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Questions and Answers
What is the index of the first element in an array?
What is the index of the first element in an array?
- 1
- 0 (correct)
- -1
- None of the above
What is the purpose of the Array object when declaring an array?
What is the purpose of the Array object when declaring an array?
- To create an array with a specific data type
- To initialize an empty array
- To create a multidimensional array
- To specify the length of the array (correct)
What is the difference between var a_ary = ['a', 'b', 'c']; and var a_ary = new Array('a', 'b', 'c');?
What is the difference between var a_ary = ['a', 'b', 'c']; and var a_ary = new Array('a', 'b', 'c');?
- The first one creates an array, the second one creates a string
- The first one creates a string, the second one creates an array
- There is no difference, both create an array (correct)
- The first one creates a sparse array, the second one creates a dense array
What is the output of console.log(a_ary.length);?
What is the output of console.log(a_ary.length);?
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What is the purpose of the length property of an array?
What is the purpose of the length property of an array?
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What happens when you use Array.prototype.unshift() on an array?
What happens when you use Array.prototype.unshift() on an array?
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What is the difference between Array.prototype.shift() and Array.prototype.pop()?
What is the difference between Array.prototype.shift() and Array.prototype.pop()?
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What is the purpose of the Array.prototype.splice() method?
What is the purpose of the Array.prototype.splice() method?
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What is the return value of the Array.prototype.shift() method?
What is the return value of the Array.prototype.shift() method?
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What happens when you use Array.prototype.push() on an array?
What happens when you use Array.prototype.push() on an array?
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