Opposite of push(); [duplicate]

问题

I need help on this problem - 'What is the opposite of the JavaScript push(); method?'

Like say I had a array -

var exampleArray = ['remove'];

I want to push(); the word 'keep' -

exampleArray.push('keep');

How do I delete the string 'remove' from the array?

回答1:

Well, you've kind of asked two questions. The opposite of push() (as the question is titled) is pop().

var exampleArray = ['myName'];
exampleArray.push('hi');
console.log(exampleArray);

exampleArray.pop();
console.log(exampleArray);

pop() will remove the last element from exampleArray and return that element ("hi") but it will not delete the string "myName" from the array because "myName" is not the last element.

What you need is shift() or splice():

var exampleArray = ['myName'];
exampleArray.push('hi');
console.log(exampleArray);

exampleArray.shift();
console.log(exampleArray);

var exampleArray = ['myName'];
exampleArray.push('hi');
console.log(exampleArray);

exampleArray.splice(0, 1);
console.log(exampleArray);

For more array methods, see: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array#Mutator_methods

回答2:

push() adds at end; pop() deletes from end.

unshift() adds to front; shift() deletes from front.

splice() can do whatever it wants, wherever it wants.

来源：https://stackoverflow.com/questions/25517633/opposite-of-push

标签

javascript

arrays

push