on replacement-word? would it be something like this :

.splice(5, 1, "know";2,1,"tomatoe";6,1,"cheese") ?