adding to fundamentals

Author: aofengen

Array_concat.js

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+let x = [1, 4, 7];
+let y = [2, 3, 5, 6];
+
+let z = x.concat(y);
+
+console.log(z);
+//[ 1, 4, 7, 2, 3, 5, 6 ]

Array_copyWithin.js

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+let x = [2,3,5,6];
+
+//x.copyWithin(1,0);
+// /[ 2, 2, 3, 5 ]
+
+//x.copyWithin(2,0);
+//[ 2, 3, 2, 3 ]
+
+console.log(x);

Array_entries.js

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+let x = [0, 1, 2, 3];
+let y = x.entries();
+
+console.log(y.next().value); //[0,0]
+console.log(y.next().value); //[1,1]
+console.log(y.next().value); //[2,2]
+console.log(y.next().value); //[3,3]
+
+//Array.entries returns all index/value pairs of an array as an object. next().value must be used to display each index/value
+//pair out of the object. Each next.value displays the next successive index/value pair.

Array_every.js

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+let x = [1, 2, 3, 4, 5];
+let y = [-1, 2, 3, 4, 5];
+
+function positiveNumbers(element, index, array) {
+	return element >= 0
+}
+
+console.log(x.every(positiveNumbers)); //true. All elements of array x are positive numbers.
+console.log(y.every(positiveNumbers)); //false. Not all elements of array y are positive numbers.

Array_fill.js

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+let x = [1, 2, 3, 4, 5]
+
+console.log(x.fill(1)); //[ 1, 1, 1, 1, 1 ]
+console.log(x.fill(3)); //[ 3, 3, 3, 3, 3 ]
+console.log(x.fill("a")); //[ 'a', 'a', 'a', 'a', 'a' ]
+
+let y = ["b", "c", "d"];
+
+console.log(y.fill("z")); //[ 'z', 'z', 'z' ]

Array_filter.js

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+let x = [1,3,7,10,15,46];
+
+let y = x.filter(function(number) {
+	return number > 8;
+});
+
+console.log(y); //[ 10, 15, 46 ]
+
+let z = x.filter(function(number) {
+	return number > 1;
+});
+
+console.log(z); //[ 3, 7, 10, 15, 46 ]
+
+//ES6 - Arrow function
+let a = x.filter(number => number > 8);
+console.log(a); //[ 10, 15, 46 ]

Array_forEach.js

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+let x = [1,2,3];
+
+x.forEach(function(number) {
+	console.log(number);
+});
+//1
+//2
+//3
+
+x.forEach(function(number) {
+	console.log(number += 1);
+})
+// 2
+// 3
+// 4

Array_from.js

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+let x = [1, 2, 3];
+
+console.log(Array.from(x));
+
+console.log(Array.from("hello"));

Array_includes.js

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+let x = [1,2,3,4,5];
+
+console.log(x.includes(1)); //true
+console.log(x.includes(7)); //false

Array_isArray.js

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+let x = [1,4,5,7];
+
+console.log(Array.isArray(x)); //true
+
+console.log(Array.isArray(3)); //false

Array_join.js

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+let x = ["x", "y", "z"];
+
+console.log(x.join()); //x,y,z
+console.log(x.join('-')); //x-y-z
+console.log(x.join('/')); //x/y/z
+
+//returns string of array elements separated by parameter supplied in join method ("," if left blank)

Array_map.js

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+let x = [1,2,3];
+x.concat(x);
+
+let y = x.map(function(z) {
+	return z * 2;
+});
+
+console.log(y); //[ 2, 4, 6 ]
+
+let z = x.map(array => array * 3);
+console.log(z); //[ 3, 6, 9 ]

Array_of.js

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+console.log(Array.of(1,4,"12", "seventeen"));
+//[ 1, 4, '12', 'seventeen' ]

Array_sort.js

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+let x = [1, 4, 7];
+let y = [2, 3, 5, 6];
+
+let z = x.concat(y);
+//[ 1, 4, 7, 2, 3, 5, 6 ]
+
+console.log(z.sort());
+//[ 1, 2, 3, 4, 5, 6, 7 ]

Datetest.js

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+let x = Date()
+console.log(x)
+x = x.slice(0,x.indexOf('G')).trimRight()
+
+console.log(x)
+