I'm currently working on creating custom functions for common array operations. I've hit a roadblock trying to reimplement the shift method without using splice. Any tips or guidance on how to approach this challenge would be highly valued.
CustomShift = function (arr) {
for (let i = 0; i < arr.length - 1; i++) {
arr[i] = arr[i + 1];
}
arr.length--;
};
One issue arises from the iterative process where the value at i is replaced with i+1 and then moves backwards, resulting in all positions being assigned the last value.
MyShift = function(array) {
for (var i = 0; i < array.length - 1; i++) {
array[i] = array[i + 1];
};
--array.length;
};
var a = ['a', 'b', 'c'];
MyShift(a);
document.body.appendChild(document.createTextNode(a))During the first iteration, i=1, and thus array[1] = array[2], resulting in [a, c, c]. Subsequent iteration with i=0 leads to array[0] = array[1]. Since the previous iteration updated the value of array[1], the final array becomes [c, c, c].
MyShift = function(array) {
snippet.log('src: ' + array)
for (i = array.length - 2; i >= 0; i--) {
array[i] = array[i + 1];
snippet.log('loop ' + i + ': ' + array);
}
--array.length;
};
var a = ['a', 'b', 'c'];
MyShift(a);
snippet.log('Result: ' + a)<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- Provides the `snippet` object, see http://meta.stackexchange.com/a/242144/134069 -->
<script src="http://tjcrowder.github.io/simple-snippets-console/snippet.js"></script>If you want to achieve this, you can utilize the Array.prototype.shift() function.
By using this method, you can eliminate the first element from an array and receive that specific element in return. It's important to note that this action will affect the length of the array.
If you follow these steps, you can achieve a similar outcome.
ShiftElements = function (arr) {
for (j = 0; j<arr.length; j++) {
arr[j] = arr[j + 1];
console.log(arr[j]);
}
--arr.length;
return(arr);
};
ShiftElements([5, 6, 7, 8]);
Hopefully, this solution proves to be useful.
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