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* chore: Switch to Node 20 + Vitest * chore: migrate to vitest mock functions * chore: code style (switch to prettier) * test: re-enable long-running test Seems the switch to Node 20 and Vitest has vastly improved the code's and / or the test's runtime! see #1193 * chore: code style * chore: fix failing tests * Updated Documentation in README.md * Update contribution guidelines to state usage of Prettier * fix: set prettier printWidth back to 80 * chore: apply updated code style automatically * fix: set prettier line endings to lf again * chore: apply updated code style automatically --------- Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com> Co-authored-by: Lars Müller <34514239+appgurueu@users.noreply.github.com>
53 lines
1.2 KiB
JavaScript
53 lines
1.2 KiB
JavaScript
// implementation of Queue using 2 stacks
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// contribution made by hamza chabchoub for a university project
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class Queue {
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constructor() {
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this.inputStack = []
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this.outputStack = []
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}
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// Push item into the inputstack
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enqueue(item) {
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this.inputStack.push(item)
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}
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dequeue() {
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// push all items to outputstack
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this.outputStack = []
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while (this.inputStack.length > 0) {
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this.outputStack.push(this.inputStack.pop())
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}
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// return the top element of the outputstack if any
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if (this.outputStack.length > 0) {
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const top = this.outputStack.pop()
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// repush all the items to the inputstack
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this.inputStack = []
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while (this.outputStack.length > 0) {
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this.inputStack.push(this.outputStack.pop())
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}
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return top
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}
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}
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// display elements of the inputstack
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listIn(output = (value) => console.log(value)) {
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let i = 0
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while (i < this.inputStack.length) {
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output(this.inputStack[i])
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i++
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}
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}
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// display element of the outputstack
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listOut(output = (value) => console.log(value)) {
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let i = 0
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while (i < this.outputStack.length) {
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output(this.outputStack[i])
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i++
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}
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}
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}
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export { Queue }
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