डेल्टा के साथ
जावास्क्रिप्ट के लिए
Array.from(Array(10).keys()).map(i => 4 + i * 2);
//=> [4, 6, 8, 10, 12, 14, 16, 18, 20, 22]
[...Array(10).keys()].map(i => 4 + i * -2);
//=> [4, 2, 0, -2, -4, -6, -8, -10, -12, -14]
Array(10).fill(0).map((v, i) => 4 + i * 2);
//=> [4, 6, 8, 10, 12, 14, 16, 18, 20, 22]
Array(10).fill().map((v, i) => 4 + i * -2);
//=> [4, 2, 0, -2, -4, -6, -8, -10, -12, -14]
[...Array(10)].map((v, i) => 4 + i * 2);
//=> [4, 6, 8, 10, 12, 14, 16, 18, 20, 22]
const range = (from, to, step) =>
Array(~~((to - from) / step) + 1) // '~~' is Alternative for Math.floor()
.fill().map((v, i) => from + i * step);
range(0, 9, 2);
//=> [0, 2, 4, 6, 8]
Array.range = (from, to, step) => Array.from({
length: ~~((to - from) / step) + 1
},
(v, k) => from + k * step
);
Array.range = (from, to, step) => [...Array(~~((to - from) / step) + 1)].map(
(v, k) => from + k * step
)
Array.range(2, 10, 2);
//=> [2, 4, 6, 8, 10]
Array.range(0, 10, 1);
//=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Array.range(2, 10, -1);
//=> []
Array.range(3, 0, -1);
//=> [3, 2, 1, 0]
class Range {
constructor(total = 0, step = 1, from = 0) {
this[Symbol.iterator] = function*() {
for (let i = 0; i < total; yield from + i++ * step) {}
};
}
}
[...new Range(5)]; // Five Elements
//=> [0, 1, 2, 3, 4]
[...new Range(5, 2)]; // Five Elements With Step 2
//=> [0, 2, 4, 6, 8]
[...new Range(5, -2, 10)]; // Five Elements With Step -2 From 10
//=>[10, 8, 6, 4, 2]
[...new Range(5, -2, -10)]; // Five Elements With Step -2 From -10
//=> [-10, -12, -14, -16, -18]
// Also works with for..of loop
for (i of new Range(5, -2, 10)) console.log(i);
// 10 8 6 4 2
// Or
const Range = function*(total = 0, step = 1, from = 0){
for (let i = 0; i < total; yield from + i++ * step) {}
};
Array.from(Range(5, -2, -10));
//=> [-10, -12, -14, -16, -18]
[...Range(5, -2, -10)]; // Five Elements With Step -2 From -10
//=> [-10, -12, -14, -16, -18]
// Also works with for..of loop
for (i of Range(5, -2, 10)) console.log(i);
// 10 8 6 4 2
class Range2 {
constructor(to = 0, step = 1, from = 0) {
this[Symbol.iterator] = function*() {
let i = 0,
length = ~~((to - from) / step) + 1;
while (i < length) yield from + i++ * step;
};
}
}
[...new Range2(5)]; // First 5 Whole Numbers
//=> [0, 1, 2, 3, 4, 5]
[...new Range2(5, 2)]; // From 0 to 5 with step 2
//=> [0, 2, 4]
[...new Range2(5, -2, 10)]; // From 10 to 5 with step -2
//=> [10, 8, 6]
// Or
const Range2 = function*(to = 0, step = 1, from = 0) {
let i = 0, length = ~~((to - from) / step) + 1;
while (i < length) yield from + i++ * step;
};
[...Range2(5, -2, 10)]; // From 10 to 5 with step -2
//=> [10, 8, 6]
let even4to10 = Range2(10, 2, 4);
even4to10.next().value
//=> 4
even4to10.next().value
//=> 6
even4to10.next().value
//=> 8
even4to10.next().value
//=> 10
even4to10.next().value
//=> undefined
टाइपस्क्रिप्ट के लिए
interface _Iterable extends Iterable < {} > {
length: number;
}
class _Array < T > extends Array < T > {
static range(from: number, to: number, step: number): number[] {
return Array.from(
( < _Iterable > { length: Math.floor((to - from) / step) + 1 }),
(v, k) => from + k * step
);
}
}
_Array.range(0, 9, 1);
//=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
अपडेट करें
class _Array<T> extends Array<T> {
static range(from: number, to: number, step: number): number[] {
return [...Array(~~((to - from) / step) + 1)].map(
(v, k) => from + k * step
);
}
}
_Array.range(0, 9, 1);
संपादित करें
class _Array<T> extends Array<T> {
static range(from: number, to: number, step: number): number[] {
return Array.from(Array(~~((to - from) / step) + 1)).map(
(v, k) => from + k * step
);
}
}
_Array.range(0, 9, 1);