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array.ts
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211 lines (181 loc) · 4.81 KB
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Array.prototype.at = function (index) {
if (index < 0) {
const length = this.length
return this[length + index];
}
return this[index];
}
Array.prototype.map = function (f) {
const res: any[] = []
const length = this.length
for (let i = 0; i < length; ++i) {
res.push(f(this[i], i, this))
}
return res
}
Array.prototype.forEach = function (f) {
const length = this.length
for (let i = 0; i < length; ++i) {
f(this[i], i, this)
}
}
Array.prototype.find = function (f) {
const length = this.length
for (let i = 0; i < length; ++i) {
if (f(this[i], i, this)) return this[i]
}
return undefined
}
Array.prototype.findIndex = function (f) {
const length = this.length
for (let i = 0; i < length; ++i) {
if (f(this[i], i, this)) return i
}
return -1
}
Array.prototype.findLast = function (f) {
const length = this.length;
for (let i = length - 1; i >= 0; i--) {
if (f(this[i], i, this)) return this[i]
}
return undefined;
}
Array.prototype.findLastIndex = function (f) {
const length = this.length
for (let i = length - 1; i >= 0; i--) {
if (f(this[i], i, this)) return i
}
return -1
}
Array.prototype.filter = function (f) {
const res: any[] = []
const length = this.length
for (let i = 0; i < length; ++i) {
if (f(this[i], i, this)) res.push(this[i])
}
return res
}
Array.prototype.every = function (f) {
const length = this.length
for (let i = 0; i < length; ++i) {
if (!f(this[i], i, this)) return false
}
return true
}
Array.prototype.fill = function (value, start, end) {
const length = this.length
let startIndex = start ?? 0
if (startIndex < -length) {
startIndex = 0
}
if (startIndex < 0) {
startIndex = startIndex + length
}
let endIndex = end ?? length
if (endIndex >= length ) {
endIndex = length
}
if (endIndex < 0) {
endIndex = endIndex + length
}
if (endIndex < -length) {
endIndex = 0
}
for (let i = startIndex; i < endIndex; ++i) {
this[i] = value;
}
return this;
}
Array.prototype.some = function (f) {
const length = this.length
for (let i = 0; i < length; ++i) {
if (f(this[i], i, this)) return true
}
return false
}
Array.prototype.includes = function (el, fromIndex) {
const length = this.length
const start = fromIndex || 0
for (let i = start; i < length; ++i) {
if (el === this[i]) return true
}
return false
}
Array.prototype.pop = function () {
const length = this.length - 1
if (length < 0) return undefined
const r = this[length]
this.insert(length, -1)
return r
}
Array.prototype.shift = function () {
if (this.length === 0) return undefined
const r = this[0]
this.insert(0, -1)
return r
}
Array.prototype.unshift = function (...elts: any[]) {
this.insert(0, elts.length)
for (let i = 0; i < elts.length; ++i) this[i] = elts[i]
return this.length
}
Array.prototype.indexOf = function (elt, from) {
const length = this.length
if (from == undefined) from = 0
while (from < length) {
if (this[from] === elt) return from
from++
}
return -1
}
Array.prototype.lastIndexOf = function (elt, from) {
if (from == undefined) from = this.length - 1
while (from >= 0) {
if (this[from] === elt) return from
from--
}
return -1
}
Array.prototype.reduce = function (callbackfn: any, initialValue: any) {
const len = this.length
for (let i = 0; i < len; ++i) {
initialValue = callbackfn(initialValue, this[i], i)
}
return initialValue
}
Buffer.prototype.set = function (other: Buffer, trgOff?: number) {
if (!trgOff) trgOff = 0
this.blitAt(trgOff, other, 0, other.length)
}
Buffer.prototype.concat = function (other: Buffer) {
const r = Buffer.alloc(this.length + other.length)
r.set(this)
r.set(other, this.length)
return r
}
Buffer.prototype.slice = function (start?: number, end?: number) {
if (end === undefined) end = this.length
if (start === undefined) start = 0
const len = end - start
if (len <= 0 || start >= this.length) return Buffer.alloc(0)
const r = Buffer.alloc(len)
r.blitAt(0, this, start, len)
return r
}
Buffer.concat = function (...buffers: Buffer[]) {
let size = 0
for (const b of buffers) {
size += b.length
}
const r = Buffer.alloc(size)
size = 0
for (const b of buffers) {
r.blitAt(size, b, 0, b.length)
size += b.length
}
return r
}
Buffer.prototype.lastIndexOf = function (byte, startOffset, endOffset) {
if (endOffset == undefined) endOffset = this.length
return this.indexOf(byte, startOffset, -endOffset)
}