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I need to copy one array and remove the element, but only from second array?
for example:
var m1 = [ "a","b","c","d"];
var m2 = m1;
alert(m1+' and '+m2); // "a b c d" and "a b c d"
m2.splice(0,1); // b c d
alert(m1 + ' and ' + m2); // b c d and b c d
so the first element from each of these arrays was removed, but how to leave the 1st array static?
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For removing one array from another array in java we will use the removeAll() method. This will remove all the elements of the array1 from array2 if we call removeAll() function from array2 and array1 as a parameter.
To remove one or more elements from an array, use the splice() method. The splice method changes the contents of the original array by removing, replacing or adding new elements and returns an array containing the removed elements.
Once an array is created, its size cannot be changed. If you want to change the size, you must create a new array and populates it using the values of the old array. Arrays in Java are immutable. To add or remove elements, you have to create a new array.
pop() function: This method is use to remove elements from the end of an array. shift() function: This method is use to remove elements from the start of an array. splice() function: This method is use to remove elements from the specific index of an array.
Use slice() to copy the values to the new array:
var m2 = m1.slice(0);
Use Array.prototype.slice to copy arrays:
var m2 = m1.slice();
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