Tons of Solutions Engineering work done today for the rest of the CS team! Headway, Howard Hanna, Engels, Brighton, etc. Also completed Datasnippers auth flow and worked on Anthology's script. Cloned Anthology's courses (900..) and will clone Full Story on Monday.

Scripts/node_modules/fast-fifo/index.js

@@ -0,0 +1,48 @@
+const FixedFIFO = require('./fixed-size')
+
+module.exports = class FastFIFO {
+  constructor (hwm) {
+    this.hwm = hwm || 16
+    this.head = new FixedFIFO(this.hwm)
+    this.tail = this.head
+    this.length = 0
+  }
+
+  clear () {
+    this.head = this.tail
+    this.head.clear()
+    this.length = 0
+  }
+
+  push (val) {
+    this.length++
+    if (!this.head.push(val)) {
+      const prev = this.head
+      this.head = prev.next = new FixedFIFO(2 * this.head.buffer.length)
+      this.head.push(val)
+    }
+  }
+
+  shift () {
+    if (this.length !== 0) this.length--
+    const val = this.tail.shift()
+    if (val === undefined && this.tail.next) {
+      const next = this.tail.next
+      this.tail.next = null
+      this.tail = next
+      return this.tail.shift()
+    }
+
+    return val
+  }
+
+  peek () {
+    const val = this.tail.peek()
+    if (val === undefined && this.tail.next) return this.tail.next.peek()
+    return val
+  }
+
+  isEmpty () {
+    return this.length === 0
+  }
+}