53 lines
829 B
JavaScript
53 lines
829 B
JavaScript
return {
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make: make,
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vertical: vertical,
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horizontal: horizontal,
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diagonal: diagonal,
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zero: zero,
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plus: plus,
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opposite: opposite,
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isSmaller: isSmaller,
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key: key,
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ofKey: ofKey
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};
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function make(row, column) {
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return {row: row, column: column};
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}
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function zero() {
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return make(0, 0);
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}
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function vertical(length) {
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return make(length, 0);
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}
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function horizontal(length) {
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return make(0, length);
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}
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function diagonal(length) {
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return make(length, length);
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}
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function plus(v0, v1) {
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return {row: v0.row + v1.row, column: v0.column + v1.column};
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}
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function opposite(v) {
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return {row: -v.row, column: -v.column};
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}
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function isSmaller(v0, v1) {
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return v0.row <= v1.row && v0.column <= v1.column;
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}
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function key(v) {
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return v.row + ':' + v.column;
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}
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function ofKey(k) {
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return make.apply(null, k.split(':'));
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}
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